Mega Millions · Iowa · 3.8% state tax
Mega Millions after taxes in Iowa: payout calculator
The current Mega Millions jackpot is $345 million, with a cash value of $139.6 million. An Iowa winner would keep about $82.6 million as a lump sum after the 37% federal rate and Iowa’s 3.8% — or $204.2 million spread over 30 annuity payments.
Jackpot estimate as of October 4, 2026. These figures refresh automatically when a new jackpot is announced.
Calculate any Mega Millions jackpot in Iowa
Change the jackpot and the cash value follows at today’s ratio of 40%; you can also type the cash value yourself.
| Your win | Lump sum | Annuity (30 payments) |
|---|---|---|
| Before taxes | $139,600,000 | $345,000,000 |
| Federal tax (37%) | −$51,652,000 | −$127,650,000 |
| Iowa tax (3.8%) | −$5,304,800 | −$13,110,000 |
| You keep | $82,643,200 | $204,240,000 |
Lump sum: what an Iowa winner keeps
Take the cash option and you get the jackpot’s cash value — currently 40% of the advertised amount — in one payment. Federal tax takes 37%: the lottery withholds 24% when you claim, and the rest is due when you file. Iowa then takes its 3.8%.
| Lump sum | Amount |
|---|---|
| Cash value | $139,600,000 |
| Federal income tax (37%) | −$51,652,000 |
| Iowa state tax (3.8%) | −$5,304,800 |
| You keep | $82,643,200 |
Annuity: 30 payments over 29 years
The annuity pays the full advertised jackpot: one payment when you claim and 29 more once a year, each 5% bigger than the last. Each payment is taxed in the year you receive it, so an Iowa winner keeps about 59.2% of every check.
| Annuity | Before taxes | After taxes |
|---|---|---|
| Payment 1 (at claim) | $5,192,745 | $3,074,105 |
| Payment 10 | $8,055,652 | $4,768,946 |
| Payment 20 | $13,121,808 | $7,768,110 |
| Payment 30 (final) | $21,374,043 | $12,653,433 |
| All 30 payments | $345,000,000 | $204,240,000 |
See all 30 payments
| # | When | Before taxes | After taxes |
|---|---|---|---|
| 1 | At claim | $5,192,745 | $3,074,105 |
| 2 | Year 2 | $5,452,382 | $3,227,810 |
| 3 | Year 3 | $5,725,001 | $3,389,201 |
| 4 | Year 4 | $6,011,252 | $3,558,661 |
| 5 | Year 5 | $6,311,814 | $3,736,594 |
| 6 | Year 6 | $6,627,405 | $3,923,424 |
| 7 | Year 7 | $6,958,775 | $4,119,595 |
| 8 | Year 8 | $7,306,714 | $4,325,575 |
| 9 | Year 9 | $7,672,050 | $4,541,853 |
| 10 | Year 10 | $8,055,652 | $4,768,946 |
| 11 | Year 11 | $8,458,435 | $5,007,393 |
| 12 | Year 12 | $8,881,356 | $5,257,763 |
| 13 | Year 13 | $9,325,424 | $5,520,651 |
| 14 | Year 14 | $9,791,695 | $5,796,684 |
| 15 | Year 15 | $10,281,280 | $6,086,518 |
| 16 | Year 16 | $10,795,344 | $6,390,844 |
| 17 | Year 17 | $11,335,111 | $6,710,386 |
| 18 | Year 18 | $11,901,867 | $7,045,905 |
| 19 | Year 19 | $12,496,960 | $7,398,200 |
| 20 | Year 20 | $13,121,808 | $7,768,110 |
| 21 | Year 21 | $13,777,899 | $8,156,516 |
| 22 | Year 22 | $14,466,794 | $8,564,342 |
| 23 | Year 23 | $15,190,133 | $8,992,559 |
| 24 | Year 24 | $15,949,640 | $9,442,187 |
| 25 | Year 25 | $16,747,122 | $9,914,296 |
| 26 | Year 26 | $17,584,478 | $10,410,011 |
| 27 | Year 27 | $18,463,702 | $10,930,512 |
| 28 | Year 28 | $19,386,887 | $11,477,037 |
| 29 | Year 29 | $20,356,231 | $12,050,889 |
| 30 | Year 30 | $21,374,043 | $12,653,433 |
How Iowa taxes lottery winnings
Iowa has a flat income tax, so a lottery prize is taxed at 3.8% from the first dollar — about $3.8 million of every $100 million in cash value.
Iowa’s 3.8% is the 8th-lowest state tax on lottery winnings among the 37 states and D.C. that tax them.
Iowa moved to a flat 3.8% income tax in 2025.
On the current jackpot, Iowa takes $5.3 million of the lump sum — money a winner in Texas or Florida, which don’t tax lottery prizes, would keep.
Iowa vs. neighboring states
What the current Mega Millions jackpot’s lump sum is worth after taxes in Iowa and next door. Buying a ticket across the state line doesn’t get you out of Iowa’s tax: you generally owe it as a resident, with a credit for tax paid to the state that sold the ticket.
Mega Millions taxes in Iowa: common questions
How much would an Iowa winner keep from a Mega Millions jackpot?
About 59.2% of the cash value. Federal tax takes 37% and Iowa takes 3.8%, so an Iowa winner keeps about $59.2 million of every $100 million in cash. With the annuity, the same 59.2% applies to the full advertised jackpot, paid over 30 years.
Does Iowa tax lottery winnings?
Yes. Iowa taxes lottery winnings as income at a flat 3.8%.
Should an Iowa winner take the lump sum or the annuity?
It depends on what you’d do with the money. The lump sum pays the cash value now — recently around 40–45% of the advertised jackpot — and you keep about 59.2% of it after taxes in Iowa. The annuity pays the whole advertised jackpot over 29 years in 30 payments, each 5% larger than the last, taxed as you receive them. Take the cash if you’d invest it at least as well as long-term Treasury bonds pay; take the annuity if you want protection from spending it too fast.
How much tax is withheld when you claim a Mega Millions prize in Iowa?
The lottery withholds 24% for federal tax on any prize over $5,000. A jackpot puts you in the 37% bracket, so you’ll owe roughly another 13% when you file. Iowa may also withhold state tax when you claim; any balance of its 3.8% is due with your state return.
When is the Mega Millions drawing, and how much is a ticket?
Mega Millions draws every Tuesday and Friday at 11 p.m. Eastern. A ticket costs $5 — every play includes a built-in 2X to 10X multiplier on the non-jackpot prizes — and the odds of hitting the jackpot are 1 in 290,472,336.
Play it out
Numbers are the start, not the story. Play Mega Millions with the official odds and see how long a jackpot really takes — then take your after-tax Iowa figure into the planner and give every dollar a job: Treasuries, index funds, real estate, the house, the cars, family and giving, with a 30-year projection that shows whether the money lasts.