Gambling session method: per wager or session
The same year of betting produces wildly different reportable income depending on how you group it. The difference is not small and it is not settled.
Sources last checked 2026-10-11.
The two ways to count
Under the gross method every wager is its own transaction. Each winning bet adds its profit to your income. Each losing bet is a separate loss you deduct only if you itemize. From tax year 2026 you may deduct only 90 percent of your losses, and never more than your winnings. Under session accounting you net the wins and losses inside a session. A winning session adds its net to your income. A losing session is a loss, under the same itemizing rule and the same cap. You do not net one session against another to report a single figure for the year.
For a bettor placing hundreds of wagers a year the gap can be large. The same activity can produce six figures of gross winnings under one method and a much smaller figure under the other, from identical bets.
Why this matters even if you broke even
An example
One year, 300 bets of $100. You win 150 of them at standard odds and lose 150. You have finished about $1,360 down.
| Gross method, reportable winnings | about $13,640 |
| Gross method, deductible losses | about $13,500, if you itemize |
| Session method, reportable | the net of each winning session |
| Session method, deductible losses | the net of each losing session, same rules |
Under the gross method you add about $13,640 to your adjusted gross income for a year you lost money on. If you itemize, you may deduct 90 percent of your $15,000 of losses, which is $13,500. That is less than your winnings, so about $136 stays taxable. If you take the standard deduction, none of the losses come back.
What is actually settled
Session accounting is well established for slot machine play, where the Tax Court has applied it and the IRS has proposed a safe harbor. It is not settled for online sports wagering. No IRS ruling defines a session for a bettor placing wagers on a phone across a day, and the analogy to a slot session is exactly that, an analogy.
Our calculator will show you both figures side by side if you give it your session numbers. It does not tell you which to file, because nobody can.
What we could not confirm
We could not get the IRS Chief Counsel advice memorandum on slot machine session accounting from irs.gov, so we do not cite it. IRS Notice 2015-21 is on irs.gov, and it is a proposed revenue procedure, not a final one. It says gross income from slot machine play “is determined on a session basis”, citing two Tax Court cases. It does not permit sessions to be netted against each other for the year. It covers slot machine play only. If you are deciding a real filing on this point, ask a professional.
The practical problem
Session accounting requires going through every bet of the year and grouping them, then netting each group. You have to rebuild that from your own bet history.
That reconstruction is the problem we are building a paid tool to solve. We are saying so plainly rather than pretending the free calculator does it.
Sources
Every source below is a statute, an IRS document or official form instructions.