Tax Credits Overview
A credit reduces your tax dollar for dollar. A $1,000 credit saves $1,000 of tax, while a $1,000 deduction only saves your marginal rate on $1,000, which might be $120 or $220. That difference is why credits are the most valuable items on the return. There are two kinds, and the difference matters: nonrefundable credits can only reduce your tax to zero, while refundable credits can pay out beyond zero as part of your refund.
Refundable vs nonrefundable
A nonrefundable credit can bring your tax to $0 but no further. A refundable credit can produce a refund even when no tax is owed. Always check which kind a credit is before counting on it, because the same dollar amount can behave very differently.
How credits work
Credits are subtracted after your tax is calculated. First the brackets produce a tax figure, then nonrefundable credits reduce it, then refundable credits are added on top. If your tax is $2,000 and you have a $3,000 nonrefundable credit, your tax becomes $0 and the extra $1,000 is lost. If the $3,000 credit is refundable, your tax becomes $0 and you receive the extra $1,000 as part of your refund.
Many credits have income limits, age or relationship tests, and paperwork requirements. Claiming a credit you do not qualify for is one of the most common reasons for IRS notices, so the eligibility rules are worth reading in full on irs.gov before you claim.
Child Tax Credit and Earned Income Tax Credit
Two credits are so large that they have their own dedicated sites in this network, and this guide only mentions them briefly. The Child Tax Credit is up to $2,200 per qualifying child under 17 for tax year 2026, permanent under the One Big Beautiful Bill Act and indexed for inflation from 2026, with up to $1,700 refundable per child as the Additional Child Tax Credit. The full credit applies at modified AGI up to $200,000 single or $400,000 joint, and the refundable portion needs at least $2,500 of earned income, paying 15% of earned income above $2,500 up to the $1,700 cap. Full coverage is on CTC Decoded.
The Earned Income Tax Credit is for workers with low to moderate income. The maximum 2026 EITC is $8,231 for qualifying taxpayers with three or more qualifying children, up from $8,046 in 2025. Full coverage, including the income limits and the childless-worker rules, is on EITC Decoded. Refunds on returns claiming the Additional Child Tax Credit or the EITC are held until mid-February under the PATH Act, so those refunds arrive later than others.
Education credits
There are two main education credits. The American Opportunity Tax Credit is for the first four years of undergraduate study, and the Lifetime Learning Credit is for undergraduate, graduate, and professional courses. The Lifetime Learning Credit is not inflation-adjusted, and for 2026 it phases out at modified AGI of $80,000 to $90,000 for single filers and $160,000 to $180,000 for joint filers.
Education credits have their own tests: the student must be enrolled at an eligible institution, the expenses must be qualified tuition and related expenses, and the same expense cannot be used for two tax benefits at once. The institution's Form 1098-T is the starting point, but it is not the final word on what qualifies.
Saver's Credit, adoption credit, and energy credits
The Saver's Credit, formally the Retirement Savings Contributions Credit, rewards low- and moderate-income workers who save for retirement. For 2026 the income limits are $80,500 for joint filers, up from $79,000, $60,375 for heads of household, up from $59,250, and $40,250 for single filers and married filing separately, up from $39,500.
The adoption credit for 2026 covers up to $17,670 of qualified adoption expenses, up from $17,280 in 2025, and up to $5,120 of it may be refundable. Energy credits cover qualifying home improvements such as solar panels and energy-efficient upgrades, but the rules and amounts for energy credits have changed frequently in recent years, so the current IRS guidance for residential energy credits is the place to check before planning a purchase around one.
Claiming credits safely
Credits are claimed on the return or on the schedule that belongs to them, and most need the qualifying person's Social Security number and the right supporting forms. Keep the documents that prove eligibility, such as birth certificates, school records, and receipts, for at least three years after filing. If a credit is denied, the IRS explains why, and many denials come from a single failed test, such as income slightly over a limit or a child who does not meet the age test on the right date.
Because credits are worth a full dollar each, they are also the most audited part of the return. Claim every credit you qualify for, document it, and do not claim one you do not.
Sources: Internal Revenue Service, IR-2025-103 and Revenue Procedure 2025-32 (EITC maximum, adoption credit, Lifetime Learning phase-out), https://www.irs.gov/newsroom/irs-releases-tax-inflation-adjustments-for-tax-year-2026-including-amendments-from-the-one-big-beautiful-bill; IRS news release IR-2025-111, 13 November 2025 (Saver's Credit limits), https://www.irs.gov/newsroom/401k-limit-increases-to-24500-for-2026-ira-limit-increases-to-7500.