Summary
This one of my signature long and boring posts. Now that more than two people appear to be reading my blog, I decided to add a summary so they can move on to something more interesting in 30 seconds or less.
The Tax Policy Center published a report last summer that used Colorado, Minnesota, and New York state tax data to analyze TCJA’s effect on charitable giving. Robert McClelland, Using State-Level Data To Understand How The Tax Cuts And Jobs Act Affected Charitable Contributions, (July 2022) (11 pages); blog post summary. It shows that TCJA did, as expected, reduce charitable giving but the state data shows that the effect is quite a bit smaller than looking at federal tax data alone. Not surprisingly but still useful.
The report showed an unusual effect for two states – the 2018 drop in Minnesota giving was twice as big as in Colorado. I was intrigued and took up the author’s challenge to explore why Minnesota givers appear (probably mistakenly) to be twice as sensitive to tax incentives as Colorado givers. After spending a bunch of time looking for answers and coming up empty, I decided to wait for another year of data. That shows that the effect reversed with Minnesota giving for 2019 increasing quite bit and Colorado giving declining below Minnesota’s new level (measured relative to AGI). I don’t know what is going on, but my best guess (and that’s all it is) is that the 2018 Minnesota data are goofed up (technical term). But I don’t know why or have a good hypothesis for it.
This post is a tedious explanation of what I did, essentially writing up my research notes, a long, tortuous ride that ends in a box canyon with blank walls.
An addendum reprises my previous rants advocating for changes to Minnesota’s tax incentives for charitable giving after TCJA. That won’t happen because of institutional factors in how the legislature makes decisions on stuff like this but I can’t stop myself.
Introduction
TCJA, the 2017 federal tax cut, dramatically reduced the number of taxpayers who qualify for income tax incentives for charitable giving. It did so by simultaneously increasing the standard deduction and cutting back on itemized deductions (mainly for SALT, home equity interest, and employee business expenses). That means many fewer taxpayers now itemize deductions (about 10% versus close to 30% previously nationally), the main way charitable giving federal tax incentives are provided.
These new itemizers experience a higher after-tax price of charitable giving as a result. For example, an itemizer in the 25% bracket could give her favorite charity $1 at an after-tax cost of 75 cents. If she becomes a nonitemizer thanks to TCJA, the price rises to the full dollar contributed. Econ 101 predicts that increasing something’s price reduces the quantity purchased (gifts given here). But TCJA’s tax cuts provided potential givers with more income to make contributions. So, that could cause more giving. As with many tax changes, economic theory does not provide an unambiguous indication of the behavioral response that will occur. Standard contradictory substitution and income effects are at play.
One would expect the substitution effect to be more powerful with big price changes coupled with modest tax cuts. But that and the magnitude are empirical questions.
So far, researchers have relied on survey or federal income tax data. However, charitable contributions by newly nonitemizers will not show up on federal returns even though many still give. You don’t report contributions if you can’t deduct them. Survey data and reporting by nonprofits are less reliable ways to track charitable giving than contributions reported on tax returns. See this AEI Report, Howard Husack, The Tax Cuts and Jobs Act and Charitable Giving by Select High-Income Households (April 2022), for an example of an analysis that relies on income tax data; it assumes (more or less) that a reported decline in deductions equals a decline in charitable giving.
James Chandler, The Effect of the TCJA on Donations to Medical Charities (2021), uses a different type of tax data, contribution reports on Form 990s. Although medical charities (his focus) are required to 990s, a fair number of others (e.g., churches) are not and more importantly the characteristics of donors must be inferred (i.e., they are not reflected in the tax data).
Robert McClelland, a researcher at the Tax Policy Center, came up with a clever way to use state tax data from Colorado, Minnesota, and New York to assess the first-year effects of TCJA on charitable giving. Using State-Level Data To Understand How The Tax Cuts And Jobs Act Affected Charitable Contributions, (July 2022) (11 pages); blog post summary. Because these states continued to allow many of those who no longer itemize federally to deduct contributions for state tax purposes, they provide state tax data on giving behavior by these new nonitemizers. This was such a clever use of Minnesota tax data that I wish I had thought of it.
He found that:
[C]ontributions fell by much less than indicated on federal forms. In Colorado, a 16 percent decline measured at the federal level was in fact a 1 percent decline when contributions on state forms are included. In Minnesota, a 33 percent decline at the federal level was actually an 18 percent decline using combined federal and state data, and in New York, a 15 percent decline at the federal level was more likely a 4 percent decline. However, given 5.6 percent growth in AGI, the decline represents an even higher reduction in the rate of giving. Regardless, residents of these states retained some tax incentive to donate even as they switch from itemizing to not itemizing on their federal forms.
Robert McClelland, Using State-Level Data To Understand How The Tax Cuts And Jobs Act Affected Charitable Contributions, (July 2022), p. 9.
If you’re interested in the effects of TCJA’s changes on charitable giving, I recommend reading McClelland’s report or his blog post. It suggests TCJA’s effects on giving may not be as dire as a growing body of research seems to suggest (Google Scholar has a fair number of papers).
Colorado and Minnesota mystery
As is evident in McClelland’s quote above, the data show a big difference in the effects in Colorado (1% drop) compared to Minnesota (18% drop). McClelland notes:
We are unsure of the reasons for the large disparity between Colorado and Minnesota. State officials may know additional information about reporting incentives in those two years.
Id. p. 8
On the surface, that suggests that Minnesotans are more sensitive to charitable giving tax incentives than Coloradans. That is, TCJA’s tax price increase caused a much bigger decline in Minnesota giving. Both by filers who remain itemizers and by newly nonitemizers. That seems odd. The difference in response is so striking that I thought I would take up McClelland’s challenge.
One year of data for two states is a small sample, so I waited until the two states posted another year of data (2019 in addition to 2018) figuring that might help clarify matters. Instead, it reversed the effect, deepening the mystery. Colorado’s 2019 reported giving dipped, while Minnesota’s increased.
The rest of this post records my efforts. The short answer is that I don’t have a good explanation. But that won’t stop me from droning on about the blind alleys I explored.
Five avenues seemed to me worth exploring:
- TCJA’s differential effects
- State data differences
- State tax law differences
- Reporting differences
- Year-to-year variability or state differences in giving patterns
Differential TCJA effects on the two states
The first possibility that I looked at was whether TCJA’s itemized deduction changes affected the states differently. The big difference in itemized deduction amounts (33% drop for MN versus 16% for CO) suggested looking at that possibility. If TCJA caused a significantly higher proportion of Minnesotans to become standard deduction filers than in Colorado, that could account for some of the difference. That is so, because a higher proportion of Minnesotans would be subject to TCJA’s increased price of contributing than Coloradans. The graph shows the percentages of itemizers in Colorado and Minnesota for 2017 through 2020 using data from SOI Historic Table 2 (two more years of SOI data are available than CO and MN data).

It indicates there may be something to this. Pre-TCJA about two percentage points more resident Minnesota filers (35.5%) itemized than Colorado filers (33.6%). TCJA reversed that. In 2018, about two percentage points more resident Colorado filers (13.5%) itemized than Minnesota resident filers (11.3%). The effect persists in 2019 and 2020 (the further declines in 2020 may be pandemic effects).
As an aside, the likely explanation for that effect is that the SALT deduction cap adversely affected Minnesota filers more because of the state’s higher and more progressive taxes, which concentrate burdens on itemizers with their higher incomes. (If TCJA’s SALT cap was designed to punish high tax blue states, as I suggested here, it appears to have worked.) SALT deductions in 2017 were 6.6% of AGI in Minnesota versus on 4.4% in Colorado. Coloradans deducted one percentage point more of their AGI in mortgage interest (largely unaffected by TCJA) than Minnesotans, providing another part of the explanation.
That does mean that TCJA’s price increase for regular Joe and Jane charitable givers hit Minnesota a bit harder.
Another indicator for this effect is the extent to which the two states deviate in the income distribution of their givers. The standard deduction, as a fixed dollar amount, is an easier hurdle for very high income filers to overcome and itemize, all else equal. SOI data for 2017 – 2020 show that higher shares of Colorado itemized deductions for contributions come from high income filers. For tax year 2017 (pre-TCJA), 3.5 percentage points more of Minnesota’s itemized deductions were allowed to filers with AGIs of $100,000 or less, compared with Colorado. Post-TCJA, the difference persisted but dropped to 2.8 percentage points. By contrast, for the 4-year period, 7 percentage points more of Colorado’s itemized deductions were attributable to filers with $1 million or more in AGI than in Minnesota (41% versus 34% for the post TCJA period). The graph shows the latter data.

These effects could explain some of the 2018 difference that McClelland observes, but it has to be a small part of it and not the real explanation. If Minnesota had experienced the same drop as Colorado, it would have resulted in about 87,000 more itemizers, reducing the differences between the two states by maybe 10% to 15%. The fact that Colorado derives proportionately more contributions from higher income givers likely also accounts from some of the difference.
State data differences
Minnesota’s posted data on charitable contributions (i.e., the data used by McClelland) are incomplete because they do not include the contributions deducted as Minnesota itemized deductions. Colorado’s data, by contrast, has no similar omission. That could account for some of the difference. However, the posted Minnesota data also double count some charitable contributions. So, the combined effects could go in the wrong direction.
Undercounts. The data posted on the Minnesota Department of Revenue’s (MDOR) website show charitable contributions claimed on federal Schedule A, which are inferred from the Minnesota income tax sample. (McClelland used SOI numbers which differ because they are derived from the population of returns listing Minnesota addresses filed with the IRS. The SOI amounts differ from the MDOR amounts because of the sample and residency issues. I regard SOI’s numbers as likely more accurate than MDOR’s.) The Minnesota data undercount charitable contributions because they do not include the Minnesota itemized deduction for charitable contributions for filers who take the federal standard deduction but itemize for Minnesota purposes.
Minnesota’s standard deductions amounts equal the federal amounts, but its itemization rules differ. State income taxes are not deductible, while employee business expenses are deductible. Some taxpayers will claim the federal standard deduction but itemize for Minnesota purposes, That occurs when employee business expenses plus their other itemized deductions, other than state income taxes, exceeds the standard deduction. That results in them claiming their charitable contributions as Minnesota itemized deductions, rather than deducting them under the nonitemizer rules. MDOR’s posted data do not report these amounts. I think these amounts are small because for many filers disallowing the income tax deduction will offset allowing employee business expenses.
Overcounts. Conversely, some federal itemizers claim the Minnesota standard deduction and the nonitemizer deduction for charitable contributions. The typical example is a filer whose state income tax deduction is necessary to put them over the standard deduction amount. Thus, for those filers the Minnesota data on the web (either SOI or MDOR) double counts their deductions (the contributions are reported on both Schedule A and as Minnesota nonitemizer deductions). This effect is illustrated by data for the top income strata which show over 106% of returns claimed itemized and non-itemizer charitable contribution deductions, a legal impossibility.
Since I no longer have access to the HITS microsimulation model and income tax sample, I can’t calculate these amounts and I don’t trust my intuition to say even what the sign of the combined change is if these errors were corrected. Thus, this is a blind alley. If I were forced to guess, I would predict the overcounts are more than the undercounts. But I would have little confidence in that guess.
State tax law differences
Another possibility is that some sort of state tax law effect may be responsible. Both states have slightly different charitable giving incentives and differ in their rate structures (flat v. graduated) and bases. There are more similarities than differences, though.
The Colorado and Minnesota legislatures enacted somewhat similar responses to TCJA. Both states had used federal taxable income (FTI) as the starting point for their taxes, thereby incorporating the federal itemized deduction rules, and allowed nonitemizers to deduct charitable contributions. Both responded to TCJA by adopting its higher standard deduction and maintaining their nonitemizer deduction, which now applies to many more filers. Colorado did so under its rolling conformity law; Minnesota by linking to federal AGI but allowing a Minnesota standard deduction equal to TCJA’s and a itemized deduction for contributions following the federal rules.
There are some key differences in the two states’ taxes that may be relevant to charitable contribution behavior:
Rates. Colorado has a flat rate (4.63% in 2017 and 2018), while Minnesota has a graduated rate structure with higher rates (5.35%, 7.05%, 7.85%, and 9.85%). Most of the new non-itemizers after TCJA would be subject to 7.05% and 7.85% Minnesota rates.
Non-itemizer charitable deductions. Both states allow non-itemizers to deduct charitable contributions under similar rules. Contributions over $500 are deductible in computing each state’s taxable income. Colorado allows full deductibility, while Minnesota allows one-half of contributions to be deducted. The incentive effect is determined by multiplying the allowable deduction by applicable marginal tax rates. So, Colorado’s full deductibility offsets its lower tax rate. Of course, what we’re trying to explain is the difference in giving responses in the two states by itemizers that TCJA caused to become standard deduction filers. Thus, the relevant question is whether the combined federal and state changes under TCJA and state conformity for that group had a materially different effect on the after-tax price of giving in the two states. The chart shows the changes.

The graph shows how much TCJA increased the after-tax price of Minnesota and Colorado charitable contribution (expressed in cents per dollar contributed) for a filer who was an itemizer in 2017 and a standard deduction filer in 2018 by levels of AGI. It shows substantial increases in the cost of giving – by about 25 cents/dollar in the sweet spot for these types of givers ($90k to $160k). An increase of that size could be expected to reduce giving, obviously depending upon the elasticity.
But the relevant issue is whether Colorado law did something to mitigate this difference that Minnesota’s law did not. The graph shows that the differences for the two states (the area between the two lines) are small and are unlikely to explain the differences in response in the two states, given any reasonable assumption about elasticity. (The obvious question to me: why was the 2018 decline in Colorado giving so small – only 1% – with the large tax price increase? Standard literature on the elasticity, such as Bakija and Heim, would suggest a larger response. It’s also possible, of course, that 2018 was a particularly good year for charitable giving in Colorado with some very large gifts – for the five tax years I looked at, it had the highest concentration of gifts by resident filers with AGIs of $1 million or more by over 2 percentage points.)
Conservation easement credit. Colorado allows a tax credit for donations of conservation easements. It provides a 50% credit (75% on the first $100,000 of contributed value) – in addition to the deduction under the federal and Colorado state taxes. It has many more complicated rules; it can be partially refundable and can be transferred/sold, for example. This tax expenditure evaluation provides more detail. Minnesota has no comparable incentive. The Colorado credit should stimulate more contributions of conservation easements. This should also result in higher Colorado reported charitable contributions (likely itemized deductions in most cases), since claiming the credit does not appear to disqualify use of the deductions. For 2018 and 2019, Colorado SOI reports $16 million and $14 million in credits claimed respectively, implying about $30 million in value contributed per year. That’s a paltry amount compared to the over $4.6 billion in charitable contributions reported on tax returns by Colorado residents. It’s implausible that it explains the difference between the two states.
Conclusion. It is safe to conclude that state tax law differences do not explain the big difference the 2018 data show. They could explain a very small part of the Colorado advantage, at best.
Reporting differences
This is potential cause that McClelland suggested exploring. 2018 was the first year affected by TCJA’s changes. So, it could have disrupted reporting of contributions on state returns.
Both states responded somewhat similarly to TCJA’s enactment. But the timing of those responses was quite different, and that may have differentially impacted 2018 return filing and taxpayers’ understanding of the applicable rules in the two states. There was a lot more confusion and uncertainty in Minnesota than in Colorado. But it is not obvious why that should lead to different charitable contribution reporting.
Colorado. Colorado is a rolling conformity state. CO Rev Stat § 39-22-103 (5.3) (2018), That means when Congress enacts changes in the federal tax law that affect FTI, those changes automatically apply for Colorado state income tax purposes. Decoupling or failing to follow the federal changes would require the Colorado legislature to enact a law. As a result, when Congress passed TCJA in late December 2017, Colorado taxpayers could be almost certain that its rules would apply to their charitable contributions made in 2018 for both federal and Colorado state income tax purposes. Thus, if TCJA’s standard and itemized deduction changes made them nonitemizers, they would know that they no longer qualified for the federal deduction but would qualify for the Colorado nonitemizer deduction.
Colorado taxpayers, I presume, decided whether or not to make contributions accordingly. They had all year to figure it out, subject to the possibility that the Colorado legislature would make changes. The Colorado forms for 2018 reflected that reality.
Minnesota. If Colorado provided certainty to its filers, Minnesota did the opposite. How the state would respond to the TCJA was still unclear when 2018 filing began.
Minnesota is a fixed conformity state. It links the starting point for its tax (FTI in 2017) to the version of federal law at a fixed date. Minn. Stat. § 290.01, subd. 31. (This is required under a Minnesota Supreme Court decision, which held that a 1960s era rolling conformity statute unconstitutionally delegated legislative power to Congress. Wallace v. Commissioner of Taxation, 184 N.W. 2d 588 (1971).) As a result, how the state would respond to TCJA required legislative action. Minnesota had divided government in 2018 (Democratic governor and Republican legislature), which was unable to agree on a conformity bill during the 2018 legislative session. The legislature did not enact conformity to TCJA until May 2019 after tax year 2018 filing was mostly over.
To make matters worse, Minnesota law required that the election to use itemized deductions or the standard deduction must be made consistently for federal and Minnesota purposes. Minn. Stat. § 290.01, subd. 19 (2018). Because the Minnesota tax was linked to the old, pre-TCJA federal standard deduction, this created the prospect that Minnesota taxpayers would need to forgo claiming Minnesota itemized deductions to use TJCA’s standard deduction for federal purposes. For some taxpayers this would have meant paying higher Minnesota taxes to qualify for lower federal taxes. However, the Minnesota Department of Revenue (MDOR) issued a taxpayer friendly revenue notice in September 2018 allowing inconsistent federal and Minnesota standard deduction elections, even though this was incompatible with the text of the law. Revenue Notice 18-01 (Sept. 4, 2018).
Parsing the language of the revenue notice (last paragraph, p. 2) very carefully would suggest that the federal standard deduction election would determine whether a taxpayer qualified to claim the nonitemizer subtraction. That incongruous result (it would have allowed some taxpayers to double deduct some of their contributions – if they used the federal standard deduction and itemized for Minnesota) was not intended, as later revealed by the instructions (p. 12).
The revenue notice eliminated the uncertainty on the issue of consistent standard deduction elections but not the complexity and confusion as to overall status of TCJA’s changes for Minnesota purposes.
Most insiders expected that the 2019 legislature would enact conformity, much of which would be retroactive to tax year 2018 both to provide tax cuts and to mitigate the ongoing complexity under multiyear provisions like cost recovery allowances. The typical taxpayer, however, would not have had a clue about any of that, of course. The 2019 legislature ultimately did precisely that but not until May 2019.
By necessity, the 2018 filing season proceeded on the assumption that Minnesota was tied to pre-TCJA federal law. Forms were constructed and filers prepared their Minnesota returns using their income and deductions under prior federal law. Despite state law linking to FTI, the combination of TCJA and the failure to pass a conformity bill compelled MDOR to construct the forms starting with AGI and providing Minnesota itemized deductions based on pre-TCJA law. See 2018 M1 instructions. Thus, a filer whose itemized deduction were higher than the pre-TCJA standard deduction but lower than the post-TCJA standard deduction would file claiming itemize deductions, including if applicable those for charitable contributions.
The 2019 legislature passed a conformity bill in May that was retroactive to tax year 2018 with regard to the treatment of TCJA’s charitable contribution changes (higher standard deduction, now directly specified by Minnesota law; higher AGI limits, etc.). This did not require most filers to amend their returns. Rather, MDOR recalculated their tax (assuming the filed forms included the necessary information) allowing the higher standard deduction and converting itemized deductions for charitable contributions to the non-itemizer deduction if applicable (i.e., greater than $500).
So, did this complexity and the potential confusion resulting from temporary nonconformity cause Minnesota filers to underreport their actual charitable contributions on their Minnesota returns (or worse to change their contributing behavior)? As a matter of logic, it should not have. There were two basic possibilities, neither of which would have resulted in less favorable treatment of charitable contributions than provided in Colorado:
- Legislature does nothing. MDOR’s revenue notice made it clear (as of fall 2018) that this would allow a state itemized deduction under pre-TCJA rules for state law purposes with the old lower standard deduction. This would allow full deductibility for itemizers.
- Legislature adopts TCJA’s charitable contribution rules. This is what happened, of course, and variations on it had been proposed in the 2018 legislative session but were not enacted. As noted above, it provides roughly similar state tax benefits to those in Colorado because of the Minnesota subtraction for nonitemizers.
Thus, either of the two likely options would have resulted in about the same tax treatment as in Colorado. No one, for example, proposed or (to my knowledge) even publicly talked about the legislature repealing or curtailing the nonitemizer deduction. In fact, lobbyists for charities had instead proposed expanding it to full deductibility.
But it is certainly possible that the confusion around what the legislature would do and a general failure to recognize that the Minnesota nonitemizer deduction remained in place (or even existed) may have affected giving more in Minnesota than the certainty that prevailed in Colorado. Confusion about how the state would respond was certainly greater in Minnesota and could have been responsible. For example, some/many taxpayers may have simply assumed, based on media coverage of the federal effects of TCJA, that their relatively modest contributions were totally nondeductible and failed to track or report them. (It’s unclear why such an effect would be different in the two states, unless the confusion about a state response in Minnesota factored in.) That could be the explanation and is my best guess but is pure speculation. (FWIW, a MDOR staffer I contacted made a similar conjecture unprompted by me.)
Could MDOR’s re-computation of itemized and standard deductions (i.e., the conversion of reported itemized deductions to nonitemizer deductions) have been responsible? That is not a credible possibility to me. I trust MDOR’s competence and if a mistake like that had been made, it surely would have come to light.
In short, Minnesota’s response to TCJA was much more muddled and confusing than Colorado’s. However, there was never any public discussion or prospect for disadvantaging charitable giving in Minnesota (whatever the response the legislature landed on) than what ultimately occurred, and which is about the same as in Colorado. Thus, it should not have affected giving decisions differentially.
Yearly variations
My last possibility was to explore year-to-year variations as well as differences in giving patterns between the two states. Giving levels vary somewhat from year to year. And it is widely recognized that giving patterns vary from state to state. For example, because of Utah’s strong Mormon ethos it typically has the highest charitable giving relative to income of any state (CNN map) and is likely less responsive to the level of tax incentives.
So, it would be useful to compare giving patterns in Colorado and Minnesota before and after TCJA. Again, what we’re trying to measure is differences in tax responsiveness, not just basic charitable giving tendencies. Unfortunately, the Colorado DOR website has only 5 years of data. It revamped its data starting in 2015 and cautions that earlier data (only 2013 is available on its website) may not be comparable.
The first graph below shows giving by residents as a percentage of AGI from 2015 to 2019 for the two states. The pre-TCJA data show some modest variability (more in Minnesota than Colorado) with the two states showing similar patterns. In two years Colorado is slightly higher and Minnesota in one. The post-TCJA data are confounding with bigger state differences and oscillations between the two years. (Possible inference is that TCJA unsettled charitable giving patterns, at least temporarily.) It’s hard to conclude anything from this, since it implies a bigger response by Minnesotans in the first year and then by Coloradans in the second year.

Decomposing the 2019 effects, giving by itemizers in both states dropped (CO dropped 6%; MN 4%). The difference was that giving by Minnesota nonitemizers increased dramatically (77%), while giving by nonitemizers in Colorado dropped slightly (4%). The large Minnesota jump obviously raises questions about its 2018 data. Both states experienced small declines in the percentage of taxpayers who itemize, although Minnesota’s was larger. The bigger drop could explain some of Minnesota’s increase in nonitemizer contributions but nothing like what occurred. I’m mystified.
Giving reported on Minnesota tax returns has been fairly stable over the last ten years, putting aside TCJA’s impact. The graph below shows 2010 to 2019 data (again as a percentage of AGI). Simple year-to-year variation seems unlikely to provide much explanatory power to understand the two state’s deviations post-TCJA.

Take away
The differences between the two states remain a mystery. A couple factors (differential changes in giving patterns and Colorado’s concentration of more of its giving in the top income strata) could explain part of the big 2018 difference. But adding a year of data further confused things with Minnesota making up all the difference and more. It suggests to me that the responses in the two states were similar and the big dip in 2018 Minnesota giving was an anomaly – either in reporting (most likely) or actual giving. It may be that the failure to enact a 2018 conformity bill with attendant publicity about that and TCJA’s effects sufficiently confused a fair number of filers so they failed to claim the nonitemizer deduction. Illogical, but possible and pure conjecture.
Addendum
Tangential points that I cannot resist making
Reading McClelland piece, spending more time reading other research on TCJA’s effects on charitable giving, and mucking around with the Colorado and Minnesota charitable contribution data reinforced in my mind the case for reforming Minnesota charitable contribution tax incentives. I am being repetitive since I have made this case before (e.g., here, here, and here) but I couldn’t resist.
There has always been a good case for reforming the Minnesota and federal charitable giving tax incentives – to increase their equity and effectiveness. TCJA strengthened that case because it:
- Adversely affected giving. This is the obvious emerging consensus from the research. McClelland’s piece shows that it is smaller than simply looking at the federal data would suggest. But it’s still meaningful and a concern for those who believe it is appropriate to encourage charitable giving with tax incentives.
- Dramatically concentrated tax incentives in the top income strata with its increase in the standard deduction and cap on the SALT deduction. The chart below shows the decline in Minnesota returns claiming the itemized deduction for contributions by income strata, comparing tax years 2017 (pre-TCJA) and 2019.

The change is striking. There are big drops across the aboard, but especially below $500k. Yes, Minnesota’s nonitemizer deduction continues to apply and is claimed much more heavily by the filers in strata below $250k. But they get only half the benefit of itemizers.
My favored fix. I believe the way to do that is what I suggested in this blog post for a revenue neutral reform option:
- Replace both deductions. The standard deduction now functions more as a zero-bracket amount (nontax threshold income amount) rather than a proxy for average itemized deductions. Given that, I see little rationale for bifurcating the level of incentive based on whether you use the standard deduction or not. The disallowance of the first $500 in the non-itemizer deduction was intended to represent (I believe) a rough measure of the portion of the standard deduction for charitable contributions. That rationale makes little sense with the much more generous standard deduction; having differing incentives is confusing without a policy rationale to justify the complexity.
- Limit the incentive to giving over an income threshold (e.g., 2% of AGI or something similar) and a dollar minimum (e.g., $500), so more of the incentive applies at the margin. We don’t need to reward people for what most/many would give without an incentive, and this helps deter people from claiming small amounts they didn’t give because they know they won’t be audited on small amounts.
- Use a credit so the same percentage incentive applies regardless of the tax rate and income level. Yes, high-income people may be more responsive to incentives, but appearances and equity considerations are more important.
- Limit the credit to cash contributions, so the state does not amplify the double federal tax benefits for giving away untaxed appreciation. A big side benefit is to keep MDOR out of auditing and contesting valuations of hard to value property like real estate, art, and similar.
- Disqualify federal itemizers from using the state credit. Given TCJA’s concentration of federal incentives, I would allocate a richer state incentive to those who lost their federal incentive. The way to do that in a revenue neutral proposal is to cut out federal itemizers. This should allow a revenue neutral credit rate of more than 15% to those who no longer qualify for the federal incentives.
- Impose a maximum credit as a disincentive for big givers to forgo the federal deduction to qualify for a more generous Minnesota incentive. This would be a problem if the credit rate goes to 25% or more, for example. The savings from the cap will allow a higher credit rate under the revenue neutral constraint, a more powerful incentive for qualifying contributions.
My original blog post has more detail on my thinking.
Noncash contributions. One of my hobby horses is to get rid of the deduction for untaxed appreciation. Why should owners get a double tax benefit for giving appreciated assets away (no tax on the gain and its gift reduces tax on their other income), when cold hard cash is almost always more useful to charities? Other than for publicly traded securities, valuation challenges and abuses abound too.
Moreover, this benefit is concentrated at the top, raising equity concerns. The chart shows the percentages of noncash contributions by AGI class for Minnesota in 2019. About 75% of contributions by itemizers with incomes below $500k were made in cash. For those with incomes of $500k or more, about half of their contributions were. Put another way, the noncash proportion of the top group’s contributions are twice that of the rest of the filers. You can be sure that most of those contributions include untaxed appreciation that gets the double benefit.

SOI data (with more detail for higher income filers) shows the benefits are even more concentrated at the very top. Figure D in the SOI Report on noncash contributions for tax year 2017, shows that 39% of the noncash donations were made by returns with $10 million or more in income. Foundations and large charitable organizations are the largest beneficiaries of these donations. Id. (p, 5). This is not where Minnesota needs to or should be putting its tax incentives for donations, in my opinion. Federal largesse is sufficient.
Prospects for reform dim
The prospects for enacting a major change along these lines is slim to none. There is little legislative interest (I suggested it several times to legislators when I was working). If there were interest, lobbying would quickly snuff it out. The charity lobby generally opposes changes that take away benefits their constituent members now enjoy. They are happy to lobby for more benefits (e.g., expanding the nonitemizer deduction to 100%), but are unwilling to accept cutting back on existing benefits for a better designed incentive. At least, that was the pattern when I worked for legislature and legislators are loath to cross them.
This is just standard trade association behavior. Governing bodies and representative of trade associations have strong incentives to oppose proposals that create losers among any of their significant constituent member groups (e.g., arts or private higher educational groups that receive many large noncash gifts in this case). Policy collides with interest group politics and dynamics. This is also a big deal in trying to fix business taxation in ways that create winners and losers. Umbrella business trade associations hate mediating conflicts among their members over proposals (no matter how meritorious); it’s easier to just oppose them.