Tax Refund Estimator 2026

How to estimate your tax refund from a paycheck

You don't need your filed return to know roughly where you'll land. Your latest pay stub already carries the four numbers that matter: year-to-date gross pay, year-to-date federal income tax withheld, your current paycheck's gross, and how many pay periods are left in the year.

The logic is straightforward. Project the full year forward, work out the federal tax on that projected income, then compare it to the federal tax you'll have withheld by December. If your withholding comes out higher than your liability, you're on track for a refund. If it's lower, you'll owe the difference.

This tool works out your per-paycheck withholding from your year-to-date numbers (it divides your YTD federal tax by the number of checks implied by YTD gross and your current gross), so you don't have to re-enter it. That's what saves you from re-typing a single check's figures.

Refund vs. balance due: how the math works

Start with projected annual gross: your year-to-date gross plus your current gross multiplied by the pay periods remaining. Subtract any remaining pre-tax 401(k) contributions, since those lower your taxable wages. The 2026 federal brackets used here already build in the standard deduction at their first taxable threshold, so the projected figure flows straight into the bracket math.

From there, the tool runs your projected taxable income through the 2026 federal brackets to get tax before credits, then subtracts dependent credits ($2,000 per qualifying child under 17, $500 per other dependent), with the result floored at zero. That's your projected liability. Refund equals projected withholding minus projected liability. Positive means a refund; negative means a balance due.

Worth repeating: this is a federal income tax estimate only. Social Security and Medicare (FICA) are withheld separately and aren't refunded on a normal 1040, and state refunds vary too much to project from a single federal figure. For the payroll-tax side, the FICA Tax Calculator breaks it down.

Why your real refund may differ

A paycheck-based estimate is a strong ballpark for a steady W-2 paycheck, but a few things can move the real number. Mid-year raises and bonuses change your projected gross. Multiple jobs or side income add wages this tool doesn't see. Itemized deductions, education or energy credits, and Child Tax Credit phaseouts at higher incomes all shift liability.

The dependent credits here are applied at their full per-dependent amounts and floored at zero, so the refundable Additional Child Tax Credit and high-income phaseouts aren't modeled. Treat the output as a guide, and confirm details with the IRS or a tax professional before relying on it. To see exactly which bracket your income reaches, the Federal Tax Bracket Calculator and the Marginal vs Effective Tax Rate Calculator add context.

How to adjust your withholding before year-end

If the estimate shows a large refund, you're handing the IRS an interest-free loan. If it shows a balance due, you may want to top up before filing. Either way, the lever is your W-4: changing it adjusts how much federal tax comes out of each remaining paycheck.

The W-4 Withholding Estimator helps you set the per-check amount, and the 401(k) Contribution Calculator shows how pre-tax saving trims taxable income. Run this refund estimate again after any change to watch the projected refund or balance due move in real time.