QastLedger
To report Polymarket trades on your taxes, you need a complete record of every position you opened and closed during the year. Polymarket's international platform generally won't send you a tax form, so you have to build that record yourself.
The good news is that Polymarket trades are recorded on the Polygon blockchain. Your full history is public and permanent, and all you need to retrieve it is the right wallet address.
Use your Polymarket wallet address
This is where most people get stuck. When you use Polymarket, your funds and positions sit in a wallet that Polymarket sets up for your account. Its address is often different from the address of the wallet you log in with, such as MetaMask or an email login.
To find the right one:
- Log in to Polymarket and open your profile.
- Look for your wallet or deposit address. It's a long string starting with
0x. - Copy the full address.
If you look up your login wallet's address instead and see no trades, you're probably using the wrong address.
Your wallet address is safe to share
A wallet address is like an account number that anyone can look at but nobody can spend from. Sharing it lets a tool read your history. It can't move your funds or place trades.
What you should never share is your private key or seed phrase (the 12 or 24 recovery words). No legitimate tax tool needs them. If one asks, don't use it.
What a complete history includes
- Every buy and sell, with the date, price and quantity.
- Resolutions, when a market settled and paid out, or expired worthless.
- Positions still open at the end of the year, since they aren't taxed until they close under holding-period treatment.
Buys and sells then have to be matched into positions so you can see the gain or loss on each one. Doing that by hand from raw blockchain data is slow and error-prone.
Traded from more than one account? Read how to combine multiple Polymarket wallets. Next, see how to report Polymarket trades on your taxes.
This guide is general information, not tax advice. Tax treatment of event contracts is still evolving, so confirm how it applies to you with a tax professional.