Hong Life CalculatorsUnderstanding the Mega Millions payout calculator — concept and principle
This calculator shows what a Mega Millions jackpot could actually pay you. It compares the cash option with the 30-payment annuity after an estimate of federal and state income tax, so you can see what the advertised headline number turns into.
How it is calculated
- The advertised jackpot is the sum of 30 yearly payments, each larger than the last by a fixed increase g (5% by default). First payment = jackpot × g ÷ ((1 + g)^30 − 1); payment k = first × (1 + g)^(k − 1).
- Cash option after tax = cash − federal tax on the cash − state rate × cash.
- Each annuity payment is taxed on its own in the year it arrives, using the 2026 federal brackets (10% up to 37%, top rate above 640,600 USD single or 768,700 USD joint) plus your state rate.
- The last row compares total after-tax annuity with after-tax cash.
The principle
A lottery prize is ordinary income. Taking the cash puts almost all of it in the 37% bracket in one year. Annuity payments are also mostly taxed at 37%, but they arrive over 29 years, so the totals are not directly comparable: a dollar paid in year 30 is worth far less today. The ratio between the after-tax totals tells you how much more nominal money the annuity pays, not which choice is better.
Worked example
Default inputs: jackpot 800,000,000 USD, cash 360,000,000 USD, single filer, state tax 4%, increase 5%.
- Federal tax on the cash ≈ 133,155,957 USD; state tax = 4% × 360,000,000 = 14,400,000 USD.
- Cash after tax = 360,000,000 − 133,155,957 − 14,400,000 = 212,444,043 USD.
- First annuity payment = 800,000,000 × 0.05 ÷ (1.05^30 − 1) ≈ 12,041,148 USD, about 7,148,320 USD after tax.
- 30th payment = 12,041,148 × 1.05^29 ≈ 49,562,998 USD before tax.
- All 30 payments after tax ≈ 473,321,282 USD, which is 2.23× the after-tax cash.
| Cash value announced for the jackpot (USD) | Cash option after tax (USD) |
|---|---|
| 9e+07 | 53,144,043 |
| 1.8e+08 | 106,244,043 |
| 2.7e+08 | 159,344,043 |
| 3.6e+08 | 212,444,043 |
| 4.5e+08 | 265,544,043 |
| 5.4e+08 | 318,644,043 |
| 7.2e+08 | 424,844,043 |
How to read the result
The annuity's larger total is spread over three decades. To compare fairly, discount the payments at the return you could earn on the cash (the lottery annuity calculator does this). The cash option suits someone who can invest well and wants control; the annuity suits someone who wants guaranteed income and protection from spending too fast.
Common mistakes
- Treating the advertised jackpot as the amount you will receive.
- Assuming the 24% withheld at payout is the whole federal tax.
- Comparing nominal annuity totals with cash without discounting.
- Forgetting city taxes or that a few states do not tax lottery prizes.
Frequently asked questions
How much is the Mega Millions cash option?
It is announced with each jackpot and is typically roughly half or less of the advertised amount, depending on interest rates.
How many payments does the annuity have?
One immediate payment and 29 annual payments, 30 in total, each rising by a set percentage.
Which states do not tax lottery winnings?
Several states have no state income tax or exempt lottery prizes. Check your state's current rules before relying on a rate.
Sources: Mega Millions official game rules and prize payment information · IRS, Rev. Proc. 2025-32 (2026 tax rate schedules)