Getting two identical 1099-DA forms can look odd, but the fix is more straightforward than you might think: first compare the differences between the two forms, then contact the platform that issued them first to correct the mistake. Never try to "offset" one of them yourself or ignore the duplicate — the IRS will spot the mismatch and flag your return automatically.
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Step 1: Identify where the two forms came from — same platform or two different platforms
Start by checking whether the same platform sent you two copies of the same form, or whether two separate platforms both reported a single transaction of yours.
Case A: Same platform issued two identical forms (internal duplicate)
Open both PDFs and compare the "total proceeds" figure, the number of transactions and any wallet addresses. If everything matches, the platform's system simply sent the form twice.
2026 is the first year centralized crypto brokers must issue 1099-DA forms. Many platforms are still refining their processes, so duplicate mailings are not unusual.
Completion check: You can confirm that the "total proceeds" number is exactly the same on both forms.
Case B: Two different platforms reported the same transaction (cross‑platform duplicate)
For example, you moved coins from Platform A to Platform B, and both treated the transfer as a "disposal" and reported it. This is very common in the first filing year (2025) because each broker can only see its own records — the cost basis on the outgoing and incoming sides often doesn't match.
Completion check: You can name which platform issued each form and tell whether the coin type and amounts point to the same funds.
A common mistake: many people think, "I'll just report one copy on my tax return and ignore the other." But the IRS's system automatically checks the 1099 data it receives against the numbers you report before a human ever reviews your return. Any mismatch gets flagged. So you must go through the correction process; you can't pretend the duplicate doesn't exist.
Step 2: Contact the issuer to request a correction — not the IRS
The core rule for fixing a 1099 form is: whoever issued the form is responsible for correcting it.
What to do:
If both forms came from the same platform, contact that platform's tax support or customer service. Explain that you received two identical 1099‑DA forms and ask them to verify the records and void one of them.
If the forms came from two different platforms, first figure out which one reported the data correctly — this is usually the platform where the transaction actually happened (for example, if you sold on Platform A, that form is the right one). Then contact the platform that reported the error and ask them to correct or withdraw that report.
The correction method generally follows how the original form was filed: if the platform submitted it electronically, they need to file the corrected form electronically. If it was a paper filing, a paper correction form is required.
Important risk note: The most serious error on a 1099 form is a missing or incorrect Taxpayer Identification Number (TIN). If one of your duplicate forms has a wrong TIN or payee name, you must stress that this needs to be corrected — otherwise the IRS could treat you as two separate people.
Step 3: File your taxes using the correct numbers — while you wait for the correction
Until the platform completes the correction, your tax return should not include both duplicate amounts.
What to do:
Use the correct platform form as your reference (the one where the transaction actually occurred) and enter the corresponding total proceeds on Schedule D and Form 8949.
In your tax software (like TurboTax or Koinly), if you've already imported both duplicate records, manually mark the duplicate one as "to be corrected" or delete it.
If the filing deadline is approaching and the platform still hasn't issued the correction, you can file with the correct numbers. Make sure to save all communication records with the platform (emails, ticket numbers) so you have proof if the IRS later asks why you didn't report the second form.
The 2025 tax year is the first year brokers issue 1099‑DA forms. The IRS expects some data quality issues that first year, but the main risk remains "zero cost basis" reports where the cost basis field is missing. If your form shows a cost basis of $0 but you actually paid for the asset, you need to supply the correct cost basis on your return yourself and keep your purchase records as proof.
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How to verify the correction was done
After you've gone through the correction process, do these two things:
Log into the platform and check that only one valid 1099-DA record remains.
In your tax software, confirm that the total transaction amount you're reporting equals the number on the correct form — not the sum of both forms.
Next step to connect the dots: Save a screenshot of the ticket number or email thread from your chat with the platform's support team. Keep it in this year's tax folder. If the IRS later asks, "Why didn't you report the second form?" that record will be your backup. Aim to finish your taxes 2–3 weeks before the deadline so the platform has time to process the correction.
