Tax refund estimator

The box that ruins this calculation

Your W-2 has four withholding boxes and only two of them belong here. Box 2 is federal income tax withheld and box 17 is state. Boxes 4 and 6 are Social Security and Medicare — those are not advance payments of anything, they buy entitlements, and no part of them comes back as a refund.

Add them in by mistake and on a typical salary you will overstate your refund by several thousand dollars. It is the commonest error people make doing this by hand, which is why the fields above say which box to read rather than just asking for “tax withheld”.

What a refund actually is

It is your own money coming back, without interest, after up to a year. That framing matters because the entire category is built on treating it as a windfall. A $3,600 refund is $300 a month you could have had as you earned it — and the way to move it is a new W-4 with your employer, not a different calculator.

Some people genuinely prefer it as forced saving, and that is a reasonable position. It is just worth making it a decision rather than an accident of whatever you wrote on a form when you started the job.

A refund is your own money coming back

A refund is not a payment from the government and not a reward for filing correctly. It is the difference between what was withheld from your pay across the year and what you actually owed — your money, returned without interest, after the IRS has held it for up to sixteen months.

That framing changes what a large refund means. The average US refund runs around $3,000; on $85,000 of salary, over-withholding by that much is roughly $115 a fortnight lent at zero interest for an average of six months. It is not a mistake — plenty of people choose it as forced saving — but it should be a choice, and correcting it is a W-4 change rather than anything done on the return.

A bill in April means the reverse and is not automatically a problem either. Under-withholding is only penalised when it is large: the safe-harbour rules generally protect you if you paid at least 90% of this year's tax or 100% of last year's — 110% at higher incomes — through withholding or estimated payments. Inside that, owing money in April simply means you kept it longer.

Refundable credits are the exception to "your own money". The Earned Income Tax Credit and the refundable portion of the Child Tax Credit can pay out more than was withheld, which is genuinely money arriving rather than returning. They are also the reason some low-income filers should file even when no tax was owed and no return was required.

What the estimate on this page does is compute the liability side properly — $16,373 of total federal tax on $85,000 single — so that the subtraction against what you had withheld is being made from a correct number.

The five errors that make a refund estimate wrong

Adding FICA to what was withheld. Boxes 4 and 6 of a W-2 are Social Security and Medicare — $6,503 of them on $85,000. They are not prepayments of income tax and never come back as a refund. Only box 2 (federal) and box 17 (state) belong in the subtraction, and including the others overstates the refund by thousands. It is the single commonest error in this category.

Estimating from one payslip. A year-to-date figure part-way through the year is not the annual figure, and multiplying a fortnight by twenty-six misses every bonus, raise, unpaid week and benefit change. Use the final payslip of the year, or the W-2 itself once it arrives.

Forgetting the second income. Each employer withholds as though its salary were your only one, applying the standard deduction and the lowest brackets twice over. A household with two jobs and no W-4 adjustment is usually under-withheld, and the estimate that assumed a refund produces a bill.

Counting a credit as a deduction. A $2,000 deduction saves you your marginal rate on $2,000; a $2,000 credit saves $2,000. At 22.00% that is a difference of $1,560 on a single item, and treating one as the other is why estimates land far from the eventual figure.

Ignoring state and local. State refunds are computed separately, on a different base, with different credits — and in eleven states a city or county withholds as well. We have loaded 3,672 of those local jurisdictions, because a "federal refund" estimate quietly presented as the whole picture is not an estimate of anything anyone actually receives.

Who ends up owing, and when that costs a penalty

Four situations produce a bill rather than a refund with dull regularity: a second job in the household with no W-4 adjustment, self-employed or freelance income alongside a salary, investment income that nothing withholds against, and a year where a bonus was under-withheld at the flat supplemental rate.

Owing is not itself penalised. The safe harbour generally protects you if withholding and estimated payments covered at least 90% of this year's tax or 100% of last year's — 110% where the prior year's income was above $150,000. Inside that, a balance due in April simply means you held your own money longer, which is the better side of the trade.

Outside it, the underpayment penalty is computed quarterly, which catches people who fix the problem late. Income earned in the first quarter needed paying in the first quarter, and a large fourth-quarter catch-up does not undo the earlier shortfall. Withholding is the exception and the reason a W-4 change beats an estimated payment: withheld tax is treated as paid evenly across the year regardless of when it was actually withheld.

Self-employment is where this bites hardest, because there is no employer withholding anything and the tax includes both halves of FICA. On top of income tax that is another 15.30% of net earnings up to the wage base — the largest single difference between a salary and the same money invoiced, and the commonest reason a first year of freelancing ends with an unaffordable April.

The fix for a salaried worker is Step 4(c) of the W-4 and takes one form. On $85,000 with a total federal liability of $16,373, covering a $1,500 shortfall costs $58 a fortnight — trivial spread across a year, painful in a single April.

The credits that pay out more than you paid in

Most tax relief is either a deduction, which reduces the income you are taxed on, or a non-refundable credit, which reduces tax to zero and stops there. A refundable credit is the third kind: it can pay out beyond what you owed, which makes it the only mechanism by which a return produces more money than was withheld.

The Earned Income Tax Credit is the largest of them and reaches working households with modest incomes, scaling with earnings and with the number of children. It is also the most under-claimed major credit in the system — the IRS estimates a fifth of eligible households do not claim it — mainly because people whose income was low enough to owe nothing assume there is no reason to file.

The Child Tax Credit is partly refundable, so a household owing little tax can still receive part of it. The American Opportunity Credit for education is 40% refundable up to a cap. Several states run their own versions of the EITC as a percentage of the federal one, and those percentages move with legislation — Oregon's is 9%, which we corrected from a compiled source that published 17%.

The practical consequence: if your income was low enough that no tax was owed and no return was required, filing is still frequently worth it, and the amount at stake is usually in the thousands rather than the hundreds. A refund estimate that only subtracts withholding from liability misses this entirely, because it assumes the floor is zero.

When the money actually arrives

Filing season opens in late January and the deadline is 15 April, moving to the next business day when it falls on a weekend or holiday. Filing early does not get you processed before the season opens, but it does put you at the front of the queue rather than in the March crush.

Electronic filing with direct deposit is the fast path — the IRS guidance is generally within twenty-one days, and most straightforward returns land well inside that. A paper return, or a refund sent as a cheque, moves in weeks rather than days, and paper returns filed close to the deadline are the slowest combination available.

Two things reliably delay a refund by statute rather than by workload. Returns claiming the Earned Income Tax Credit or the Additional Child Tax Credit cannot be paid before mid-February, whenever they were filed — an anti-fraud provision, not a review of your return. And any mismatch against employer-reported figures, a name or Social Security number that does not match, or a suspected identity issue moves a return to manual handling.

An extension extends the time to file, never the time to pay. Filing Form 4868 gives until 15 October to submit the return, while any tax owed was still due in April and accrues interest and penalties from then. It is a useful tool for missing paperwork and a poor one for missing money.

Amending is available for three years from the original due date, which matters when you discover a credit you did not claim. The refund from an amended return takes considerably longer — months rather than weeks — because it is processed by hand.

Your state refund is a separate calculation

Forty-two states and the District of Columbia tax income, and each computes its own refund on its own base with its own credits. A state return can produce a refund while the federal one produces a bill, or the reverse, because the two start from different taxable income and apply entirely different relief.

The base differs first. Most states begin from federal adjusted gross income and then add back or subtract items of their own — municipal bond interest, retirement income, Social Security benefits, state-specific deductions. A state that exempts pension income entirely and one that taxes it in full produce very different bills from the same federal return.

Credits differ more. Several states run their own earned income credit as a percentage of the federal one, property tax circuit-breakers that refund part of a property bill through the income tax return, and renter's credits that do the same for tenants. These are frequently unclaimed because nothing prompts for them, and they are refundable in several states — meaning they pay out even when no state tax was owed.

Then there is the local return. Eleven states allow a city, county or school district income tax and several of them require their own filing separate from the state's — Ohio municipalities most notably, where a resident working in another municipality files in both and claims a credit that is sometimes only partial. 3,672 such jurisdictions are loaded here.

And state figures go stale faster than federal ones. Of the 37 states checked against their own department of revenue, 12 carried a wrong rate, threshold or credit in the compiled sources — including one state whose earned income credit was published at nearly twice its statutory value.

What you need before the estimate becomes a return

A W-2 from every employer, which must be issued by 31 January. If you worked three jobs you need three, and filing from two of them is the most reliable way to trigger a mismatch against what the IRS has already been told.

A 1099-NEC for freelance work, a 1099-INT for bank interest, a 1099-DIV for dividends, a 1099-B for investment sales, a 1099-G for unemployment benefits — which are taxable and surprise people every year. Brokerage forms are the ones that arrive late and get corrected, sometimes into March, and filing before a corrected 1099 lands means amending later.

A 1098 for mortgage interest and a 1098-T for tuition if either applies. Records of estimated payments made during the year, which nobody sends you and which are entirely your responsibility to have tracked.

And last year's return, which is more useful than it looks: it gives the prior-year tax figure the safe-harbour rule needs, carries forward capital losses and certain credits, and is what identity-verification questions are drawn from.

An estimate needs only two numbers — total income and total withheld. A return needs all of the above, and the gap between the two is why an estimate in January and a return in March can differ without either being wrong.

Questions

How is a tax refund calculated?

It is a subtraction, not a reward. Your employer withholds an estimate of your tax from every paycheck across the year. At filing you work out what you actually owed. If the withheld total is larger, the difference comes back; if it is smaller, you pay the difference. That is the whole mechanism.

Which box on my W-2 is the withholding?

Box 2 for federal income tax and box 17 for state. Do not add boxes 4 and 6 — those are Social Security and Medicare, which are not advance payments of income tax and never come back as a refund. Including them is the most common error in this calculation and it will overstate your refund badly.

Why is my refund smaller this year?

Usually because something changed on your side rather than in the law. A pay rise pushes more income into a higher bracket while withholding may not have kept pace. A new W-4, a second job, a spouse starting work, or a bonus taxed at the flat supplemental rate all move the figure. Bracket thresholds and the standard deduction also rise each year — $16,100 single for 2026 — which changes the arithmetic even at the same salary.

Is a big refund a good thing?

Financially, no. A refund is your own money returned without interest after up to a year. A $3,600 refund is $300 a month you could have had as you earned it. The fix is a new W-4 with your employer, not a different calculator. Plenty of people prefer the forced saving, and that is a legitimate choice — but it is a choice, not a windfall.

Can I get back more than I paid in?

Yes, through refundable credits — the Earned Income Tax Credit and the refundable portion of the Child Tax Credit are the big ones. They can produce a refund larger than your total withholding. This calculator does not model them, so if you qualify for either, your real refund will be higher than the figure here. We would rather tell you that than quietly guess.

Does the state refund work the same way?

Yes, but it is a separate calculation with separate money. 42 jurisdictions levy an income tax, each with its own brackets and deduction, and your state refund arrives separately from the federal one and usually on a different timetable. The calculator above works out both and shows them apart, because they are.

When will I get it?

The IRS says most refunds arrive within 21 days of an electronically filed return with direct deposit, and it publishes a "Where's My Refund" tracker. Paper returns take considerably longer. Returns claiming the EITC or the Additional Child Tax Credit are held by law until mid-February regardless of when you file.