US crypto tax paperwork, 2026 season
Form 1099-DA says no cost basis? Start here.
A free checker that runs entirely in your browser: enter your sales, spot rows with missing basis, see gain or loss and the Form 8949 box that likely applies, and export a CSV for your preparer.
Open the checker → Read the guides
Nothing is uploaded. No account. Not tax advice.
What you can do here
Flag missing basis
Empty basis is never silently treated as zero.
Short vs long term
From your acquisition and sale dates, with caveats.
Troubleshooting checklist
Eight steps when your 1099-DA is blank or wrong.
Popular guides
1099-DA Cost Basis Missing: What It Means and What to Do
Why basis may be blank and how to rebuild it.
1099-DA vs Form 8949: How They Fit Together
How the two forms fit together and which box applies.
1099-DA Shows the Wrong Cost Basis: What to Do
Check lots and dates, ask the filer for a correction.
1099-DA After Moving Crypto Between Exchanges: Basis
Transfers in, boxes 12a/12b, lot order.
No 1099-DA? You Still Have to Report Crypto
Yes: report even without a form.
1099-DA Box-by-Box Guide (Including Box 1f)
Box 1f is proceeds; box 1g is cost basis.
1099-DA and Stablecoins: What Gets Reported
What brokers report and what you still owe.
Crypto Wash Sale Rule in 2026: What Applies, What Doesn't
What applies and what is only proposed.