What Are Tax Reforms and How Do They Affect You?

Tax reforms are overhauls of a country’s tax laws, and how they affect you depends on which rates, deductions, credits, and rules for defining taxable income get rewritten in the package. A reform is not a single rate adjustment or a new credit dropped into an otherwise unchanged code. It is a bundle of changes that shifts who pays, how much, and on what. After a big one, your paycheck withholding, your itemized deductions, your quarterly estimates, and even your state return can all move at once.

The United States has been through several of these overhauls. The Tax Reform Act of 1986 collapsed up to 15 income tax brackets with a top rate of 50 percent down to two brackets at 15 and 28 percent, paid for by repealing the long-term capital gains exclusion and cutting back deductions.¹ The Tax Cuts and Jobs Act of 2017 lowered all seven individual bracket rates, nearly doubled the standard deduction, and permanently cut the corporate rate from 35 to 21 percent.² Most of the TCJA’s individual provisions were set to expire after 2025, which is why Congress passed the One, Big, Beautiful Bill Act on July 4, 2025, permanently extending those rate cuts and adding new deductions for tips and overtime pay.³

What Reforms Try to Change

Reforms have goals, and the goals compete with each other. That is why the details of any given package look the way they do.

Economic growth is one driver. Lower rates on businesses and investment are meant to encourage hiring, equipment purchases, and expansion. The TCJA’s cut of the corporate rate to a flat 21 percent was framed in exactly those terms.⁴

Fairness is another. A more progressive system charges higher earners a larger share; a flatter one moves closer to equal rates. The direction a reform takes depends on who writes it.

Simplification is a stated goal of nearly every reform, though results vary. Americans spent an estimated 7.1 billion hours complying with the tax code for tax year 2024, with out-of-pocket costs totaling roughly $148 billion and the average individual filer spending about 13 hours and $290. The TCJA’s larger standard deduction moved millions of filers away from itemizing, which genuinely simplified those returns, even as new provisions and phase-outs added complexity elsewhere.

Finally, revenue. A reform can be designed to raise more, to be revenue-neutral, or to cut taxes outright on the theory that growth or spending cuts will fill the gap. The 1986 reform aimed for revenue neutrality. The TCJA and the One, Big, Beautiful Bill Act did not; both reduced projected federal collections.

The Building Blocks That Change Your Bill

Reform packages assemble a few standard components. Knowing which ones moved in a given law tells you where to look for changes to your own return.

Rates

Adjusting marginal rates is the most visible piece of any reform. For 2026, the seven individual brackets are 10, 12, 22, 24, 32, 35, and 37 percent, permanently locked in after the One, Big, Beautiful Bill Act extended the TCJA structure. The top 37 percent rate applies to single filers with income above $640,600 and joint filers above $768,700.⁵ The corporate rate has stayed at 21 percent since the TCJA.

Deductions and Credits

The standard deduction for 2026 is $16,100 for single filers and $32,200 for married couples filing jointly, roughly double the pre-TCJA level and now permanent.⁵ The state and local tax (SALT) deduction had been capped at $10,000 under the TCJA; the One, Big, Beautiful Bill Act raised that cap to $40,000, with a 1 percent annual increase through 2029.²

The child tax credit rose from $2,000 to $2,200 per qualifying child and is now indexed to inflation.⁶ The 2025 law also created new deductions for qualified tips (up to $25,000 a year) and overtime pay (up to $12,500 for single filers, $25,000 for joint filers). Both phase out for taxpayers with modified adjusted gross income above $150,000, or $300,000 filing jointly.⁷

What Counts as Taxable Income

The tax base is what actually gets taxed. Broadening it (fewer exemptions and loopholes) lets the government collect the same revenue at lower rates. Narrowing it shields more income from tax. The 1986 reform was the textbook base-broadening case, repealing the capital gains exclusion and eliminating dozens of deductions to finance lower rates.¹ The TCJA and the 2025 law went the opposite direction in places, adding new deductions (tips, overtime, qualified business income) that narrow the base.

Business Provisions

Beyond the corporate rate, reforms usually rewrite depreciation schedules, international rules, and industry incentives. The TCJA created a 20 percent deduction for qualified business income earned through pass-through entities such as partnerships, S corporations, and sole proprietorships; that deduction was originally set to expire after 2025 and has now been made permanent.⁴

Who Gains and Who Doesn’t

No reform hits everyone the same way. The details decide.

Rate cuts and a larger standard deduction reduce tax bills across income levels, but the dollar value of the benefit skews toward higher earners. A taxpayer in the 12 percent bracket saves less in absolute dollars from a one-point rate cut than someone in the 37 percent bracket, even though both brackets moved by the same amount. Analyses of the TCJA found the largest benefits as a share of after-tax income went to those at the top.²

The higher SALT cap mainly helps taxpayers in high-tax states who own property and itemize. If you rent in a state with no income tax, you probably never touched the old $10,000 cap, let alone the new $40,000 ceiling. The new tip and overtime deductions target hourly and service workers directly, provided income stays below the phase-out thresholds.⁷

For businesses, the 21 percent corporate rate helps C corporations directly. Most U.S. small businesses are pass-throughs, though, so their owners feel reform through the individual side and through the 20 percent qualified business income deduction, which carries income limits and restrictions for certain service industries.⁴

At the aggregate level, tax cuts that are not offset by spending reductions increase the federal deficit. Growth from lower taxes can recover some of the lost revenue but historically not all of it, which is why both the TCJA and the One, Big, Beautiful Bill Act are projected to add to the national debt.

Federal Reform Doesn’t Automatically Change Your State Return

This is the piece most people miss. A federal tax reform does not automatically flow through to your state taxes. States connect to the federal code in different ways: some use rolling conformity and adopt federal changes as they happen, some use fixed-date conformity that requires the legislature to actively adopt new changes, and some pick and choose provision by provision.

Any state can also decouple from a federal provision it doesn’t want. If a new federal deduction would shrink the state’s tax base, the state can simply decline to recognize it. That means a deduction on your federal return might not be available on your state return. After the TCJA, dozens of states had to decide which provisions to adopt, modify, or reject, and many made different choices. The same process is playing out now with the 2025 law’s tip and overtime deductions.

The practical step: after a major federal reform, check whether your state has conformed. State income tax rates run from zero to over 13 percent, and whether a federal deduction flows through can meaningfully change what you owe.

What to Do After a Reform Passes

When the law changes, your paycheck withholding and estimated payments may no longer match what you will actually owe. Underpaying through the year triggers penalties at filing time, so it is worth getting ahead of.

The IRS Tax Withholding Estimator gets updated after major reforms. The tool walks you through your income, withholding, credits, and deductions, then tells you whether to adjust your W-4 with your employer. Gather your most recent pay stubs and last year’s return before you start. The estimator was updated after the One, Big, Beautiful Bill Act to reflect the new provisions for tips, overtime, car loan interest, and senior deductions.⁸

If you’re self-employed or have significant income without automatic withholding, recalculate your quarterly estimated payments. The safe harbor rules protect you from underpayment penalties if you meet one of these thresholds: you owe less than $1,000 after subtracting withholding; you paid at least 90 percent of your current-year tax liability; or you paid 100 percent of last year’s tax, or 110 percent if your adjusted gross income exceeded $150,000. When a reform changes your expected liability, the prior-year safe harbor is often the simplest to lean on because it doesn’t require you to predict how the new law will affect your current-year numbers.

The people most likely to need a withholding adjustment after a reform: those with more than one job, those who recently married or had a child, those who itemize, and anyone who received a large unexpected refund or owed additional tax last filing season. Spending 25 minutes with the estimator now is far cheaper than a penalty in April.

1
Congress.gov. H.R.3838 – Tax Reform Act of 1986
2
Legal Information Institute. Tax Cuts and Jobs Act of 2017
3
Internal Revenue Service. One, Big, Beautiful Bill Provisions
4
Internal Revenue Service. Tax Cuts and Jobs Act – A Comparison for Businesses
5
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
6
Congress.gov. The Child Tax Credit – How It Works and Who Receives It
7
Internal Revenue Service. How to Take Advantage of No Tax on Tips and Overtime
8
Internal Revenue Service. Updated Tax Withholding Estimator Lets Millions of Taxpayers Take One, Big, Beautiful Bill Changes into Account When Calculating Their Withholding