How much will I get back in taxes?
Your refund is what you paid in, minus your tax. Paid in means withholding, estimated payments, and refundable credits. In the example above, tax of $7,670 against $8,280 paid in leaves $610. If the second number is smaller, you owe the difference. Here, dropping to $5,800 withheld turns the refund into a $1,870 balance due.
Refund (or balance due) = withholding + estimated payments + refundable credits − total taxThe number on your latest pay stub is only part of the picture. This tool adds what's still to come: your withholding per check times the checks you have left. Then it compares that total with your tax for the year. If you only want to see how your tax is built up, bracket by bracket, the income tax calculator is the better page.
How do dependents change a tax refund?
Each child under 17 can bring a credit of up to $2,200 in 2026, which comes straight off your tax. For a couple earning $100,000, the tax falls by that full amount for each child, until it reaches zero.
| Children under 17 | Federal income tax |
|---|---|
| 0 | $7,640 |
| 1 | $5,440 |
| 2 | $3,240 |
| 3 | $1,040 |
| 4 | -$1,160 |
Part of the child credit is refundable, up to $1,700 per child and limited by earned income. A family earning $35,000 with two children would owe no income tax here and could receive $3,400 from the refundable part. If you can claim dependents and your withholding hasn't changed, a refund may just reflect that credit. Your W-4 Step 3 can apply it to your paychecks instead.
Why would I owe taxes when money is taken out of every check?
Withholding is only an estimate, and two common setups throw it off. The first is two jobs. Each employer withholds as if it's your only job, so each one gives you a full standard deduction and starts you in the low brackets.
Say you work two jobs paying $60,000 each, with neither W-4 adjusted. Each employer would withhold about $5,020, or $10,040 in all. Your tax on $120,000 is $17,570. You'd come up $7,530 short. A working couple filing jointly can have a similar gap. Enter combined wages and combined withholding here to see the real gap, and use Step 2 of Form W-4 to close it.
The second is income with no withholding: freelance work, interest, a gain. Self-employment income also brings its own tax, which our self-employment tax calculator works out. A bonus can have tax withheld at a flat 22%, too low if your top rate is higher. The bonus tax calculator shows that difference.
If you owe $1,000 or more and paid in less than the smaller of 90% of this year’s tax or 100% of last year’s (110% for higher incomes), an underpayment penalty can apply. Add last year’s tax under advanced options to test both.
How do I adjust my W-4 for the rest of the year?
Divide the gap by your remaining paychecks. In the balance-due example, $1,870 across 4 checks is $467.50 more per check. That goes in Step 4(c) of Form W-4 as extra withholding.
To lower withholding instead, the usual tool is Step 3. Payroll divides the Step 3 amount by your pay periods, according to Publication 15-T. So to cut $152.50 from each of your last 4 checks on a biweekly schedule, you'd enter about $3,965, which is that amount times 26.
The trap is January. These numbers are sized for the few checks left this year. A W-4 stays in effect until you replace it, so leaving this in place would badly over- or under-withhold next year. Replace it in January, using the IRS Tax Withholding Estimator.
A refund isn't free money, but it isn't a mistake either. It works like a savings account paying no interest. Some people prefer it as forced savings. On these numbers, $610 would be about $23.46 more in each check. Whether that matters is your call. If you carry card debt, it usually does.
Does this include the tips and overtime deductions?
Yes, if you enter them. For 2026, Publication 505 allows a deduction of up to $25,000 of qualified tips and $12,500 of qualified overtime ($25,000 on a joint return). In our example, $5,000 of qualified overtime lowers tax by $1,100.
Two details matter. Overtime means only the premium, the extra half in time and a half, as your W-2 reports it. And the deductions shrink above $150,000 of income ($300,000 joint). The publication we used doesn't give the reduction, so above those levels this tool applies none, which errs toward a smaller refund. You also need a joint return if married. These deductions don't reduce Social Security or Medicare tax.
How accurate is a tax refund calculator?
It's as accurate as your inputs and the rules it models. This is a simplified federal estimate. It doesn't model the following, so if any applies to you, expect a difference:
- The earned income credit, education credits, the premium tax credit, and the child and dependent care credit. You can enter credits you've worked out yourself.
- Capital gains rates, alternative minimum tax, and Additional Medicare Tax.
- State income tax, which is a separate return. See our state income tax calculator.
- Limits on itemized deductions. Enter your own allowed total.
For a check before you change anything, use the IRS Tax Withholding Estimator. A CPA or enrolled agent can look over a complicated year.
Common questions
Where do I find my federal withholding?
On your latest pay stub, look for federal income tax, year to date. At year end, it is box 2 of your W-2. Don't include Social Security or Medicare. Add the figures from all your jobs, and your spouse's if you file jointly.
Why is my refund smaller than last year?
Common reasons include a raise without a W-4 update, a new job, losing a credit, or a child turning 17. Run this with last year's numbers and this year's to see which input moves it.
Is this for the 2026 tax year?
Yes. It uses 2026 figures for returns filed in 2027. As of this writing, the IRS hasn't published its full 2027 figures, so we don't estimate that year.
Does a bigger refund mean I paid less tax?
No. Your tax is set by your income, deductions, and credits. Withholding only changes when you pay. A bigger refund means more was taken from your checks, unless a credit grew.
What if I have multiple W-2s?
Add all wages together and all withholding together. If the result is a balance due, the two-job gap above is the usual cause.
Should I aim for zero?
Zero means you kept your money through the year and won't owe. It's also easy to miss slightly, so some people aim for a small refund. Enter a target above to see the withholding for it. Our math is an estimate, so leave some room.
Sources
- Tax Withholding Estimator · Internal Revenue Service
- Form W-4, Employee’s Withholding Certificate, 2026 · Internal Revenue Service
- Publication 15-T, Federal Income Tax Withholding Methods · Internal Revenue Service
- Publication 505, Tax Withholding and Estimated Tax · Internal Revenue Service
- Form 1040-ES, Estimated Tax for Individuals, 2026 · Internal Revenue Service