What a tax exemption is

A tax exemption is a reduction in the income you have to report to the IRS. Instead of paying tax on all your income, you subtract a set amount — called an exemption — and pay tax only on what remains. The IRS sets the exemption amount each year, and it changes based on inflation.

Tax exemptions are different from tax deductions. A deduction lowers your taxable income by a specific expense you paid (like mortgage interest or medical bills). An exemption lowers it by a flat amount that depends on who you are and your family structure, regardless of what you spent.

Not all taxpayers get exemptions. The rules depend on your age, your income level, and whether someone else claims you as a dependent on their return.

Key Takeaways

  • A tax exemption reduces the income you report to the IRS by a set dollar amount that the IRS updates each year.
  • You may not be able to claim an exemption if your income is above a certain threshold or if another taxpayer claims you as a dependent.
  • Personal exemptions were suspended for most taxpayers from 2018 through 2025 under the Tax Cuts and Jobs Act, though dependent exemptions still exist in a different form.
  • Dependent exemptions allow you to reduce your taxable income if you support a child, parent, or other may have access to relative.

Personal exemptions and the current tax law

From 2018 through 2025, the federal government suspended personal exemptions — the exemption you could claim for yourself. This happened when Congress passed the Tax Cuts and Jobs Act. Before 2018, you could claim one exemption for yourself and one for your spouse if you filed jointly. That exemption amount was roughly $4,000 to $4,200 per person per year.

Even though personal exemptions are suspended, you may still see the term on older tax forms or websites. The suspension is temporary and set to expire after 2025, meaning personal exemptions could return in 2026 unless Congress extends the suspension or makes it permanent.

Check the IRS website or your tax software each year to confirm whether personal exemptions are available in the tax year you are filing for.

Dependent exemptions and how they work

A dependent exemption lets you reduce your taxable income if you support someone else — usually a child, but also a parent, sibling, or other relative who lives with you and meets IRS rules. The person you claim must be a U.S. citizen, national, or resident alien, and their income must fall below a threshold set by the IRS each year.

You can claim a dependent exemption only if no one else claims that person on their tax return. If your child's other parent claims them, you cannot also claim them. The IRS matches dependent claims across all returns filed, so claiming the same person twice will trigger an audit.

Dependent exemptions were also reduced under the Tax Cuts and Jobs Act, but they were not eliminated entirely. Instead, they were replaced with an expanded Child Tax Credit for children under 17. The credit is usually worth more than the old exemption was, but it works differently — it is a direct reduction in the tax you owe, not a reduction in your income.

Income limits and phase-outs

If your income exceeds a certain level, the IRS may reduce or eliminate your exemptions. This is called a phase-out. The income threshold depends on your filing status (single, married filing jointly, head of household, and so on) and changes each year.

For dependent exemptions, the phase-out begins at higher income levels than it did for personal exemptions. If you earn above the threshold, you lose a portion of your exemption for each dollar of income over the limit. Once your income reaches a certain point, you lose the exemption entirely.

Your tax software or a tax professional can tell you whether your income triggers a phase-out in the year you are filing for. The IRS publishes updated thresholds on its website each January.

Claiming exemptions on your tax return

You report exemptions on your federal income tax return — either Form 1040 or a simplified version like Form 1040-SR if you are 65 or older. The form asks you to list each dependent you are claiming, along with their Social Security number and relationship to you.

If you are claiming a dependent, you must have documentation showing they meet the IRS rules: a birth certificate or adoption papers, proof they lived with you for more than half the year, and proof of their income (or a statement that they had no income). You do not send these documents with your return, but you must keep them in case the IRS asks.

If you file electronically, your tax software will walk you through the dependent questions and calculate your exemptions automatically. If you file on paper, you will fill in the exemption section by hand.

State tax exemptions

Most states that have an income tax also allow exemptions, but the rules vary widely. Some states follow the federal rules closely; others have their own thresholds and phase-outs. A few states do not allow exemptions at all.

When you file your state return, you may need to claim exemptions separately from your federal return. Your state tax form will tell you which exemptions you can claim and whether they match the federal rules. If you live in a state with no income tax (such as Florida, Texas, or Wyoming), you do not file a state income tax return and do not claim state exemptions.

Frequently Asked Questions

Can I claim an exemption for my adult child?

Only if they meet the IRS definition of a dependent. They must be under 24 (or under 19 if not a full-time student), live with you for more than half the year, and have income below the annual threshold — roughly $4,700 in recent years. If they are older or earn more, you cannot claim them, even if you support them financially.

What happens if two parents claim the same child?

The IRS will flag both returns for review. Usually, the parent with custody gets the exemption, but you may need to provide documentation (such as a custody order) to prove it. Filing a claim you are not may have access to to can result in penalties and interest on unpaid taxes.

Do I lose my exemption if I get married mid-year?

No. Your filing status on December 31 of the tax year determines your exemption rules for that year. If you marry on December 30, you file as married for the whole year. If you divorce or separate, the rules depend on your status on the last day of the year.

Can I claim an exemption for a foster child?

Yes, if they lived with you for the entire tax year and you provided more than half their support. You do not need to be their legal guardian. Bring documentation showing they lived with you and that you paid for their food, housing, and other needs.

What if I was claimed as a dependent but I think I should not have been?

Contact the IRS at 1-800-829-1040 or file Form 14039 (Identity Theft Affidavit) if someone claimed you without permission. If someone else legitimately claimed you, you cannot also claim yourself on your return — only one person can claim you per tax year.