A staked score is one win with more than one owner. The cage pays one person, the IRS gets a form with one name on it, and the money is split later. The gap between who got paid and who earned the money is where staking tax problems start.
Who owns what
The backer puts up some or all of the buy-in, the player (the horse) plays, and the agreement decides the split. The backer’s share is what the backer bought or funded. The player’s share is what the player keeps: any piece they paid for, plus their profit split.
Hypothetical example. A backer funds a $10,000 buy-in for 50% of the profit. The player cashes for $90,000, a profit of $80,000. The backer receives the $10,000 back plus $40,000, or $50,000. The player keeps $40,000.
The goal is for each return to reflect that person’s share, not the whole prize.
How the casino reports it
Payers report poker tournament winnings on Form W-2G when they meet the applicable reporting threshold, measured per tournament after subtracting the buy-in (IRS Instructions for Forms W-2G and 5754, Rev. January 2026). Several gambling thresholds changed for 2026, so check the current figure in Pub. 1099.
Poker tournament wins reported on a W-2G are not subject to regular gambling withholding, but a winner who gives no taxpayer identification number faces 24% backup withholding (same source).
The catch: by default, the W-2G goes to the person at the cage, so the IRS may see the whole prize under the player’s name.
Form 5754: splitting the paperwork
Form 5754, Statement by Person(s) Receiving Gambling Winnings, is built for this. The person receiving the winnings completes it when they are not the actual winner or when two or more people share the winnings. Part II lists each person the winnings are taxable to and the amount each won. The form goes back to the payer, not the IRS, and the payer prepares a separate W-2G for each listed winner (IRS Instructions for Forms W-2G and 5754; Form 5754, Rev. November 2024; IRS Publication 505 (2026)).
- Timing. The instructions set no separate deadline, but the payer needs the form to prepare W-2Gs, which may be issued at payout or by January 31 of the next year. Handle it at the cage, before the money moves.
- Signature. If tax is withheld, the recipient signs under penalties of perjury.
- Practice varies. Ask the cage how they process Form 5754 before you need it, and agree in advance how backers’ details will be provided.
When the W-2G shows the whole prize
Sometimes the W-2G lands in the player’s name for the full amount anyway. The player’s return still has to account for it, and the agreement and settlement trail support the backer’s share. How to present it depends on the facts, so work it through with your preparer rather than leaving the form off.
The backer may have winnings no form reports. Those are still reportable, since all gambling winnings are (IRS Topic No. 419).
How each side reports its share
- The player reports the player’s share, and where it lands depends on professional or recreational status. A buy-in the backer paid for is generally not the player’s loss.
- The backer reports the backer’s share of winnings and the buy-ins the backer funded. A backer who stakes as a business may qualify as a professional under the same test.
- Both sides face the wagering loss limit: losses count only against same-year wagering gains, and starting with 2026, only 90% of losses are deductible (IRC §165(d)). See the 2026 gambling loss limit.
Makeup and markup in plain terms
Makeup is what a player must win back for the backer before profit is split in an ongoing deal.
Hypothetical example. Over three months, a backer funds $30,000 of buy-ins, including the one that finally pays. The player cashes for $50,000. The first $30,000 clears makeup and goes to the backer, and the remaining $20,000 is split 50/50. The backer receives $40,000; the player receives $10,000.
- The player’s share is $10,000, not $50,000. Cashing big and making money are not the same thing.
- The tax year is its own clock. Makeup can roll into a new year; deductible losses cannot (IRC §165(d)). A backer can end up with losses in one year and winnings in the next.
- Is makeup a debt? That is a contract term. If the player must repay it in cash, the deal looks more like a loan, and the analysis can change.
Markup is the premium a player charges when selling action. At 1.2, a backer pays $1.20 for each $1 of buy-in.
Hypothetical example. A player sells 50% of a $10,000 buy-in at 1.2. Backers pay $6,000 for $5,000 of face value, and the player’s cost for the other half drops to $4,000.
- For backers, the natural reading is that the price paid, premium included, is their cost of the action.
- For the player, the $1,000 premium is the hard part. It can be viewed as lowering the player’s cost or as separate income, and we know of no IRS guidance that settles which. Pick a reasonable treatment with your preparer and apply it consistently.
Swaps between players
A swap is two players trading a percentage of each other’s results, often 5% for 5%: staking in miniature. If one player cashes, the swap payment is the partner’s share, not the casher’s. Form 5754 covers winnings shared by two or more people, so a swap partner may belong on it at payout. Swaps are rarely written down; a dated message naming the event and percentages, settled by a traceable payment, beats memory.
Partnership or something else?
Most staking deals are handled as each person owning a share of a wager. But a partnership, for tax purposes, includes a syndicate, group, pool, joint venture, or other unincorporated organization carrying on a business, financial operation, or venture (IRC §761(a)). A contractual arrangement can create a separate entity when the participants carry on a trade, business, financial operation, or venture and divide the profits (Treas. Reg. §301.7701-1(a)(2)).
Courts ask whether the parties, in good faith and with a business purpose, intended to join together in conducting the enterprise (Commissioner v. Culbertson, 337 U.S. 733 (1949)). The Tax Court has weighed the agreement and how it was carried out, contributions, control over income and capital, loss sharing, and separate books (Luna v. Commissioner, 42 T.C. 1067 (1964)).
A piece of one event differs from a year-long deal with a shared bankroll and joint decisions. Other readings are possible, such as the player’s split looking more like a fee for playing. A partnership generally must file its own return (IRC §6031). This is a facts-and-circumstances question, and a large or long-running deal deserves professional review.
Why a written agreement matters
The agreement is your evidence. Put in writing:
- Scope: the parties and the events or period covered
- The split: percentages, markup, and who pays buy-ins and travel
- Makeup: how it builds and what happens if the deal ends
- Settlement and paperwork: how money changes hands and who handles Form 5754
- Swaps: whether allowed, and whose share they come from
Records each side should keep
IRS guidance calls for an accurate diary of wins and losses, backed by documents such as Forms W-2G and 5754 (Rev. Proc. 77-29; IRS Publication 529).
- Players: per event, the buy-in and who funded it, action sold and markup, the result, payouts to backers and swap partners, and every W-2G and Form 5754.
- Backers: per stake, the amount funded, percentage and price, settlements received, and the makeup balance.
- Both: the signed agreement, a settlement ledger, and a payment trail that ties to bank statements.
See the poker player’s recordkeeping system for a setup.
How TreeStar can help
The TreeStar team can help players and backers sort out who reports what: tax preparation and planning for each side’s share, recordkeeping and bookkeeping that tie settlements to every W-2G, cash flow planning so tax money is set aside after a score, a review of partnership questions in a long-running deal, and IRS representation if a notice arrives.
This article is general information, not advice for your situation. Rules change; confirm current law before acting.
