Iowa lottery tax · 3.8% state rate
Iowa taxes a jackpot at 3.8%. Here is what survives it.
Claiming in Iowa means federal tax at 37% and a final state rate of 3.8% — on the cash value, not the advertised jackpot. Same ticket, a different state, a different life.
Claimed in Iowa, after tax
What you’d actually keep of a $800M Mega Millions jackpot, taken as cash, claimed in Iowa. The other $140.4M is tax.
Line by line
| Advertised jackpot (Mega Millions) | $800M |
|---|---|
| Cash value — what the prize really is | $344.2M |
| Federal income tax (top bracket 37%) | −$127.3M |
| Iowa at 3.8% | −$13.1M |
| What lands in your account | $203.8M |
The lottery withholds 24% up front. The top federal bracket is 37% — the remaining 13% comes due on your return, which is where people get caught. The advertised jackpot is the headline number, paid out over 30 years; every figure here is the cash value — the lump sum you’d actually be paid. Figures assume a single winner in the top bracket and no other income.
Price it for you
Iowa carries over — you won’t re-enter it.
Priced for Iowa
Iowa leaves you $203.8M. What would you actually do with it?
We can carry this straight through: Iowa is already selected on the other side. Name the people, choose the houses, set what you’d live on — and see the life those choices come to.
About four minutes. Free, and no account until you want to save it.
The 24% withheld is not the bill
The lottery withholds 24% federal at the moment you claim. The top federal bracket is 37%, and a jackpot puts you there instantly — so roughly 13% of the cash value is still owed when you file.
On this $344.2M cash value that gap is about $44.7M. It is the single most common surprise for winners, and it is entirely predictable.
The same win, 46 places
cash option · Mega Millions at $800MRates are each state’s final income-tax rate on lottery prizes for a single filer claiming in that state — the total state liability, not the amount withheld at claim — applied to the cash value. Every row is state-only. New York City and Yonkers residents owe a local tax on top of New York’s state rate; it is computed in the configurator on Someday’s New York page, never in this table.
The advertised jackpot is not the check. The lump-sum cash value runs well below the headline number, federal tax takes its bite, and what happens next depends on your state. Here is Iowa's slice, computed by the same engine that powers the app.
Compared with a no-tax state like Florida, the state levy costs $13.1M on the current $344.2M cash value.
Next drawing: Tue, Jul 28
Advertised jackpot: $800M — that’s the 30-year annuity total, not the cash.
Cash value: $344.2M. After federal and state taxes, you’d keep between $179.4M and $216.9M, depending on your state.
Updated after the July 24 drawing.
Iowa taxes lottery winnings at a final state rate of 3.8% on top of federal tax — verified against official state sources on July 13, 2026.
More: Lottery taxes by state · Powerball after taxes · Mega Millions after taxes
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The actual question
What would you do if Someday comes?
Your state is already priced in. All that’s left is the part that’s actually about you.
Start with Iowa →Someday is real math about an imaginary win — for entertainment purposes only. We don’t sell tickets.
Estimates for entertainment purposes, not tax advice. Rates from public sources; your actual outcome depends on your full tax situation. Figures use the top federal bracket of 37% and each state’s final rate on winnings; your own bill depends on your full return. State rates verified against official state sources on July 13, 2026. Someday does not sell lottery tickets and is not affiliated with Powerball, Mega Millions, or any state lottery.