How U.S. Tax Policy Has Changed Since the 1980s and Income Inequality

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Congress’s 2025 tax law kept individual income-tax rates. It also raised the amount of wealth that could be given away or left to heirs before federal estate and gift taxes apply, starting in 2026.

An inheritance can become a source of income, such as interest or dividends. Unequal ownership of income-producing assets can widen the income gap between households. That link is why tax-policy history since the 1980s includes the rules for building and passing on wealth, as well as the top income-tax rate.

A lower top rate did not mean taxes disappeared

The highest statutory federal individual income tax rate was 70 percent before the Reagan-era cuts, fell to 50 percent with the 1981 tax cut, and then to 28 percent under the 1986 reform. That starting point needs a qualification: during the 1970s, earned income already had a 50 percent maximum rate, while other income could face 70 percent.

A marginal rate is the share of the last dollar of income paid in tax; an average rate is the share of income paid in tax overall. A top rate therefore does not describe the fraction of every dollar a wealthy household pays. Nor does comparing two top rates reveal whether deductions, exclusions or the treatment of different income sources changed between those years.

Adjusted gross income is gross taxable income minus specified adjustments, calculated before the standard or itemized deduction.

The IRS’s report for tax year 2022 found that the upper-income groups it examined, from the top 0.001 percent through the top half of returns, paid larger shares of individual income tax than their shares of adjusted gross income. That is evidence of continuing taxation of high incomes, rather than a date when the United States stopped taxing wealthy people. It is also a narrower measure than taxes on wealth or the entire federal tax burden.

For tax year 2026, the IRS lists a top marginal individual income tax rate of 37 percent. The historical question is how the burden changed, not whether it vanished.

The Reagan changes cut rates and changed the tax base

The Economic Recovery Tax Act of 1981 phased in broad individual-rate reductions: the cumulative cuts were 10 percent in 1982, 19 percent in 1983 and 23 percent in 1984 and later years. Withholding reductions took effect on October 1, 1981, July 1, 1982 and July 1, 1983; the top rate fell from 70 percent to 50 percent beginning January 1, 1982.

The early rate cut and the later reform were different kinds of legislation. The Economic Recovery Tax Act of 1981 also increased the small-business allowance for immediately deducting investment costs and scheduled further increases. Businesses could claim the investment tax credit only on the portion of an asset’s cost that they had not immediately deducted.

The 1986 reform repealed the investment tax credit, limited deductions for nonbusiness interest and passive losses, and restricted individual retirement account deductions for taxpayers covered by pensions. It also eliminated the exclusion for capital gains, the profits on asset sales, bringing their top rate into line with ordinary income at 28 percent. The second reform traded lower rates for a broader tax base: more income or fewer deductions could enter the calculation.

Revenue Effects of Major Tax Bills is a Treasury working paper revised in 2006.

A Treasury working paper’s historical comparison reports an estimated revenue reduction averaging 2.89 percent of gross domestic product per year in the first four years after the 1981 law. That is an annual average measured against the size of the economy, not a cumulative dollar total. The paper separately compares current dollars, inflation-adjusted dollars, GDP shares and shares of federal receipts. An unqualified claim that the 1980s cuts cost trillions leaves out the window and the dollar measure needed to judge it.

In current dollars, the paper estimated that the 1981 law reduced receipts by an annual average of $111.4 billion in the first four fiscal years after enactment. The paper describes a method using Treasury estimates from the administration’s first post-enactment January budget. The comparison concerns receipts expected with and without that law, rather than a tally of observed collections. It does not establish a cumulative, trillions-of-dollars loss from all tax legislation of the 1980s.

Later laws moved in both directions

The rate history did not continue downward without interruption. The following changes concern the highest statutory individual rate, rather than the average rate paid by a household.

The 1990 law also eliminated the earlier rate bubble and replaced it with limits on deductions and personal exemptions for upper-income households. The 1986 reform’s 15 percent and 28 percent rates were accompanied by a surcharge that created a 33 percent intermediate bracket. That is another reason a single top-rate number needs context.

The Tax Cuts and Jobs Act reduced the corporate income tax rate from 35 percent to 21 percent, a change that was permanent from the outset. Most of its individual provisions, including the lower rates, were originally scheduled to expire after 2025. An account written before the subsequent law can therefore describe an expiration that no longer applies to the rate schedule.

The rules after the 2025 law

The 2025 reconciliation law preserved the individual brackets of 10 percent, 12 percent, 22 percent, 24 percent, 32 percent, 35 percent and 37 percent permanently, starting in 2026. “Permanent” describes the absence of a scheduled expiration; it does not mean a future law cannot change the rules.

The law also made the qualified-business-income deduction permanent, with changes to its income phaseout ranges and a minimum deduction for eligible taxpayers. This is a deduction that changes the amount entering the tax calculation, rather than a new top rate.

The deduction can cover qualifying income of owners of sole proprietorships, partnerships and S corporations, while employee wages and income through C corporations are ineligible. Its phaseout provisions gradually apply deduction limits as taxable income rises through a specified range.

For most taxpayers, the law set the state and local tax deduction cap at $40,000 for 2025, provided annual increases through 2029, and scheduled a return to $10,000 in 2030. A provision can be expanded for a period even while the individual rate schedule becomes permanent.

The law raised the lifetime estate and gift tax exemption to $15 million for decedents dying after 2025, with inflation adjustments. The exemption concerns estate and gift taxation, so it should not be read as an income-tax bracket.

How investment income and tax preferences shape wealth

Wealth, or net worth, is assets minus liabilities. Income and wealth are related, but they are not interchangeable: a household can own valuable assets whose increase in value has not yet entered its taxable income. Capital gains generally enter income for tax purposes when an asset is sold and the gain is realized.

Generally, a gain is long-term if the asset was held more than one year before disposal, and short-term if it was held one year or less. Net capital gain means long-term gains, after long-term losses and applicable loss carryovers, that remain above any net short-term capital loss.

The IRS describes net-capital-gain rates that can be 0 percent, 15 percent or 20 percent, depending on taxable income. Some gains have special maximum rates of 25 percent or 28 percent, and short-term gains are taxed as ordinary income. Higher-income individuals can also owe the 3.8 percent net investment income tax, which depends on investment income and income above the applicable threshold. Comparing a wage-income bracket with a capital-gains rate without these qualifications can understate the tax on an investment sale.

Inherited property generally receives a tax basis equal to its fair market value at the owner’s death, or an alternate valuation if the estate’s executor elects it. This is commonly called a step-up in basis: the heir’s starting value for tax purposes is reset rather than simply carrying over what the prior owner paid. The income-tax treatment of gains passed to heirs is distinct from whether the estate itself owes estate tax.

Traditional individual retirement accounts and employer plans such as 401(k)s defer tax on contributions and earnings until withdrawal, when the money is taxed as ordinary income. Tax policy can therefore affect wealth building through timing as well as rates. A tax advantage for an account is not, by itself, proof that every dollar placed in it is additional saving rather than money shifted from somewhere else.

The same distinction is necessary when asking whether the Reagan tax cuts created a record number of billionaires. Lower taxes can leave more money available to save, and realization and inheritance rules can affect the taxation of assets. But a count of billionaires measures very large fortunes, not a household-income distribution or a marginal tax rate. The rise of fortunes alongside a tax cut does not isolate the effect of that cut from changes in earnings, markets and asset ownership.

What the inequality evidence actually measures

The Congressional Budget Office’s The Distribution of Household Income, 2023, published in 2026, reported that income inequality decreased in 2023 both before and after transfers and taxes. The extent to which transfers and taxes reduced inequality was similar in 2023 and 2022. An annual decline and a widening historical gap answer different questions; neither is a current-year estimate of household wealth.

The Congressional Budget Office’s historical study of 1979 through 2007 found that average inflation-adjusted after-tax household income rose 275 percent for the top 1 percent, compared with just under 40 percent for the middle 60 percent and 18 percent for the bottom 20 percent. These are historical income-growth figures, not a claim about today’s wealth shares. They show that income became more unequal during that period, including after taxes.

In that historical study, after-tax income meant market income plus transfers, including cash payments and in-kind benefits, minus federal taxes.

For 2007, the same CBO study found that federal taxes and transfers both reduced inequality: inequality in after-tax income was about four-fifths of inequality in market income, using its Gini measure. Their combined redistributive effect was smaller in 2007 than in 1979. Thus rising inequality and a progressive tax system can coexist: redistribution can narrow a gap without reversing the forces widening income before redistribution.

A Gini index summarizes how unevenly income is distributed across a population.

The Census Bureau’s report on calendar year 2025 uses both pretax money income, which excludes in-kind transfers, and post-tax income after federal, state and payroll taxes and credits. It found no statistically significant change in income inequality, measured by the Gini index, between 2024 and 2025. That recent annual comparison answers a different question from the long-run CBO study, and neither is a wealth measure.

The Congressional Research Service identifies technological change, globalization, declining unionization and minimum-wage fluctuations among the factors contributing to wider income inequality since the 1970s. It also discusses winner-takes-all markets, changes in executive pay and increasingly unequal financial wealth generating capital income. The 1980s therefore belong in a longer economic history, rather than an explanation resting on one tax law.

A historical CRS study of top tax rates and economic growth expressly examined correlation rather than a causal relationship. A pattern linking two trends is not enough to tell how much of one was caused by the other. Claims about tax cuts, economic growth or billionaire fortunes need a causal argument appropriate to that question, not just a timeline.

Why taxing top incomes can produce volatile revenue

California’s Legislative Analyst’s Office found that the state’s personal-income-tax base was much more volatile than statewide personal income over 1990 through 2014, partly because the tax base included highly volatile capital gains. Receipts linked to asset sales can rise sharply in good years and fall sharply when gains shrink. Concentration makes the behavior of a relatively small set of taxpayers especially relevant to a budget.

Pew’s review explains that progressive rates can magnify the revenue impact of swings in capital gains, bonuses and stock options concentrated among high-income taxpayers. It also cautions that capital gains affect volatility differently across states and episodes, rather than producing a uniform effect everywhere. Dependence on a volatile revenue stream is a budgeting problem; it does not by itself settle how high a tax rate should be.

CRS explains that step-up in basis can encourage taxpayers to hold assets until death, limiting the revenue available from raising capital-gains rates. A revenue forecast therefore has to consider when taxpayers choose to sell, rather than simply multiply an unchanged tax base by a higher rate. A rate change and a change to the realization or inheritance rules can have different effects on collections.

The trade-offs behind the argument

Kyle Pomerleau’s October 2017 Tax Foundation analysis, Economic and Budgetary Impact of Temporary Expensing, examined the Republican “Big Six” tax framework.

In that historical analysis, the Tax Foundation, a tax-policy research organization, argued that immediate full deductions for investment costs could lower the cost of new investment and make otherwise unattractive projects viable. Its full-expensing analysis projected greater investment and a larger capital stock, rather than reporting an observed result of the proposal.

In that analysis, the Tax Foundation projected that full expensing would lose federal revenue even after including growth, although the projected loss was smaller than in its calculation without growth.

In its current explanation of the enacted law, the Tax Foundation argues that permanent immediate deductions for short-lived investments remove penalties from delayed cost deductions and give taxpayers greater certainty. That is a case based on the tax treatment of investment costs, rather than an observed measurement of the law’s long-term growth effect.

The Institute on Taxation and Economic Policy, another tax-policy research organization, argues that capital-gains preferences disproportionately benefit well-off people and should be limited to raise revenue more progressively. ITEP connects higher revenue from those most able to pay with financing public investments.

ITEP has also supported proposals to limit stepped-up basis and tax millionaire capital gains at ordinary-income rates. Those arguments should be distinguished from the current-law inheritance rule and investment-income tax schedule. The policy choice turns on expected investment responses, the distribution of the burden, the revenue needed and the consequences of taxpayer behavior.

The fiscal-cliff agreement illustrates the governing process: Congress and President Obama agreed on legislation that retained most earlier rate cuts but restored the higher top rate. A future tax debate deserves the same scrutiny of the actual law, including which income it reaches and when its changes take effect. Check the tax year on an IRS rate announcement and the measurement year on an inequality report before comparing them.

A proposal advertised as helping or penalizing wealthy people still needs to answer a concrete question: is it changing the rate on income, the rules for building and transferring assets, or both? That answer determines what a top-rate headline can illuminate, and what it leaves in the dark.