The definitions
The IRS states them in one line each. A deduction is an amount you subtract from your income when you file so you don't pay tax on it. A credit is an amount you subtract from the tax you owe. Everything else follows from where in the calculation each one lands:
- Gross income, minus adjustments, gives adjusted gross income (see AGI vs MAGI).
- AGI minus the standard deduction or itemized deductions gives taxable income. Deductions act here.
- The brackets turn taxable income into tax.
- Credits come off that tax. Credits act here.
What each one is worth
Because a deduction only removes income from the top of the pile, it saves the tax that income would have paid: the amount times your marginal rate. A credit is subtracted after the tax is known, so it is worth its face value. The table runs the same $2,000 both ways for a single filer in 2026 with only the standard deduction.
| Gross wages | Marginal bracket | Tax before | $2,000 deduction saves | $2,000 credit saves |
|---|---|---|---|---|
| $40,000 | 12% | $2,620 | $240 | $2,000 |
| $85,000 | 22% | $9,870 | $440 | $2,000 |
| $220,000 | 32% | $41,704 | $640 | $2,000 |
Two things stand out. The deduction is worth more to the higher earner, $640 against $240, because the income it removes would have been taxed at a higher rate; a credit is worth the same $2,000 to everyone who owes at least that much. And a deduction can never be worth its own face value: at the top rate of 37 percent, $2,000 of deduction saves at most $740.
Refundable and non-refundable credits
A credit can only cut tax that exists, unless it is refundable. The IRS describes refundable credits as ones that can give you money back even if you don't owe any tax. The child tax credit is partly refundable: of the $2,200 per child in 2026, the IRS says up to $1,700 can come back as the additional child tax credit, depending on income (see the child tax credit guide). The earned income tax credit, in the IRS's words, can reduce the taxes you owe and maybe increase your refund. The credit for other dependents, by contrast, is a non-refundable credit of up to $500: it can reduce tax owed but is not paid out.
For a taxpayer whose tax is already small, this ordering matters more than the deduction-versus-credit question. A single filer earning $40,000 owes $2,620 before credits in 2026; a non-refundable credit larger than that is partly wasted, a refundable one is not.
The common examples
| Kind | Examples | Where it acts |
|---|---|---|
| Adjustment to income | Deductible traditional IRA contribution, HSA contribution, student loan interest, half of self-employment tax | Before AGI; no need to itemize |
| Standard deduction | $16,100 single, $32,200 joint, $24,150 head of household in 2026 | AGI to taxable income |
| Itemized deduction | Mortgage interest, state and local taxes, charitable gifts, large medical expenses | AGI to taxable income, instead of the standard deduction |
| Non-refundable credit | Credit for other dependents (up to $500 per dependent) | Reduces tax, not below zero |
| Refundable credit | The additional child tax credit (up to $1,700 per child), the earned income tax credit | Reduces tax and can produce a refund |
On the paycheck
Deductions and credits both reach the paycheck through withholding. Pre-tax deductions such as a 401(k) deferral lower the wages tax is withheld on at once, which is why the 401(k) calculator shows a smaller drop in take-home pay than the contribution itself. Credits are settled on the return, unless you tell your employer about them on Form W-4, which lowers the withholding during the year instead of producing a refund in the spring. The paycheck calculator shows the withholding for a given salary and state, and the percentage calculator turns a deduction and a bracket into the tax it actually saves.
Frequently asked questions
What is the difference between a tax deduction and a tax credit?
The IRS puts it in two sentences: a deduction is an amount you subtract from your income when you file, so you do not pay tax on it, and a credit is an amount you subtract from the tax you owe. A deduction is worth your marginal rate times the amount; a credit is worth its face value.
Which is worth more, a $2,000 deduction or a $2,000 credit?
The credit, always. A $2,000 deduction saves $2,000 times your marginal rate, between $200 and $740 depending on the bracket. A $2,000 credit takes $2,000 off the tax itself, as long as you owe at least that much or the credit is refundable.
What is a refundable credit?
A credit that can give you money back even if you do not owe any tax, in the IRS's words. The refundable part of the child tax credit and the earned income tax credit are the common ones. A credit that is not refundable can only bring the tax down to zero; any unused part is lost or, for a few credits, carried forward.
Do I have to itemize to get a credit?
No. Credits are claimed on the return regardless of whether you take the standard deduction or itemize. Itemizing only matters for the itemized deductions themselves, which are the ones compared against the standard deduction.
Are adjustments the same as deductions?
Adjustments to income, such as deductible IRA contributions and student loan interest, work like deductions in that they reduce the income that is taxed, but they come off before adjusted gross income is computed and are available whether or not you itemize. The guide on AGI and MAGI shows where they sit.
Sources
- IRS: Credits and deductions for individuals ("A deduction is an amount you subtract from your income when you file so you don't pay tax on it"; "A credit is an amount you subtract from the tax you owe"; refundable credits can give you money back even if you don't owe any tax)
- IRS Revenue Procedure 2025-32: 2026 tax rate tables, standard deduction and child tax credit (PDF)
- IRS Tax Topic 501: Should I itemize?
- IRS: Child Tax Credit (up to US$2,200 per child; the additional child tax credit is a refundable part of up to US$1,700; the credit for other dependents is non-refundable, up to US$500)
- IRS: Earned Income Tax Credit (can reduce the taxes you owe and maybe increase your refund)