How the tax refund calculator works
A refund is not a bonus; it is the difference between what your employer withheld during the year and what you actually owe. This calculator estimates the tax owed for 2026 from your income, filing status, deductions, and dependents, then compares it to the withholding you enter. A positive result is a refund and a negative result is a balance due on the return you file in 2027.
Formula
Taxable income = Income - Pre-tax contributions - Deduction (standard or itemized, whichever is larger). Tax = taxable income through the 2026 brackets. Tax after credits = Tax - nonrefundable credits, not below zero. Refund = Withheld + Refundable credits - Tax after credits.
Worked example: $60,000, single, $6,000 withheld
| Step | Amount |
|---|---|
| Income | $60,000.00 |
| Standard deduction | -$16,100.00 |
| Taxable income | $43,900.00 |
| Tax (10% on $12,400 + 12% on $31,500) | $5,020.00 |
| Federal tax withheld | $6,000.00 |
| Refund | $980.00 |
Withholding of $6,000 exceeds the $5,020.00 owed, so the filer gets $980.00 back. If only $4,000 had been withheld, the same filer would owe $1,020.
Example with the child tax credit: $90,000, married, two children, $4,000 withheld
| Step | Amount |
|---|---|
| Taxable income ($90,000 - $32,200) | $57,800.00 |
| Tax before credits | $6,440.00 |
| Child tax credit (2 x $2,200) | -$4,400.00 |
| Tax after credits | $2,040.00 |
| Withheld | $4,000.00 |
| Refund | $1,960.00 |
Why refunds happen
Employers withhold federal tax from each paycheck using the IRS percentage tables and the information on your W-4. Those tables assume your pay is steady all year and that you take the standard deduction. Anything that breaks those assumptions changes the outcome: a raise partway through the year, a second job, a bonus withheld at the flat 22% supplemental rate, a new child, or itemized deductions that the W-4 did not know about. The refund or balance due is simply the year-end correction for all of those differences.
How to adjust your withholding
If the estimate shows a large refund, you can increase every paycheck by filing a new W-4 with your employer. Step 3 of the form lets you claim $2,200 per child and $500 per other dependent, which lowers withholding by that amount over the year. If the estimate shows a balance due, add an extra dollar amount in Step 4(c) so the shortfall is spread across the remaining paychecks. Underpaying by more than $1,000 can trigger an underpayment penalty unless you withheld at least 90% of this year's tax or 100% of last year's (110% for higher incomes).
Credits and deductions in this estimate
| Item | 2026 amount | Notes |
|---|---|---|
| Standard deduction | $16,100 single, $32,200 joint, $24,150 head of household | Used unless itemized is larger |
| Child tax credit | $2,200 per child under 17 | Up to $1,700 refundable; phases out above $200,000 / $400,000. Estimated for 2026. |
| Credit for other dependents | $500 | Nonrefundable |
| Refundable limit | 15% of earned income over $2,500 | Caps the additional child tax credit |
Not modeled: the earned income tax credit, education credits, the saver's credit, self-employment tax, capital gains rates, and the alternative minimum tax. If any of those apply, treat the result as a starting point rather than a final number.