Polymarket US Taxes: 1099-B, IRS Reporting & Tax Treatment

Last Updated on November 6, 2026 by Patrick Camuso, CPA

Form 1099-B, IRS reporting, account records and federal tax treatment for Polymarket US.

Quick Answer: How Are Polymarket US Taxes Reported?

Polymarket US activity can produce gains, losses and other amounts that require federal income tax analysis. The treatment depends on the particular contract, the taxpayer’s capacity and the transactions through which the position was acquired, changed and ultimately settled or closed. Depending on those facts, the analysis may involve IRC §165(d), general capital and ordinary income rules, §1234A, §1256 and, for qualifying taxpayers and instruments, §475.

The accounting begins with the underlying transaction history. Polymarket US provides records concerning executions, positions, settlements, fees, rebates and cash activity, and its current participant agreement expressly contemplates electronic delivery of tax forms, including Form 1099-B. Those records provide the factual foundation for tax reporting, while the federal characterization requires a separate analysis of the contracts and applicable authorities.

Polymarket US should also be distinguished from Polymarket.com. The U.S. product operates through a domestic exchange and clearing structure with its own account records. Polymarket.com uses a separate international, blockchain based environment in which wallet activity and on chain records may be central to the accounting. Taxpayers who used both products should establish each history separately before combining the results in their overall tax workpapers.

Polymarket US and Polymarket.com Use Different Records

Polymarket describes its U.S. and international offerings as separate products with accounts that are not connected. That distinction affects the records needed to reconstruct trading activity and support the resulting tax reporting.

Polymarket.com operates through an international blockchain based environment. Its activity can involve digital asset funding, collateral, outcome tokens and transactions recorded through Polygon. Depending on the taxpayer’s activity, reconstruction may require the platform history together with wallet and blockchain records establishing the assets transferred and positions actually traded. Our Polymarket.com Tax Guide addresses those issues in greater detail.

Polymarket US operates through QCX LLC, doing business as Polymarket US, which is a CFTC designated contract market. QC Clearing LLC, doing business as Polymarket Clearing, performs the applicable clearing functions. The customer facing application sits above that exchange and clearing infrastructure.

For tax and accounting purposes, those roles help identify where the relevant evidence should come from. The U.S. account can establish executions, position activity, settlements and cash movements associated with Polymarket US. International trading may require a different record set. A taxpayer who used both products should therefore maintain the two histories separately until each can be reconciled on its own.

USDC funding may require separate digital asset records

Polymarket US’s current funding documentation includes traditional payment methods and also permits USDC funding for certain eligible users.

Where USDC is used, the funding transaction should be documented according to what actually occurred. A transfer between accounts or wallets under continuing common ownership presents different tax considerations from an exchange or conversion of the digital asset. If the funding process includes a disposition or conversion, the taxpayer may need separate basis and gain or loss records for that transaction.

Those funding records should remain distinguishable from the subsequent event contract activity. The use of USDC to fund a U.S. account does not change the source records needed to establish the contracts traded through Polymarket US.

How Polymarket US Trading Works

Polymarket US uses a different market structure from the separate Yes and No outcome token model associated with Polymarket.com.

Under its current market structure documentation, an ordinary binary market contains one instrument representing a specified outcome. A purchase creates affirmative exposure to that outcome, while a short side transaction creates the opposing exposure under the exchange’s trading and collateral arrangements.

That structure matters when reconstructing the account. A sell execution can have different effects depending on the position that existed immediately before the trade. It may establish short exposure, reduce an existing long position or form part of the activity used to close a position. The execution history therefore needs to be read together with the position records rather than treated as a series of isolated buy and sell labels.

The distinction becomes increasingly important for active traders. A single market can contain repeated purchases, reductions, offsets and newly established exposure over time. The annual economic result may ultimately be summarized, but the underlying transactions still need to support the positions and tax treatment reported.

Preserve how each position ended

Polymarket US permits participants to reduce or close positions before the underlying event resolves. Other positions remain open through resolution and contractual settlement.

The accounting should preserve those facts. For a position changed before resolution, the records should identify the opening activity, subsequent executions and quantities affected. For a position held through resolution, the file should retain the applicable contract terms, resolution information and actual settlement amount.

Ordinary binary contracts generally settle at $1 or zero depending on the outcome, while Polymarket US’s settlement documentation also provides for other settlement mechanics in specified circumstances. Those terms should be captured from the actual contract rather than reconstructed from a general assumption about binary markets.

The same approach applies to busted or corrected trades. If an execution is subsequently reversed under exchange procedures, both the original activity and the correction should remain identifiable so that the trade history, positions and cash movements can be reconciled.

Fees and Rebates Should Remain Separately Identifiable

Polymarket US has changed its fee and rebate arrangements during 2026. For historical accounting, the strongest evidence is therefore the amount actually charged or credited in connection with the relevant activity.

The current fee documentation describes transaction fees, maker rebates, taker fee rebates and separate mechanics for certain contract categories. Because schedules and incentive arrangements can change, historical activity should be reconstructed using the terms and account data applicable to the actual trade date.

Fees and rebates should remain separately identifiable in the accounting records. Their federal tax treatment depends on the transaction or arrangement that produced the amount, including whether a particular payment relates to acquiring or disposing of a position, providing liquidity or another activity.

Our Prediction Market Maker Rebates and Incentives Tax Guide addresses those issues in greater detail.

What Records Does Polymarket US Provide?

Polymarket US’s reporting documentation describes historical trade and order searches together with downloadable records covering trades, executions, positions and fees. Separate position and cash balance ledgers provide additional information concerning changes in positions and account balances.

These records serve different purposes. An order may be filled in full, partially filled, canceled or rejected, while the executed quantity determines the position actually established or changed. Polymarket US also distinguishes executions from matched trades and retains information concerning trades that are later busted.

For tax reconstruction, those details can be more useful than an annual performance number because they establish how the account moved from one position and balance to the next.

Some ledger history begins May 1, 2026

Polymarket US currently states that its downloadable position ledger and cash balance ledger endpoints have a historical floor of May 1, 2026. Earlier activity may still be available through other reports, confirmations or account records, but those particular downloads do not provide a complete before May history.

That limitation matters where an opening position or cash balance originated before the available ledger period. A position appearing in May may require earlier records to establish how it was created, what was paid and what subsequent activity affected it.

Professional traders and trading firms should account for that limitation when reconciling a complete taxable year.

Platform cost basis and realized P&L are source records

Polymarket US’s portfolio activity API includes fields labeled costBasis and realizedPnl.

Those fields can be useful in reconciling how the platform calculates the economics of a position. Federal tax basis and character still depend on the underlying transaction and applicable tax rules, so the platform calculation should be retained together with the executions, position history and settlement records that support it.

For a trading business, platform accounting may also sit alongside a separate transaction subledger, general ledger and tax basis workpapers. Our Prediction Market Accounting Guide addresses how those records fit together.

Does Polymarket US Issue Form 1099-B?

Polymarket US’s current Individual Participant and Clearing Member Agreement expressly contemplates federal tax information reporting and includes consent to electronic delivery of tax forms, including IRS Form 1099-B.

That language establishes that Form 1099-B is part of the contemplated reporting framework. The actual reporting for a particular taxpayer will depend on the account structure, transactions and documents furnished for the relevant year.

A taxpayer who receives Form 1099-B should reconcile it to the complete account activity. IRC §6045 and the IRS Instructions for Form 1099-B govern the applicable information reporting framework, while the substantive federal tax treatment continues to depend on the underlying contracts and transactions.

That distinction can matter where the information return and the taxpayer’s supported federal treatment do not align perfectly. The filing work should identify the transactions covered by the form, the amounts reported, any basis information provided and the reason for any supported adjustment in the tax computation.

The same recordkeeping remains important when no information return is furnished. Tax reporting is based on the underlying activity, and the account history remains the primary record of what occurred.

Our Prediction Market Tax Reporting resource discusses the broader reconciliation process.

How Is Polymarket US Activity Taxed?

The federal income tax analysis should be performed on a contract by contract basis, with attention to the rights created by the instrument, taxpayer capacity and the transactions through which the position was acquired and concluded.

Potentially relevant provisions include §165(d), general capital and ordinary income principles, §1234A, §1256 and, for qualifying taxpayers and instruments, §475. Which framework applies depends on the facts and applicable authorities rather than the venue name or a broad category assigned to the market.

Wagering characterization

Section 165(d) may require consideration for particular event contracts. The analysis depends on the specific contractual arrangement and transaction, including the nature of the rights and obligations and the circumstances in which the position is held and resolved.

The subject referenced by the contract can be relevant, along with the structure of the instrument, exchange and clearing arrangements, transferability and manner of settlement. Those facts should be evaluated together under the applicable federal tax authorities.

Where §165(d) applies, the loss limitation can materially affect the federal result. For taxable years beginning after December 31, 2025, deductible wagering losses are generally limited to 90% of qualifying losses and may not exceed gains from wagering transactions. Certain otherwise allowable deductions incurred in carrying on wagering transactions are included within that framework as well.

The characterization should therefore be resolved before those limitation rules are applied.

Capital and ordinary characterization

Where §165(d) does not govern the transaction, the analysis may proceed under the general rules applicable to contractual property and the taxpayer’s activities.

An acquired contractual right may require analysis under §1221 and related authorities. The result can depend on taxpayer capacity and on what happened to the position. A transfer of an existing contractual right before resolution presents different legal questions from a contract that remains outstanding through settlement or another form of termination.

Section 1234A may also require consideration for particular terminations where its statutory requirements are satisfied. The relevant inquiry is the legal effect of the transaction rather than the terminology used on the trading screen.

Our Prediction Market Tax Guide addresses the broader federal characterization framework.

Professional traders and Section 475

Professional activity adds another layer of analysis. Section 475 imposes mark to market rules on dealers in securities and provides elective mark to market regimes for qualifying dealers in commodities and qualifying traders in securities or commodities.

Application of those rules requires analysis of the taxpayer and the instruments involved, together with any applicable election requirements. Trading volume, market making activity and other business facts are relevant to that inquiry but should be evaluated within the statutory framework.

Section 1256

QCX’s status as a CFTC designated contract market is relevant to §1256 because a domestic designated contract market can satisfy the qualified board or exchange component of an otherwise applicable statutory category.

The contract must also satisfy the remaining requirements of an affirmative §1256 category. For example, the regulated futures contract definition includes additional requirements concerning the applicable margin or mark to market system, and §1256 contains exclusions for specified swaps and similar agreements.

The analysis therefore turns on the particular instrument and applicable statutory category. Our Section 1256 and Prediction Markets Guide examines those requirements in greater detail.

Where a material return position depends on an unresolved characterization issue, a documented contract specific analysis may be appropriate. Our Prediction Market Tax Opinion Guide discusses when additional written support may be warranted.

Recordkeeping for Active Traders and Trading Firms

A supportable Polymarket US tax file should preserve the information needed to reconstruct the taxpayer’s positions and financial results.

For each material population of activity, that generally means retaining the contracts traded, execution history, position changes, settlement records, fees and rebates, cash movements, corrections and positions remaining open at year end. Original exchange files should be retained where available rather than relying only on a transformed spreadsheet or annual P&L summary.

Deposits and withdrawals should also remain separately identifiable. They help reconcile the account but may represent contributed funds, proceeds from earlier transactions, settlement receipts or other account movements. The underlying trading and settlement records provide the basis for determining the federal tax consequences.

Where the taxpayer also used Polymarket.com, the U.S. and international transaction populations should be reconstructed separately. USDC funding of a U.S. account may require its own digital asset records, while the event contract activity remains supported by the Polymarket US account.

For professional traders and entities, the same records may also support a transaction subledger, general ledger, owner or investor reporting and federal tax workpapers. Our Professional Prediction Market Trader Tax Guide discusses those considerations in greater detail.

How Camuso CPA Helps With Polymarket US Tax and Accounting

Camuso CPA works with professional prediction market traders, market makers and trading businesses on transaction accounting, reconciliation, federal tax characterization and reporting.

Where historical activity is incomplete or positions do not reconcile, the work may begin with Prediction Market Accounting and transaction reconstruction. Where the records are complete but the federal treatment requires additional analysis, the work may involve Prediction Market Tax Reporting, contract specific tax research or written support for a material filing position.

Learn more about our broader Prediction Market CPA services.

Final Thoughts

Polymarket US introduces a U.S. exchange, clearing and reporting structure that is materially different from the international Polymarket.com platform. That difference affects the records taxpayers should preserve and the way trading activity is reconstructed for tax purposes.

The strongest tax file begins with the actual contracts and transaction history. Executions, position changes, settlement terms, settlement amounts, fees, rebates, corrections and cash activity should be preserved in sufficient detail to explain how each material position and financial result arose.

Federal characterization follows from that factual record. Information returns, exchange status and platform calculations can all contribute useful evidence, but the ultimate analysis depends on the particular contracts, transactions, taxpayer circumstances and applicable tax authorities.

Frequently Asked Questions About Polymarket US Taxes

Is Polymarket US the same as Polymarket.com for tax reporting?

No. Polymarket US and Polymarket.com use different account and transaction infrastructures. Their respective trading histories should generally be established separately before the results are coordinated on the taxpayer’s return.

Does Polymarket US issue Form 1099-B?

Its current participant agreement expressly contemplates electronic delivery of tax forms, including Form 1099-B. The actual forms furnished can depend on the taxpayer’s account and activity during the relevant year.

Does Polymarket US report trading activity to the IRS?

Its participant documentation contemplates federal information reporting. Taxpayers should review the forms actually issued for their accounts and reconcile them to the underlying transaction history.

Do I need Polygon wallet records for Polymarket US?

Ordinary Polymarket US trading is supported by the U.S. account and exchange records. Separate wallet records may be relevant where digital assets such as USDC were used in funding or where the taxpayer also traded through Polymarket.com.

How are Polymarket US contracts taxed?

The analysis is contract specific. Relevant provisions may include §165(d), general capital and ordinary income rules, §1234A, §1256 and, for qualifying taxpayers and instruments, §475.

Is Polymarket US subject to Section 1256?

QCX’s designated contract market status is relevant to the §1256 analysis, but the particular contract must satisfy the requirements of an applicable statutory category.

Can I use Polymarket US realized P&L on my tax return?

Platform P&L can be useful reconciliation evidence. The tax computation should still be supported by the underlying transactions and the federal tax treatment applied to them.

Are Polymarket US withdrawals taxable?

A withdrawal is an account movement. The tax treatment generally depends on the trading, settlement or other transactions that produced the funds being withdrawn.

What if I traded on both Polymarket US and Polymarket.com?

Reconstruct each product separately and then coordinate the resulting amounts in the overall tax computation.