Tax write-offs for individuals fall into three groups that each save money in a different way: deductions that shrink the income you’re taxed on, above-the-line adjustments that lower your adjusted gross income directly, and credits that cut your tax bill dollar for dollar. For 2026, a single filer who claims nothing more than the standard deduction already shelters $16,100 of income from federal tax, and a married couple filing jointly shelters $32,200.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Everything below that is what you can add on top.
Deductions and Credits Are Not the Same Thing
A deduction reduces the income the IRS taxes. A credit reduces the tax itself. The gap between the two is larger than most people expect.
Take a single filer in the 22% bracket (taxable income between $50,400 and $105,700 in 2026) claiming a $1,000 write-off.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 As a deduction, that $1,000 saves $220 in tax. As a credit, it wipes $1,000 straight off the bill. Nearly five times the value for the same headline number.
Credits come in two flavors. A nonrefundable credit can bring your tax to zero but stops there. A refundable credit can push past zero and put money back in your hand. If you owe little tax to begin with, only a refundable credit is worth much to you.
The Standard Deduction Most People Take
The majority of filers claim the standard deduction rather than itemizing. For 2026, the amounts are:
- Single or married filing separately: $16,100
- Married filing jointly: $32,200
- Head of household: $24,150
These figures come from IRS inflation adjustments that incorporate changes made by the One, Big, Beautiful Bill Act.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Taxpayers who are 65 or older or blind qualify for an additional amount on top.
You have to choose between the standard deduction and itemizing. Itemizing only pays off if your qualifying expenses add up to more than the standard amount for your filing status. For a married couple, that’s more than $32,200 in deductible expenses before a single dollar of tax savings appears.
Itemized Deductions Worth Adding Up
State and Local Taxes
The state and local tax deduction (SALT) covers property taxes plus either state income taxes or state sales taxes. Under the One, Big, Beautiful Bill Act, the SALT cap for 2026 is $40,400, up from the $10,000 cap that had been in place since 2018.2cloud.house.gov. Frequently Asked Questions: Tax Changes 2026 and the One Big Beautiful Bill The cap is $20,000 for married individuals filing separately, and it’s subject to a modified adjusted gross income limitation.3Internal Revenue Service. Topic No. 503, Deductible Taxes The higher cap alone pushes many homeowners in high-tax states past the standard deduction line for the first time.
Mortgage Interest
Homeowners can deduct interest paid on up to $750,000 of mortgage debt used to buy, build, or substantially improve a primary or secondary residence ($375,000 if married filing separately). Mortgages taken out before December 16, 2017, qualify under the older $1 million limit.4Internal Revenue Service. Publication 936 – Home Mortgage Interest Deduction Mortgage interest paired with the higher SALT cap is what tips most homeowners into itemizing.
Medical and Dental Expenses
Out-of-pocket medical and dental costs that exceed 7.5% of your adjusted gross income are deductible. If your AGI is $80,000, only the medical bills above $6,000 count. That 7.5% floor is now permanent and won’t revert to the 10% floor that applied before 2017.
Charitable Contributions
Cash donations to qualifying public charities are deductible up to 60% of your AGI. Donations to private foundations are capped at 30%. Gifts of appreciated property carry their own limits. For anyone who itemizes, the deduction effectively reduces the real cost of a donation by your marginal tax rate.
Above-the-Line Write-Offs You Can Claim Without Itemizing
Some deductions reduce adjusted gross income directly, whether or not you itemize. Because a lower AGI can also open the door to other tax benefits that phase out at higher incomes, these are worth grabbing whenever you qualify.
Traditional IRA Contributions
The traditional IRA contribution limit for 2026 is $7,500, plus a $1,100 catch-up if you’re 50 or older.5Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 If neither you nor your spouse is covered by a workplace retirement plan, the full contribution is deductible. If you are covered, the deduction phases out at higher income levels.6Internal Revenue Service. IRA Deduction Limits Few write-offs simultaneously cut this year’s tax bill and build retirement savings.
Health Savings Account Contributions
If you’re enrolled in a high-deductible health plan, HSA contributions are deductible above the line. For 2026, the limit is $4,400 for individual coverage and $8,750 for family coverage.7Internal Revenue Service. Notice 26-05 – 2026 HSA Limits HSAs get a triple tax advantage: contributions are deductible, the balance grows tax-free, and withdrawals for qualified medical expenses come out tax-free.
Student Loan Interest
You can deduct up to $2,500 of interest paid on qualified student loans, even when you take the standard deduction.8Internal Revenue Service. Topic No. 456, Student Loan Interest Deduction The deduction phases out at higher incomes, and the loan has to have been used solely for qualified education expenses.
Credits That Pay Off More Than Deductions
Because credits reduce tax dollar for dollar, they’re where the biggest savings usually come from.
Child Tax Credit
The Child Tax Credit for 2026 is worth up to $2,200 per qualifying child under 17. Up to $1,700 per child is refundable, meaning it can generate a refund even when your tax liability is already zero. Starting in 2026, these amounts are indexed for inflation.
American Opportunity Tax Credit
The American Opportunity Tax Credit provides up to $2,500 per eligible student for the first four years of postsecondary education. It’s partially refundable: once the credit reduces your tax to zero, 40% of what’s left (up to $1,000) comes back to you as a refund.9Internal Revenue Service. American Opportunity Tax Credit That refundable piece makes it useful for students and parents with low tax bills.
Earned Income Tax Credit
The EITC is fully refundable and aimed at low- to moderate-income workers. The amount depends on income, filing status, and number of qualifying children, with workers who have three or more children receiving the largest credit. Full refundability means the EITC can produce a real refund even when no income tax is owed at all.
Documentation the IRS Will Actually Accept
Every write-off has to be backed by records that show the amount, purpose, and date of the expense. Receipts, invoices, bank statements, and canceled checks are the baseline. The IRS will not take your word for it during an examination.
The general statute of limitations for the IRS to assess additional tax is three years from the date you filed (or the due date, whichever is later). If you understated gross income by more than 25%, the window stretches to six years.10Internal Revenue Service. Time IRS Can Assess Tax Keep supporting records for at least three years after filing.
What Happens if a Write-Off Gets Disallowed
Claiming a deduction or credit you weren’t entitled to costs more than the deduction itself. The IRS charges an accuracy-related penalty of 20% on the portion of the underpayment caused by negligence, disregard of the rules, or a substantial understatement of income tax.11Internal Revenue Service. Accuracy-Related Penalty If the IRS knocks out a $10,000 deduction that saved you $2,200, you owe the $2,200 back plus a $440 penalty, plus interest from the original due date.
A substantial understatement generally means the understated tax exceeds the greater of 10% of the correct tax or $5,000. The penalty can often be avoided by showing reasonable cause and good faith, or by adequately disclosing the position on the return. Aggressive claims with thin documentation are where most trouble starts, and interest accruing during a dispute usually costs more than the penalty itself.