Why the 24% the lottery withholds is not the whole tax on a big prize

Federal tax2026-09-29

On a $1,000,000 lottery prize a single filer with no other income owes about $320,000 of federal tax in 2026, but the lottery withholds $240,000: about $80,000 is still due with the return.

• $320,000federal tax on the prize
• $240,000withheld at 24%
• $80,000still due

Withholding Is a Prepayment

The lottery withholds a fixed portion of your prize immediately. This amount acts as a prepayment toward your annual tax liability. It is not the final total owed. The table below shows how the withheld sum compares to the estimated total tax for a single filer with no other income. The withheld figure covers only part of the obligation. The remaining balance becomes due when you file your return. This structure ensures the government receives funds throughout the year rather than all at once. You must account for the difference between the withheld amount and the calculated total. The gap represents the additional tax required to satisfy your liability under current rules.

Higher Brackets Apply to Large Prizes

As the key figures show, a large prize pushes income into higher federal tax brackets. The lottery withholds a flat 24% of the whole prize, but the tax itself climbs through the brackets: taxable income above $201,775 for a single filer is taxed at 32%, then 35% and 37%. The bigger the prize, the larger the share of it taxed above the withholding rate. The table above illustrates this step-up in liability. A single filer sees the marginal rate increase across tiers. The withheld amount does not adjust for these higher tiers automatically. Consequently, the initial deduction falls short of the total estimated tax.

Small Prizes May Yield Refunds

Smaller prizes behave differently under the same rules. When the prize and your other income stay within the lower brackets, 24% can be more than the tax the prize adds, and the excess comes back as a refund. The excess withheld is returned after filing. This outcome depends on total annual income and filing status. The fixed withholding rate does not always match the precise liability for modest amounts. Over-withholding leads to refunds, while under-withholding requires additional payments. Both outcomes stem from the same calculation method applied to different income levels.

Planning for the Balance

Set aside the difference between the withheld amount and the estimated total tax. This reserve covers the remaining liability due with your return. Do not spend the entire net prize immediately. The remaining balance is not optional. It is part of the total obligation. Use the calculator to estimate this gap accurately. The figures provided are estimates for a single filer in current tax years. Tax laws change, so verify current rules when filing. Keeping funds separate prevents surprises at tax time. This approach aligns your cash flow with your liability schedule. It ensures you meet obligations without needing to borrow funds later.

Questions

Every figure on this page is computed by code from the 2026 federal and state brackets applied band by band and checked against a cumulative table. See the methodology.