What changed under Trump's tax policies

Tax law changed significantly under the Trump administration, particularly through the Tax Cuts and Jobs Act of 2017. That law lowered tax rates for most income brackets, nearly doubled the standard deduction, and changed how child tax credits work. It also affected business taxes, investment income, and deductions for state and local taxes.

Whether those changes help or hurt your household depends on your income level, how many dependents you have, what kind of income you earn, and which deductions you used to claim. A person earning $40,000 a year may see different results than someone earning $150,000. Someone who owns a business sees different effects than someone who only receives a paycheck.

The tax law passed in 2017 included expiration dates. Many of the individual tax rate cuts are scheduled to end after 2025 unless Congress extends them. Business tax changes were permanent. Understanding which parts of your tax situation changed, and which might change again, helps you plan ahead.

Key Takeaways

  • The 2017 tax law lowered income tax rates for most brackets and nearly doubled the standard deduction, which reduced taxes for many households.
  • The child tax credit increased from $1,000 to $2,000 per child, though the rules for who can claim it changed.
  • Deductions for state and local taxes were capped at $10,000, which affects people in high-tax states more than others.
  • Many individual tax provisions expire after 2025 unless Congress votes to extend them, so your tax situation may change again.
  • Your actual tax bill depends on your specific income, deductions, dependents, and type of work — comparing your 2016 and 2017 tax returns shows your personal impact.

Income tax rates and brackets under the 2017 law

The 2017 tax law created seven income tax brackets instead of the previous structure. For most people, the rates went down. The top rate dropped from 39.6% to 37%. The lowest rate stayed at 10%, but the income ranges for each bracket changed.

The standard deduction — the amount you can subtract from income before calculating tax — nearly doubled. For 2017, the standard deduction was $6,350 for single filers and $12,700 for married couples filing jointly. By 2018, those numbers rose to $12,000 and $24,000. That means more income is untaxed before you owe federal tax.

These rate cuts and deduction increases are set to expire after December 31, 2025, unless Congress extends them. If they expire, tax rates will return to the 2017 levels and the standard deduction will adjust downward. This is important to know if you are planning finances for 2026 and beyond.

Changes to the child tax credit and dependent deductions

The child tax credit doubled from $1,000 per child to $2,000 per child under the 2017 law. The income limits for claiming the full credit also changed. For married couples filing jointly, the credit begins to phase out at $400,000 of income instead of $440,000.

The law also eliminated the personal exemption — a deduction you used to claim for yourself, your spouse, and each dependent. Instead, the higher standard deduction replaced that benefit for most households. Families with many children may have seen a smaller overall tax cut than families with fewer dependents, depending on their income level.

The credit is partially refundable, meaning you can receive money back even if you owe no tax. The refundable portion is limited to $1,600 per child, and you must have earned income to claim it. The rules for who counts as a dependent also stayed the same — the child must be under 17, a U.S. citizen, and claimed by only one taxpayer.

State and local tax deduction limits

One of the most significant changes for some households is the cap on state and local tax deductions, known as SALT. Before 2017, you could deduct all state income taxes, property taxes, and sales taxes you paid. The new law caps the total deduction at $10,000 per year.

This change hits hardest in states with high income taxes or high property values. Someone in California, New York, or New Jersey may lose thousands in deductions. Someone in a state with no income tax or low property taxes may not be affected at all. If you own a home with a mortgage, you still deduct mortgage interest separately — the $10,000 cap applies only to SALT.

This cap is also set to expire after 2025. If Congress does not extend it, the SALT deduction will return to unlimited. For now, if you live in a high-tax state and own property, this change likely increased your tax bill compared to 2016.

Business income and self-employment tax changes

The 2017 law created a new deduction for business owners and self-employed people. The may have access to business income deduction allows may be able to access people to deduct up to 20% of their business income from their taxable income. This deduction is permanent and does not expire after 2025.

The corporate tax rate dropped from 35% to 21% and is permanent. This affects people who own C corporations or S corporations differently than sole proprietors. Pass-through entities like LLCs and S corporations benefit from the 20% deduction, while C corporation owners benefit from the lower corporate rate.

Self-employment tax — the Social Security and Medicare tax you pay as a self-employed person — did not change. You still owe 15.3% on net self-employment income above $400. The business income deduction reduces your taxable income but not your self-employment tax.

Investment income and capital gains treatment

Long-term capital gains tax rates did not change under the 2017 law. They remain at 0%, 15%, or 20% depending on your income level. However, the income thresholds that determine which rate applies shifted slightly because of the new tax brackets.

Dividends from stocks and mutual funds continue to be taxed as long-term capital gains if you held the investment for more than one year. Short-term gains — from investments held one year or less — are taxed as ordinary income at your regular tax rate.

The net investment income tax of 3.8% on certain investment income for high earners remained in place. This tax applies to people earning over $200,000 (single) or $250,000 (married filing jointly) and affects capital gains, dividends, and rental income.

Comparing your 2016 and 2017 tax returns

The clearest way to see how the tax law changes affected you personally is to look at your actual tax returns from before and after. Pull your 2016 return (filed in 2017) and your 2017 return (filed in 2018) and compare the total tax owed on each.

Keep in mind that your tax bill also depends on changes in your personal situation — whether you got married, had a child, changed jobs, or had different investment income. A tax cut from lower rates might be offset by a higher income or loss of deductions you used to claim.

If you want to understand the impact of the law itself rather than your personal changes, a tax professional can run a "what-if" calculation showing what you would have owed under 2016 rules versus 2017 rules, holding everything else the same. This is especially useful if you are trying to plan for 2026 when some provisions expire.

Frequently Asked Questions

Will my taxes go back up after 2025?

Many provisions of the 2017 tax law expire after December 31, 2025, unless Congress votes to extend them. This includes the lower income tax rates, the higher standard deduction, and the child tax credit amounts. If they expire, your tax bill could increase. Congress may extend some or all of these provisions before the deadline.

Does the $10,000 SALT cap apply to me?

The cap applies if you itemize deductions instead of taking the standard deduction. If your state income taxes plus property taxes plus sales taxes exceed $10,000, you can only deduct $10,000 total. If you take the standard deduction, the SALT cap does not affect you because you are not itemizing any deductions.

Can I claim the 20% business income deduction?

The deduction is available to self-employed people, owners of partnerships, S corporations, and LLCs. It is not available to W-2 employees. Your income level and the type of business you run affect whether you can claim the full 20% or a reduced amount. A tax professional can determine your specific situation.

What if I owe more taxes now than I did in 2016?

Some households saw tax increases under the 2017 law, particularly high earners in states with high taxes who lost significant SALT deductions. Others saw increases because their personal situation changed — higher income, fewer dependents, or different investment income. Comparing your 2016 and 2017 returns shows whether the law itself or your circumstances caused the change.

Where can I find my actual tax liability under the new law?

Your tax return itself shows your liability. Form 1040 and your supporting schedules show your income, deductions, credits, and final tax owed. If you want to understand how specific changes affected you, the IRS website has tax tables and worksheets. A tax professional or tax software can also show you how different scenarios would change your bill.