1099-DA Calculator
Crypto Tax Hub • Missing Cost Basis Check • 2026 Filing Help
1099-DA Wrong? Fix Crypto Taxes That Look Too High Before Filing
If your 1099-DA shows gains that look too high, missing cost basis may be the reason. This happens when exchanges report sale proceeds without full acquisition history, especially after wallet transfers, self-custody activity, or multi-platform trading.
This hub helps you quickly check whether your crypto tax records may need reconciliation before filing. Use the calculator below, then follow the path that matches your situation.
Built for crypto tax mismatch screening • Educational use only • Not tax or legal advice
Check My 1099-DA Mismatch Risk
Where the mismatch usually starts
Your 1099-DA may look wrong when the platform reporting the sale does not have the full history behind the asset.
a) you bought on one exchange and sold on anotherb) you moved crypto through a private wallet before the final salec) the original purchase happened outside the reporting platformd) transfers broke the visible cost basis traile) multiple platforms each reported only part of the story
What kind of 1099-DA mismatch are you dealing with?
Choose the situation that feels closest to your records before filing.1) Exchange-to-wallet transfer issue
You bought crypto on an exchange, moved assets to a wallet, then sold later.2) Wallet-to-exchange reporting issue
You used MetaMask or another wallet before sending assets back to an exchange to sell.3) Cross-exchange basis gap
You bought on one platform and sold on another.4) Multi-platform transaction history issue
Your gains may be based on partial records from several exchanges and wallets.5) My gains look much higher than expected
Your reported proceeds may be correct, but the cost basis trail may be incomplete.6) My exchange report is missing cost basis
The sale may be reported without enough acquisition history attached.
Use the calculator below, then choose the page that matches your issue.
Crypto 1099-DA Mismatch Risk Calculator
Estimated 1099-DA Mismatch RiskScore: 0 / 100
Risk Level: Not Calculated
Estimated Missing Cost Basis Exposure$0
What Your Result Means
-Low Risk-
Your 1099-DA may include enough visible cost basis data for an initial review, but you should still compare it against your own records before filing.-Medium Risk-
Some transfers, purchases, or transaction history may be missing from the records used to calculate your reported gains. Manual review is recommended.-High Risk-
Your reported gains may rely on incomplete cost basis information. If you file without reconciliation, your taxes could be overstated.Estimated Missing Cost Basis ExposureThis estimate is directional only. Final results depend on your full transaction history, wallet activity, exchange data, and original acquisition records.
Common 1099-DA Filing Problems
a) Missing cost basisb) Gains look too highc) Wallet transfer history not reflectedd) Exchange records do not match the original purchase historye) You cannot file confidently because the numbers look wrong
That usually means the platform reporting the sale does not have your full transaction history.
What to do before filing if your numbers look wrong
If your numbers look wrong, do not rush to file based only on what one platform reported.
StepsStep 1 — Download your exchange records
Export the transactions tied to the reported sale.Step 2 — Compare against original acquisition history
Check where the asset was first bought, transferred, swapped, or bridged.Step 3 — Identify missing basis events
Flag any sales where proceeds appear without the full purchase history attached.Step 4 — Rebuild the basis trail
Match transfers, wallet activity, and original buys before relying on the reported gain.Step 5 — Choose the safest next step
Use the checklist, the rescue guide, or reconciliation software depending on complexity.
- before filing
- before importing into tax software
- before trusting the reported gain
- before sending records to a preparer
That is when cost basis gaps are easiest to catch and fix.
Find the page that matches your crypto reporting issue
Used a private wallet before selling on an exchange.
Bought, transferred, or sold through Coinbase and the numbers look off.
Robinhood shows gains, proceeds, or basis that do not match your records.
Cross-platform Binance activity may have broken the visible basis trail.
Kraken reporting may be missing part of your acquisition history.
Document the mismatch clearly before filing or follow-up.