Reconcile your Form 1099-DA gross proceeds with your actual cost basis. Calculate real crypto gain or loss for tax year 2025 (first mandatory reporting year).
Understanding Form 1099-DA for Tax Year 2025
Form 1099-DA is the first mandatory crypto exchange reporting form in US tax history. Exchanges like Coinbase, Kraken, and Gemini are required to send this form to both you and the IRS for any cryptocurrency sales made in 2025. This is a major change β the IRS can now match your reported income against exchange records.
Important: The 1099-DA only reports gross proceeds in 2025. You must supply your cost basis to determine actual taxable gain. If you cannot document your basis, the IRS may treat the entire gross proceeds as taxable income.
The Reconciliation Formula
Actual Gain = Gross Proceeds (from 1099-DA) - Your Cost Basis - Exchange Fees
If Actual Gain > 0: Tax = Gain Γ (STCG or LTCG rate)
If Actual Gain < 0: Capital loss (up to $3,000 deductible against ordinary income)
Difference = Reported Proceeds - (Your Basis + Fees + Actual Gain)
Example
1099-DA shows $50,000 gross proceeds. Actual basis: $35,000. Fees: $500. Long-term. Single, $75K other income.
Actual gain: $50,000 - $35,000 - $500 = $14,500
LTCG rate (at $89,500 total income): 15%
Tax owed: $14,500 Γ 15% = $2,175
Without documenting basis: $50,000 Γ 22% = $11,000 (5Γ more!)
Frequently Asked Questions
What is Form 1099-DA and when did it start?
Form 1099-DA is a new IRS reporting form that crypto exchanges must issue starting with the 2025 tax year (forms mailed in early 2026). It reports gross proceeds from cryptocurrency sales β similar to how brokerages report stock sales on Form 1099-B. For 2025, exchanges only report gross proceeds; cost basis reporting begins in 2026.
Why does Form 1099-DA only show gross proceeds and not my gain or loss?
In 2025 (the first year), exchanges were only required to report gross proceeds β the total amount you received when you sold crypto. They did not track your original cost basis. This means the IRS will see your total sales amount but YOU must provide your cost basis on Form 8949 to determine the actual gain or loss. Starting 2026, exchanges must also report cost basis for newly acquired coins.
What happens if I cannot find my original cost basis?
If you cannot document your cost basis, the IRS may assume it is $0 β meaning the entire gross proceeds become taxable gain. You can use the basis reconstruction tool in the Extended section to estimate your basis from total invested vs. total withdrawn. Alternative methods: check exchange transaction histories, bank records, screenshots, or blockchain explorers. Always keep records.
What if the amount on my 1099-DA is wrong?
Errors on Form 1099-DA can occur if an exchange received assets from another wallet and does not know your original basis, or if transactions were incorrectly categorized. If you believe the form is wrong, you should still report your actual gain or loss on Form 8949, attach a statement explaining the discrepancy, and contact the exchange to request a corrected form. Do not simply ignore the discrepancy.
Do I need to file Form 8949 if I have a 1099-DA?
Yes. Form 1099-DA from your exchange goes to the IRS, but you must still reconcile it on Form 8949 (Sales and Other Dispositions of Capital Assets). You report each transaction with your cost basis, the resulting gain or loss, and whether it is short-term or long-term. The totals flow to Schedule D and then to your Form 1040.