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Check your crypto tax form against your own records
Your exchange sends the IRS a Form 1099-DA listing your crypto sales. This free tool lines it up with your records and shows, in plain English, where the numbers don't match — before you file.
- 🔒 Runs in your browser — nothing is uploaded
- 📄 Reads PDF or CSV
- 🏛️ Explanations cite IRS sources
How it works
- 1
Add your 1099-DA
The PDF or CSV your exchange (e.g. Coinbase, Kraken) gave you.
- 2
Add your records
A CSV of your own sales, or a Form 8949 export from tax software.
- 3
Review results
See each sale matched, with what each difference means and what to do next.
1099-DA checker
🔒 Everything runs in your browser. No file is uploaded, and nothing leaves your device. PDFs are read with a copy of pdf.js stored on this site (no CDN).
Upload your 1099-DA (PDF or CSV)
Check the rows we read from your form
Compare these with your form. PDF extraction can miss rows or put numbers in the wrong column. Click any cell to edit, delete wrong rows, or add missing ones.
Add your own records (CSV)
What should my CSV look like?
One row per sale with these column headers (any capitalization): asset, date_sold, units, proceeds, basis. Basis may be blank. Optional: date_acquired, term, noncovered. Rows are matched on asset + sale date + units. Most crypto tax tools can export a Form 8949 CSV you can adapt.
asset,date_sold,units,proceeds,basis BTC,2026-03-02,0.1,6000,5000
Review results
What the results mean
Your form and your records agree (within the tolerance you set). Next: nothing to fix for this row.
The form shows no cost basis. That's normal for many sales (see covered vs noncovered); it does not mean your basis is $0. Next: use the basis from your own records on Form 8949.
The sale amount differs. The number shown is form minus your records. Fees and timing are common causes. Next: check the trade in your exchange history; if the form is wrong, ask the broker about a corrected form.
Cost basis differs (form minus your records). Per the IRS, any amount in box 1g, even 0, was reported as basis (Form 1099-DA). Next: confirm your purchase records; see the Form 8949 instructions for reporting an adjustment.
A sale is on the form but not in your records. Next: find it in your exchange history and add it — the IRS got a copy of this form.
You have a sale the form doesn't list — e.g. a different exchange, a self-custody wallet, or a date that shifted (see the Kraken note below). Next: you still report it; check the date and which account it came from.
(Asset totals only) The total quantity sold differs. Next: look for a missing or split sale.
Why basis may be blank: for 2025 sales brokers weren't required to report basis (2025 Instructions for Form 1099-DA). For sales after 2025, basis is required only for covered securities (2026 Instructions).
New to all this?
Read our plain-English guide to taxable events, cost basis, and what the 1099-DA means for you.
Start here