By Mike Ring | Blockchain Crypto Tax Prep
Your 1099-DA arrived. The number in the proceeds box looks like a fever dream. Maybe it’s double what you actually received. Maybe the cost basis box is blank — or shows zero. Maybe there’s a transaction on there you don’t recognize at all.
Welcome to the first year of mandatory digital asset broker reporting. It’s going to be a little bumpy.
The good news: a wrong 1099-DA doesn’t mean a wrong tax return — if you handle it correctly. The bad news: ignoring the discrepancy and filing anyway is exactly how you end up with a CP2000 notice and a bad afternoon. This guide walks through how to identify errors, how to get them corrected (when that’s even possible), and how to report accurately on your return regardless.
What 1099-DA Actually Is (and What It Isn’t)
Form 1099-DA is a new IRS information return used to report proceeds from certain digital asset transactions, including sales, exchanges, or other dispositions of cryptocurrency and non-fungible tokens (NFTs). Like other forms in the 1099 series, it gives the IRS third-party reporting that can be matched against your return.
The new Form 1099-DA is used by brokers to report certain transactions involving digital assets that took place beginning in calendar year 2025. Brokers were required to provide statements to taxpayers by February 17.
Here’s the structural issue that makes almost every 2025-year 1099-DA look wrong at first glance: it reports gross proceeds, not gains. Exchanges are not required to report cost basis for 2025, which means your form may show incomplete information that overstates your actual tax liability. That’s by design — not a mistake — but it produces numbers that look alarming.
Receiving Form 1099-DA does not automatically mean additional tax is owed. Your 1099-DA showing $180k in proceeds and your bank account showing $12k are both technically correct. That’s the magic of gross proceeds reporting with no cost basis attached.
But some errors on 1099-DA are actual errors — wrong proceeds amounts, phantom transactions, duplicate entries. Those need to be handled differently.
How to Tell If Your 1099-DA Is Wrong
Not every unfamiliar number is an error. Before you call your exchange’s support line in a panic, run through this checklist.
The Cost Basis Is Blank or Zero
This is not an error — for 2025. For the 2025 tax year, brokers are only required to report gross proceeds from sales on Form 1099-DA. Mandatory basis reporting will be phased in, applying only to “covered securities” — digital assets acquired on or after January 1, 2026 and held continuously in a broker’s account. Any asset acquired before that date or transferred into a broker’s platform is considered a “noncovered security,” for which brokers are not required to report basis.
A blank or $0 basis does not mean you paid nothing; it means the broker did not provide that information. You still owe the correct amount of tax — which requires you to reconstruct your actual cost basis from your own records. More on that below.
The Proceeds Amount Looks Wrong
This can be an actual error. Pull your exchange transaction history and compare it line by line to the proceeds figures on your 1099-DA. Small discrepancies (a few dollars) may reflect differences in fee treatment or rounding. Large discrepancies — especially proceeds for assets you don’t own or transactions you didn’t make — are genuine errors that need to be corrected.
Common causes of actual proceeds errors:
- Duplicate reporting: a transaction counted twice
- Transfer misclassified as a sale: moving BTC from Coinbase to a hardware wallet is not a taxable event, but some brokers have flagged these incorrectly
- Wrong account: another customer’s transaction appearing on your form (rare but documented in year one)
- Wash sale or return-of-capital treatment applied incorrectly
There’s a Transaction You Don’t Recognize
Verify the date and asset against your own records. If you genuinely cannot reconcile it to any real activity, that’s an error worth escalating to the broker. Do not simply ignore unrecognized transactions — if the broker reported it to the IRS, the IRS expects to see it on your return, or a documented explanation of why it shouldn’t be there.
The Form Shows a Sale You Made — But on the Wrong Exchange
For 2025, the Form 1099-DA filing requirements generally apply to U.S. brokers. This means that taxpayers transacting with foreign brokers, such as exchanges based outside the United States, may not receive a Form 1099-DA from that foreign broker. If you see a transaction attributed to the wrong U.S. broker, that’s an error worth documenting.
Step 1: Document Everything
Before you contact anyone, build your paper trail. This protects you regardless of how the correction process goes.
- Download your complete transaction history from every exchange involved
- Export wallet transaction logs (on-chain data is immutable; use it)
- Screenshot your 1099-DA as received — both the form and any accompanying brokerage statement
- Note every specific discrepancy: the field, the reported amount, and what your records show
Keep all of this. Keep a copy of the original form and all correspondence with the issuer for your records. If this ever goes sideways with the IRS, you want a documented file, not a memory.
Step 2: Contact Your Broker
For actual errors — wrong proceeds, phantom transactions, duplicates — you need to go to the source.
Contact the issuer immediately. See “Filer” on the top left corner of Form 1099-DA to find out the name and contact information of the issuer.
When you contact them:
- Have your account number and the specific transaction(s) in dispute ready
- Cite the exact box and amount in question
- Provide your own records showing what the correct figure should be
- Ask explicitly for a corrected 1099-DA (a form with the “CORRECTED” checkbox marked)
- Get the request and any response in writing — email, not chat
Request a corrected form from the issuer. Keep a copy of the corrected Form 1099-DA with your records, along with any correspondence you have with the issuer.
One thing worth knowing: don’t contact the IRS — they can’t correct your Form 1099-DA. The IRS receives what the broker sends. The broker has to issue the corrected version.
What If the Broker Is Slow?
Don’t wait to file your taxes. This is the IRS’s own guidance, and it matters. If your broker is dragging its feet on a correction, file using your best available records and document why your reported figures differ from the 1099-DA. A tax preparer can help you structure that explanation correctly on Form 8949.
If a corrected 1099-DA arrives after you’ve filed, you may need to file an amended return (Form 1040-X). Not the end of the world, but avoidable with good recordkeeping from the start.
Step 3: Reconstruct Your Cost Basis — Regardless
This step applies to almost everyone who received a 1099-DA for 2025. Even if your broker’s proceeds figures are accurate, the basis is almost certainly not reported.
A blank or $0 basis does not mean you paid nothing; it means the broker did not provide that information. You must reconstruct your actual cost from your own records to avoid reporting phantom gains.
What “reconstruct” means in practice:
- Pull purchase confirmations, exchange receipts, and wallet records showing when you acquired each asset and what you paid (including fees)
- Match those acquisitions to the specific lots sold using your chosen cost basis method (FIFO, HIFO, specific ID — whichever you can document)
- Calculate your actual gain or loss per transaction
The moment you move crypto off-exchange, the broker’s basis visibility is broken. If you bought BTC on one exchange, moved it to a hardware wallet, and sold it on a different exchange — that selling exchange has zero knowledge of your purchase price. Its 1099-DA will show 100% of your sale proceeds with no offset. That’s not an error in the legal sense; it’s a structural limitation of the current reporting regime. Your job is to supply the correct basis on your return.
For complex multi-chain histories, this is genuinely difficult work. It’s also where most DIY filers get into trouble. If your transaction history spans multiple exchanges, self-custody wallets, DeFi protocols, and bridges, see our guide on missing cost basis and the missing cost basis solution page for a more detailed breakdown of how to approach reconstruction.
Step 4: Report Correctly on Form 8949 — Even If the 1099-DA Is Wrong
This is the critical part that many filers miss: you must report the correct figures on your return, even if they differ from your 1099-DA.
Whether or not you receive a Form 1099-DA, you must report all income, gains, and losses from digital asset transactions on your federal income tax return.
Recipients carry the data from Form 1099-DA to Form 8949 and Schedule D (Form 1040). On Form 8949, you’ll enter your actual proceeds and your reconstructed cost basis. If your figures differ from what your broker reported, use the adjustment columns to reconcile — and document why.
For noncovered securities (which is almost everything on a 2025-year 1099-DA), all digital asset transactions belong in boxes G/H/I (short-term) and J/K/L (long-term) on Form 8949. For most 2025 filers, Box H (short-term, basis not reported) and Box K (long-term, basis not reported) will be the most common, because brokers are generally not reporting basis this year.
Your Form 8949 proceeds need to match what the exchange reported to the IRS. Filing without reconciling risks a mismatch that could trigger a notice. If your corrected amounts differ from the 1099-DA, document the discrepancy explicitly.
A Note on the IRS Matching System
The IRS uses automated matching to compare what brokers report against what taxpayers file. If your return shows different proceeds than what your broker sent to the IRS, that discrepancy can generate a CP2000 notice — an automated underreporter flag. A CP2000 isn’t an audit; it’s the IRS asking you to explain the difference. But it’s far better to pre-empt it with a well-documented 8949 than to receive one and scramble to explain it after the fact.
When You Need a Corrected 1099-DA vs. When You Don’t
To keep it clean:
| Situation | Need a Corrected 1099-DA? |
|—|—|
| Cost basis is blank or $0 | No — fix it on your return |
| Proceeds off by a few dollars (rounding/fees) | Usually no — document and adjust |
| Proceeds significantly overstated | Yes — contact broker |
| Transaction you didn’t make | Yes — contact broker immediately |
| Duplicate transaction | Yes — contact broker |
| Transfer misclassified as a sale | Yes — contact broker |
| Wrong holding period | Possibly — depends on magnitude |
You usually do not need a corrected 1099-DA for missing cost basis. Missing basis is something you fix on your return, not by forcing the broker to know what it never knew.
The Bigger Picture: What This Year Is Teaching Us
The 2025 tax year is the first year of mandatory 1099-DA reporting, and it’s exactly as chaotic as you’d expect from a brand-new form applied to an asset class that didn’t exist when most tax infrastructure was built. For transactions occurring in calendar year 2025, the IRS will not impose penalties for failure to file and to furnish Forms 1099-DA if the broker makes a good faith effort to file the Forms 1099-DA and furnish associated payee statements correctly and on time. That transitional relief is for brokers, not taxpayers — you still have to file correctly.
2025 Forms 1099-DA will not include cost basis data, so investors must calculate it themselves — and only on a wallet-by-wallet basis, according to new IRS guidance.
The structural cost basis gap isn’t going away quickly. Starting with assets acquired on or after January 1, 2026, exchanges will begin reporting cost basis for “covered” securities — but only for assets that were purchased and sold on the same exchange without ever being transferred. The moment you move crypto off-exchange, the broker’s basis visibility is broken. Anyone with multi-exchange or self-custody activity will continue to face the reconstruction burden for years.
For now: document everything, request corrections where they’re genuinely warranted, and file accurately based on your own records. That’s the entire playbook.
If your transaction history is complex enough that this feels like a second job, browse our work at the Insights hub or reach out directly. This is what we do.
This post is educational and does not constitute tax advice. Your situation may differ materially from the general scenarios described here. Consult a qualified tax professional before filing. For the authoritative IRS source on Form 1099-DA, see irs.gov/form1099da and the IRS guide to understanding your Form 1099-DA.
FAQ: 1099-DA Errors — What to Do
Q1: My 1099-DA shows a huge number in proceeds. Does that mean I owe tax on all of it?
No. Proceeds are the gross amount you received from selling. Your taxable gain is proceeds minus your cost basis (what you paid, plus fees). If the cost basis box is blank, that doesn’t make your entire proceeds taxable — it means you need to supply your own basis on Form 8949. A $0 or “unknown” cost basis on your Form 1099-DA does not make your entire sale taxable. Report your own accurate cost basis on Form 8949.
Q2: Do I need to wait for a corrected 1099-DA before I file?
Don’t wait to file your taxes. If you’re waiting on a correction for an actual error, file using your best records and document the discrepancy. If a corrected form arrives later, you may need to amend — but missing the filing deadline creates its own problems.
Q3: My broker won’t correct the 1099-DA. What do I do?
File using your actual records and document the discrepancy clearly on Form 8949. Keep all correspondence with the broker. If the discrepancy is large enough that it could trigger an IRS notice, a tax preparer can help you structure the explanation properly in your return so the mismatch doesn’t look like an omission.
Q4: A transfer from my hardware wallet to Coinbase is showing up as a sale on my 1099-DA. Is that an error?
Potentially, yes. An inbound transfer to an exchange is not a taxable disposition — it’s moving your own property. If the broker incorrectly classified an internal transfer as a sale, that’s a genuine error and you should request a correction. Document the on-chain transaction showing the wallet-to-exchange transfer with no counterparty sale.
Q5: Can the IRS fix my 1099-DA if my broker won’t?
Don’t contact the IRS — they can’t correct your Form 1099-DA. The IRS receives what the broker reports. Only the broker can issue a corrected version. Your recourse if the broker refuses is to file correctly on your return, document everything, and — if it escalates — work with a tax professional on responding to any subsequent IRS correspondence.
Q6: I moved crypto between exchanges before selling. My 1099-DA shows no basis. Do I have to use $0?
Absolutely not. You usually do not need a corrected 1099-DA for missing cost basis. Missing basis is something you fix on your return, not by forcing the broker to know what it never knew. Reconstruct your actual purchase price from your original exchange records and report that on Form 8949. For a detailed walkthrough of how to approach this, see our missing cost basis guide and the solution page.
Q7: What if I just got a 1099-DA for an account I haven’t used in years — and I have no records?
This is a harder problem, but not a hopeless one. Start by requesting your complete transaction history directly from the broker — exchanges are required to maintain records and many will produce exports going back several years. Blockchain explorers can also help you reconstruct on-chain activity. If you genuinely cannot reconstruct basis, there are IRS-accepted methods for reporting in those circumstances — but the outcomes vary. This is a situation where professional help is worth the cost.
Need help with your crypto taxes? Mike Ring and the BCTP team handle the messy stuff — multi-chain DeFi, 1099-DAs that don’t add up, prior-year amendments. Free consult at cryptotaxprep.io or call 410-216-4632.
This isn’t tax advice. Talk to a professional about your specific situation.
