Like other large US lottery jackpots, Mega Millions offers a choice between an annuity paid over years and a lower immediate lump-sum “cash value” — this models that choice alongside tax withholding.
How it works
The advertised jackpot is multiplied by an adjustable cash-value percentage to estimate the lump sum, then federal (24% mandatory) and state withholding are subtracted to estimate the net payout.
What this does not include
This does not include a fixed cash-value percentage — it moves with prevailing interest rates, so check the official cash-value estimate for the specific draw rather than relying on this calculator’s default alone.
How to use this calculator
- Enter the advertised jackpot, the cash-value percentage, and your state’s withholding rate.
Frequently asked questions
Why is the cash value lower than the advertised jackpot?
The advertised jackpot is the total of an annuity paid out over roughly 30 years; taking it as a lump sum today means forgoing the time value of that future money, which lowers the immediate cash amount.
Is 24% the final tax rate on lottery winnings?
No — it’s the mandatory withholding rate at the time of payout; a jackpot this size often pushes a winner into a higher bracket, meaning more tax can be owed when filing.
Is this the same calculation as the site’s Powerball calculator?
Yes, same underlying lump-sum-vs-annuity structure — built as a separate page since Mega Millions and Powerball are distinct games people search for by name.
