Why a jackpot is taxed at close to 37%, but never quite all of it
Federal tax
The 37% bracket starts at $640,600 of taxable income for a single filer in 2026, so federal tax takes 36.5% of a $10,000,000 prize: close to the top rate, never all of it.
- 36.5%federal tax on $10,000,000
- 37%top rate
How Progressive Brackets Work
Federal income tax uses marginal brackets. Each portion of income is taxed at the rate for its specific tier. The first dollars are taxed at lower rates. Higher amounts are taxed at higher rates. The top rate applies only to income above a certain threshold. This structure ensures the average tax rate remains below the highest marginal rate. The table below shows how this applies to a large prize. It compares the total tax paid against the prize size. You can see the effective rate in the key figures. It is slightly lower than the top bracket rate. This difference exists because lower portions of income are taxed less heavily. Use the winnings tax calculator to estimate your specific situation.
| Prize | Federal tax | Share of the prize |
|---|---|---|
| $100,000 | 13,170 | 13.2% |
| $1,000,000 | 320,000 | 32.0% |
| $10,000,000 | 3,650,000 | 36.5% |
| $100,000,000 | 36,950,000 | 37.0% |
The Role of Thresholds
Income up to the first threshold pays the lowest rate. Income between thresholds pays intermediate rates. Only income above the final threshold pays the top rate. For a single filer, the top rate begins at a specific income level. Most of a large prize falls into lower brackets. These portions contribute less to the total tax bill. The top rate affects only the excess above the threshold. This creates a blended average rate. The average is pulled down by the lower brackets. The table above illustrates this distribution. It shows how different portions contribute to the total. The result is an effective rate below the top marginal rate.
Why the Average Rate Stays Lower
As a prize grows, more income falls into higher brackets. The average rate rises toward the top marginal rate. It never reaches it completely. The lower portions always pay less than the top rate. These portions keep the average below the maximum. Even with very large prizes, the effect persists. The gap between the average and top rate narrows but remains. This is inherent to progressive taxation. The key figures show this difference clearly. The effective rate is close to the top rate but distinct. It explains why the total tax is not simply the prize multiplied by the top rate.
Questions
Why is my effective tax rate lower than the top bracket?
Lower portions of your income are taxed at lower rates. These portions pull the average down. The top rate applies only to income above the highest threshold.
Does a larger prize always mean a higher effective rate?
Yes, generally. More income falls into higher brackets. The average rate rises toward the top marginal rate but stays below it due to lower bracket contributions.
How do marginal brackets affect my lottery winnings?
Each portion of your winnings is taxed at its specific bracket rate. The total tax is the sum of these portions. This results in an average rate below the top marginal rate.
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.