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High-Income Tax Avoidance Far Larger Than Thought, New Paper Estimates

Richard Rubin Wall Street Journal

Date Posted:: March 22, 2021
Is Database:: Database

High-income households fail to report 21% of their income, with 6% attributed to undetected strategies. Offshore accounts & pass-through businesses drive underreporting. @RichardRubin @WSJ

Research indicates that the top 1% of households fail to report about 21% of their income, with 6 percentage points attributed to sophisticated strategies undetected by random audits. For the top 0.1%, unreported income may be nearly twice as large as conventional IRS methodologies suggest. This underreporting is largely driven by offshore accounts and pass-through businesses. Internal IRS data revealed that offshore accounts were detected only 7% of the time during random audits. The study assumes noncompliance rates for pass-throughs between those of large corporations and sole proprietorships, leading to higher projections of tax avoidance than previous IRS methods. These findings highlight significant gaps in current IRS detection capabilities and suggest a need for enhanced auditing techniques to address high-income tax evasion.

Richard Rubin reports on Research that argues tax avoidance/evasion at the top is significantly larger than prior estimates, "...The top sliver of high-income Americans dodge significantly more in income taxes than the Internal Revenue Service’s methods had previously assumed, according to forthcoming estimates from IRS researchers and academic economists. Overall, the paper estimates that the top 1% of households fail to report about 21% of their income, with 6 percentage points of that due to sophisticated strategies that random audits don’t detect. For the top 0.1%, unreported income may be nearly twice as large as conventional IRS methodologies would suggest, the researchers wrote...."
Their finding is largely driven by offshore accounts and pass throughs, "... Using internal IRS tax-return data, the researchers looked at people who disclosed offshore accounts about a decade ago when the IRS was encouraging people to come forward in exchange for more-lenient treatment. They found that hundreds of them had been picked years before their disclosures for the random audits that the IRS uses to measure tax avoidance—and that the IRS auditors found the offshore accounts just 7% of the time. For the pass-through businesses and complex partnerships, the researchers assumed noncompliance rates between those of large corporations and sole proprietorships, both areas where the IRS has better data than in those random audits it uses for research purposes on pass-throughs. That led to higher projections of avoidance than previous IRS methods...."
Note Zucman is a co-author so suspect the findings are overstated. Aside Natasha Sarin is going to Treasury as deputy assistant secretary for economic policy, her recent tax work (attached) is prob going to become relevant

Richard Rubin, "High-Income Tax Avoidance Far Larger Than Thought, New Paper Estimates," Wall Street Journal, March 22, 2021, https://www.wsj.com/articles/high-income-tax-avoidance-far-larger-than-thought-new-paper-estimates-11616364001

Ongoing State Tax Revenue Implications of the 2026 California Billionaire Tax Act

Jared Walczak California Tax Foundation

Date Posted:: April 28, 2026
Is Database:: Database

Walczak estimates the 2026 California Billionaire Tax Act would reduce annual state tax revenues by ~$3.53B to $4.49B due to billionaire departures and associated spillovers. The NPV of these ongoing losses would be several times the wealth tax revenue.

This paper estimates ongoing annual reductions in state tax revenue under scenarios based on announced and anticipated billionaire departures. The analysis considers direct impacts on individual income and, to a much lesser extent, sales tax collections, along with spillover effects. We identify 212 California billionaires using the Forbes billionaire list and classify each based on whether their wealth is primarily held in publicly traded equity, a privately held operating business, financial fund management, or a diversified mix of sources. We use classification-specific assumptions of income loss subject to a given billionaire’s departure, assuming that only 5% of public founders’ income will remain California source after a departure, compared to 55 percent for private operating business owners, 35% for financial management, and 15% for diversified wealth. Under our primary scenarios, the wealth tax yields ongoing reductions of $3.53 billion to $4.49 billion per year in income, sales, and other tax collections. Calculations based exclusively on the nine publicly identified billionaire emigres yield $2.77 billion in recurring revenue loss and can be regarded as a lower bound. Actual out-migration almost certainly already exceeds that which has been publicly reported, and continued departures should be expected should the initiative advance.

Takeaways by Macro Roundup^® AI

California’s billionaire tax drives $3.53bn–$4.49bn in annual ongoing revenue losses, exceeding one-time collections and resulting in net fiscal harm.
Billionaire out-migration reduces individual income tax collections by multiples of direct wealth tax revenue, leading to structural state budget deficits.

Massachusetts Loses Billions in Income After Millionaire Tax

Greg Ryan Bloomberg

Date Posted:: March 20, 2026
Is Database:: Database
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Net outflows of adjusted gross income from Massachusetts increased 8% y/y in 2023 to $4.2B, after a 4% surtax on income over $1mm took effect. Top earners leaving the state were responsible for 70% of the outflow.

Residents exiting Massachusetts took a net of $4.2 billion in adjusted gross income with them in 2023, one of the largest totals in the country, after a tax on millionaires took effect. The amount was an 8% year-over-year increase, according to Internal Revenue Service data, even as the total number of taxpayers leaving the state slowed. This was the first year that residents were subject to a 4% surtax on incomes over $1 million after voters approved the levy in 2022 to fund schools and transportation. Despite the tax’s implementation, the number of residents moving out of Massachusetts who reported income of $200,000 or more — the top bracket tracked in the IRS data — fell year-over-year. Net outflows from Massachusetts long predate the millionaires tax, especially to Florida and New Hampshire, its northern neighbor, which has no tax on wages or capital gains. Total lost income was also higher in 2021 than 2023. The state’s millionaires-tax collections have increased every year since 2023 and so far in fiscal 2026 have jumped 19% year-over-year to $1.3 billion.

Who Is Paying for the 2025 U.S. Tariffs?

Mary Amiti, Chris Flanagan, Sebastian Heise, and David Weinstein Federal Reserve Bank of New York

Date Posted:: February 13, 2026
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A FRBNY analysis finds that ~90% of tariffs’ economic burden was borne by American firms and consumers in the first 8 months of 2025. Between January and November, however, that incidence declined 8pp as firms reorganised supply chains.

94% of the tariff incidence was borne by the U.S. in the first eight months of 2025. This result means that a 10% tariff caused only a 0.6 percentage point decline in foreign export prices. The tariff pass-through into import prices has declined in the latter part of the year. That is, a larger share of the tariff incidence was borne by foreign exporters by the end of the year. In November, a 10% tariff was associated with a 1.4 percent decline in foreign export prices, suggesting an 86% pass-through to U.S. import prices. Given that the average tariff in December was 13% our results imply that U.S. import prices for goods subject to the average tariff increased by 11% (13 times 0.86) more than those for goods not subject to tariffs. These higher import prices caused firms to reorganize supply chains.

Supply and The Mam

Michael Cembalest J.P. Morgan

Date Posted:: February 5, 2026
Is Database:: Database

At ~15%, NYC has the highest combined city-state personal tax rate in the US, and the top marginal corporate income tax rate at 17.4%. The city also has the highest industrial, retail and multifamily property taxes per square foot of 10 major cities.

NYC has the highest combined city-state personal tax rate in the US and the highest all-in corporate income tax rate at 17.4% (state plus city plus MTA surcharge). According to the [Citizens Budget Commission], New York State is the highest tax jurisdiction in the US based on tax collections per capita and #2 on tax collections per $1,000 of personal income. NYC has the highest industrial, retail and multifamily property taxes per square foot of ten major cities.

Laffer Curves Are Flat

Rachel Moore, Brandon Pecoraro and David Splinter Joint Committee on Taxation

Date Posted:: January 28, 2026
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JCT calculations suggest that properly constructed individual income tax Laffer curves are flat over wide ranges. Modeling shifting across business types and interactions btw various taxes under 2022 law, they find revenue is ~ constant for top rates btw 37% and 55%.

Laffer curves estimated with more realistic taxes are flatter, suggesting less potential revenue gains from top rate increases and a lower revenue-maximizing top rate. Standard simplifications miss meaningful behavioral margins such as shifting across tax bases and sectors. Interactions between federal individual income taxes and other taxes produce even flatter Laffer curves and smaller revenue gains from higher top rates. Panel A of Figure 2 shows how federal individual income tax revenues change as the top tax rate varies along the x-axis. With a broad base, total income enters the tax function as a single base, applying the top rate to all income even though much of it qualifies for lower preferential tax rates. With a narrow base, only wage income enters the tax function, which fails to apply the top tax rate to any capital income. The true tax base lies between the narrow and the broad base. The Laffer curve estimated using the tax calculator and true base reaches a more modest peak (only 1.3% more tax revenue) at a top tax rate of 47%. Notably, this additional federal income tax revenue is only about 0.1% of GDP. Relative to both the narrow and broad bases, the true base implies smaller potential revenue gains and a lower revenue-maximizing top tax rate.

California’s Billionaire Tax Plan Will Backfire

Michael Moritz Financial Times

Date Posted:: January 13, 2026
Is Database:: Database

In 1950, sales taxes accounted for ~60% of California’s revenue, and personal income taxes accounted for 11%. In recent years, the personal income tax share has risen to ~60%, with the top 1% of California taxpayers responsible for ~40% of the revenue.

In 1957, Fairchild Semiconductor, the company that spawned Silicon Valley, was formed by eight men — only one of whom was born in California. At the start of that decade the state’s population was about 10.5mn and only about 11% of its revenue of $1.1bn came from personal income taxes. The sales and use tax (levied on products not services) accounted for almost 60%. Today, California’s population is about 39.5mn while its budget is about $320bn (not including the $174bn the state receives from Washington for social welfare programmes). Since 1990, the budget has grown at an average rate of 6% a year. Compared to the 1950s, the source of the state’s revenue has entirely flipped. In recent years personal income taxes have contributed more than 60% of the total. This revenue rests on a foundation of jelly. In 2022, the top 1% of California taxpayers — just 170,000 payers — coughed up about 40% of all the state’s personal income tax revenues. Worse still, these payments are highly contingent on unpredictable capital gains.

High-income households fail to report 21% of their income, with 6% attributed to undetected strategies. Offshore accounts & pass-through businesses drive underreporting. @RichardRubin @WSJ

Walczak estimates the 2026 California Billionaire Tax Act would reduce annual state tax revenues by ~$3.53B to $4.49B due to billionaire departures and associated spillovers. The NPV of these ongoing losses would be several times the wealth tax revenue.

Will California's Billionaire Tax Act lead to long-term revenue losses?

Takeaways by Macro Roundup® AI

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Net outflows of adjusted gross income from Massachusetts increased 8% y/y in 2023 to $4.2B, after a 4% surtax on income over $1mm took effect. Top earners leaving the state were responsible for 70% of the outflow.

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A FRBNY analysis finds that ~90% of tariffs’ economic burden was borne by American firms and consumers in the first 8 months of 2025. Between January and November, however, that incidence declined 8pp as firms reorganised supply chains.

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At ~15%, NYC has the highest combined city-state personal tax rate in the US, and the top marginal corporate income tax rate at 17.4%. The city also has the highest industrial, retail and multifamily property taxes per square foot of 10 major cities.

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JCT calculations suggest that properly constructed individual income tax Laffer curves are flat over wide ranges. Modeling shifting across business types and interactions btw various taxes under 2022 law, they find revenue is ~ constant for top rates btw 37% and 55%.

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In 1950, sales taxes accounted for ~60% of California’s revenue, and personal income taxes accounted for 11%. In recent years, the personal income tax share has risen to ~60%, with the top 1% of California taxpayers responsible for ~40% of the revenue.

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Takeaways by Macro Roundup^® AI