How the estimate works
The IRS treats a prize as income at its fair market value, the same as a paycheck. So the calculator works out your 2026 federal income tax twice: once on your other income, and once on your other income plus the prize and any cash that comes with it. The difference is the tax the prize adds. Doing it this way matters, because a $100,000 prize stacked on a salary is taxed in your highest brackets, not at your average rate.
It uses the 2026 federal brackets and standard deduction the IRS published in Rev. Proc. 2025-32 (for example, a $16,100 standard deduction for a single filer and $32,200 for a married couple filing jointly). For your state it applies that state's 2026 brackets, from the Tax Foundation's table, updated for the states that cut rates during the year.
What it leaves out
Treat the result as a planning number. To keep it simple, the calculator does not include:
- Itemized deductions, tax credits, or credits that shrink as your income rises.
- State deductions, exemptions and credits. The state figure uses your federal taxable income as a stand-in, so it can be off a little in either direction.
- City and county income taxes, which some places add on top of the state tax.
- Withholding a sponsor might do, which changes when you pay, not how much you owe.
If the prize is large or your situation is unusual (self-employment, a move between states, big deductions), take the estimate to a tax professional rather than relying on it.
Reading the cash bonus and cash option
Many sponsors add cash to a vehicle prize, often described as money for taxes. That cash is income too, so the calculator adds it to the prize before working out the tax, then tells you whether it covers the bill. A cash option is different: it replaces the whole prize, so the comparison taxes the cash on its own and sets it against the vehicle's value plus any bonus, minus the tax on both.
The vehicle's side of that comparison uses the prize value unless you enter what it would actually sell for. You owe tax on the reported value either way, so if the car would sell for less, enter that number. For more on this, read take the car or the cash and taxes on winning a car.
When the sponsor reports it
For a free-entry sweepstakes, the sponsor reports prizes worth $2,000 or more on Form 1099-MISC (the threshold rose from $600 for payments made in 2026). Expect the sponsor to ask for your Social Security number on a Form W-9 before it hands over the prize. You owe the tax whether or not a form arrives.
