The Trump administration has promoted a historic tax cut. But a comparison of major federal tax legislation shows it doesn't rank first under every measure.
A taxpayer-funded Trump administration ad touts what it calls the “largest tax cuts in history.” But while the president’s 2025 tax law is projected to reduce federal revenue by trillions of dollars, its place in history depends on how the size of tax cuts is measured.
President Donald Trump signed the One Big Beautiful Bill Act into law on July 4, 2025. The law extended many of the individual tax cuts enacted during his first term, made changes to business taxes and introduced new tax breaks for certain workers, seniors and car buyers.
The administration has promoted the law as a historic tax cut. But a comparison of major federal tax legislation shows it does not rank first under every common measure.
How big are the tax cuts?
The Congressional Budget Office estimates that the law will reduce federal revenues by about $4.5 trillion over the 2025–2034 period. That is the projected reduction in money collected by the federal government, not the amount every taxpayer will save.
The law also includes spending provisions. The CBO estimates that, taken together, the legislation will increase federal deficits by about $3.4 trillion over the same period, excluding additional interest costs on the national debt.
Those figures make the law substantial in dollar terms. But comparing tax cuts enacted decades apart using nominal dollars alone can be misleading. The economy has grown, prices have changed and the federal government collects and spends more money than it did in earlier periods.
One alternative is to measure a tax cut’s projected revenue reduction as a share of gross domestic product, or GDP, which represents the value of goods and services produced in the economy.
Under that measure, the Tax Foundation ranks the 2025 law sixth among major federal tax cuts enacted since 1940. Its analysis estimates that the law will reduce revenue by about 1.4% of GDP over its budget window.
The 1981 tax cuts signed by President Ronald Reagan were larger by this measure, with a revenue reduction of about 2.9% of GDP, according to the Tax Foundation.
The ranking depends on the methodology and the time period used. Still, the comparison shows why describing the 2025 law as the largest tax cut in U.S. history requires qualification.
Who benefits from the tax cuts?
The law extends many provisions of the 2017 Tax Cuts and Jobs Act and adds new deductions, including tax breaks for qualified tips, eligible overtime compensation, certain car-loan interest and seniors age 65 and older.
WASHINGTON, DC - NOVEMBER 17: U.S. President Donald Trump delivers remarks at the McDonald’s Impact Summit at the Westin DC Downtown on November 17, 2025 in Washington, DC. Trump spoke on the economy and highlighted his One Big Beautiful Bill Act, including its provisions for tax breaks on tips and overtime as he addressed the group of McDonald’s restaurant franchise owners. (Photo by Win McNamee/Getty Images)The new deductions can reduce taxes for eligible people, but they do not benefit every taxpayer equally. Eligibility rules, income limits and the amount of income subject to each provision affect how much an individual saves.
The broader distribution of the law’s tax benefits also matters.
An analysis by the Tax Policy Center estimates that, in 2026, households in the top 20% of the income distribution will receive almost 60% of the tax cuts. The bottom 20% will receive an average tax cut of about $150, compared with more than $12,000 for the top 20%, according to the center’s estimates.
These figures are estimates of average tax changes across income groups, not guarantees of what any particular household will save. Individual results depend on income, family circumstances and eligibility for specific provisions.
What about Social Security taxes?
The law also provides a new deduction of up to $6,000 for eligible taxpayers age 65 and older. The deduction phases out at higher incomes.
However, the provision does not eliminate federal income taxes on Social Security benefits. Instead, it can reduce taxable income for eligible seniors, potentially lowering their overall tax bill.
What the numbers show
The Trump administration’s tax law represents a major reduction in projected federal revenue, but the claim that it is the “largest tax cut in history” depends on the measure used.
In raw dollar terms, the projected revenue reduction is about $4.5 trillion over 10 years. When measured as a share of GDP, however, the Tax Foundation ranks the law sixth among major federal tax cuts since 1940.
The distribution of the benefits is also uneven: the Tax Policy Center estimates that higher-income households receive a substantially larger share of the tax cuts than lower-income households.
The figures provide important context for evaluating the administration’s claim, including the size of the tax cuts, their distribution and their projected effect on federal finances.
