Tax Return Calculator 2026 — Federal Refund or Balance Due
Enter the numbers from your W-2 (or final pay stub) and a few details about your household. The calculator estimates your 2026 federal tax liability using current IRS brackets, applies the Child Tax Credit where you qualify, and compares your total federal tax to what you've already had withheld. The result is your projected refund or balance due for the return you'll file in early 2027.
Estimate your 2026 federal tax return
Breakdown
How the calculation works
The math behind your tax return is simpler than the form looks. There are four steps the IRS expects you to follow on Form 1040, and the calculator above runs the same four steps for you.
- Add up your income. Wages from the W-2, plus interest, dividends, capital gains, retirement distributions, and any other taxable amounts.
- Subtract the deduction. Either the 2026 standard deduction ($15,350 single, $30,700 MFJ, $23,100 HoH) or itemized deductions on Schedule A — whichever is larger.
- Apply the tax brackets. The remaining taxable income is split into bands and each band is taxed at its rate (10, 12, 22, 24, 32, 35, 37 percent for 2026). Long-term capital gains and qualified dividends are taxed separately at 0/15/20%.
- Subtract credits, then compare to what you've paid in. The Child Tax Credit ($2,000 per qualifying child under 17, phasing out above $200,000 single / $400,000 MFJ) reduces the tax directly. The result is your final liability. Subtract federal withholding and any estimated payments. Positive number = balance due. Negative = refund.
A worked example
Married couple, MFJ, two qualifying children. Combined wages $135,000, federal withholding $11,800, $400 of dividend income, $0 of long-term gains, $0 of estimated payments, taking the standard deduction.
- Gross income: $135,400
- Standard deduction (2026 MFJ): $30,700
- Taxable income: $104,700
- Federal ordinary tax: 10% × $24,300 + 12% × $74,650 + 22% × $5,750 = $2,430 + $8,958 + $1,265 = $12,653
- Child Tax Credit: 2 × $2,000 = −$4,000
- Tax liability after credits: $8,653
- Withheld: $11,800
- Refund: $3,147
What this calculator does not cover
The calculator handles the 80% of US returns that are wages, simple investment income, and the Child Tax Credit. It is not a substitute for software like TurboTax, FreeTaxUSA, or H&R Block when you have anything in the following list:
- Earned Income Tax Credit (EITC) — has its own phase-in/phase-out schedule by household composition.
- Education credits (American Opportunity, Lifetime Learning) — depends on tuition expenses and AGI phase-out.
- Itemized deductions beyond a single total — if you want to compare itemized line-by-line, use a full preparation product.
- Self-employment — see the Self-Employment Tax Calculator for the SE tax piece.
- AMT — rare in 2026 because of higher exemptions, but possible with large ISO exercises or high private-activity-bond interest.
- State and local tax — federal only. Run state tax separately via the State Income Tax Calculator.
Refund or balance due — what to do with the answer
If the calculator shows a big refund (say, more than $1,500), you're loaning money to the IRS interest-free. Increase your in-cheque pay by adjusting Form W-4 with your employer — fewer allowances on the old form, or higher "extra income" entries on the new one have the opposite effect; the simplest tweak is to enter a smaller extra withholding amount. The W-4 guide walks through the four sections.
If the calculator shows a balance due larger than $1,000, you may owe an underpayment penalty unless you fall under one of the safe harbours (paid in at least 90% of current-year tax, or 100% of prior-year tax — 110% if AGI is over $150,000). The fix is either more withholding now or starting quarterly estimated payments. The Quarterly Estimated Tax Calculator sets that up.