Crypto tax season 2026 just changed in a way most investors are not prepared for. For the first time in the history of digital asset taxation, your exchange sent your transaction data directly to the IRS before you filed anything. Not a summary. Not an estimate. A Form 1099-DA with your name, your transactions, and your proceeds sitting in an IRS database right now, waiting to be matched against whatever you report on your return.
This is not a hypothetical shift. It is live as of the 2025 tax year. If you traded crypto on a centralized exchange in 2025 and you are a US taxpayer, the IRS already has your numbers. The question is whether your numbers match theirs.
What Changed: Form 1099-DA Is Now Mandatory
Form 1099-DA, officially called Digital Asset Proceeds From Broker Transactions, is the IRS’s new information return for crypto. It works the same way the 1099-B form has worked for stock trades for decades. Your custodial broker reports your transaction proceeds to both you and the IRS simultaneously. The requirement stems from changes to Internal Revenue Code section 6045 made by the Infrastructure Investment and Jobs Act, signed in 2021. It took four years to implement. It is now live.
Every centralized exchange operating in the US, including Coinbase, Kraken, and Gemini, was required to issue 1099-DA forms for 2025 transactions by February 17, 2026. Many missed that deadline. The IRS confirmed it will not penalize brokers for late filing in 2026 as long as they make a good-faith effort to comply. So your form may arrive late. That does not mean you can file late.
The phase-in works like this. For 2025 transactions, brokers report gross proceeds only. Starting with 2026 transactions, mandatory reporting expands to include cost basis for covered securities. The IRS is building its full picture in stages. This year is stage one.
The Crypto Tax Trap Most Investors Will Walk Into
Here is the problem that nobody is explaining clearly enough.
For 2025 transactions, your 1099-DA shows what you sold your crypto for. It generally does not show what you paid for it. Brokers are not required to report cost basis for 2025 transactions, only gross proceeds. If Box 1g on your form is blank, you are responsible for determining and reporting your own cost basis from your personal records.
This matters because of how IRS automated matching works. The IRS sees your proceeds. If you do not report your cost basis correctly on Form 8949, the system treats your entire proceeds as taxable gain. Buy Bitcoin at $40,000, sell at $70,000, fail to document your cost basis and the IRS’s database registers a $70,000 gain rather than a $30,000 one. That discrepancy triggers an automated notice. You then have to prove what you actually paid, after the fact, while the IRS has already generated a tax bill.
This is not a corner case. It is the default outcome for any investor who files from their 1099-DA alone without reconciling it against their actual purchase records.
Who Gets Hit Hardest by the New Crypto Tax Rules
The 1099-DA framework was designed for simple custodial trading. It works cleanly if you bought Bitcoin on Coinbase in 2025 and sold it on Coinbase in 2025. Most crypto investors do not operate that way.
If you transferred assets between wallets or exchanges, your cost basis information does not travel with the transfer. The receiving broker has no record of what you originally paid. Assets acquired before January 1, 2026 are classified as noncovered securities meaning basis reporting for those holdings is optional for brokers, not mandatory. The IRS may have your proceeds. It almost certainly does not have your basis. That gap is yours to fill.
DeFi users face a different version of the same problem. IRS Notice 2024-57 granted brokers temporary relief from reporting on purely on-chain transactions, including smart contract interactions, AMM trades, liquidity pool transactions, and staking rewards earned outside custodial environments. That relief means those transactions will not appear on a 1099-DA. It does not mean they are not taxable. The IRS has been unambiguous: all crypto income must be reported on your federal return regardless of whether a form was issued.
Stablecoin users are not exempt either. Swapping USDC for USDT through a custodial broker is a reportable disposal under the current rules. People who never made a speculative gain in their lives are receiving 1099-DA forms for routine stablecoin activity they never considered taxable.
The universal cost basis method, which previously allowed investors to treat holdings across multiple wallets as a single combined pool, has been eliminated. The IRS now requires per-wallet or per-account basis tracking. If you hold Bitcoin across three wallets and a hardware device, each position needs its own cost basis documentation. Retroactively reconstructing that across years of transactions is the compliance challenge nobody warned retail investors about.
What the IRS Quietly Acknowledged
IRS Notice 2025-33 extended broker relief from backup withholding obligations through calendar year 2026, delaying full enforcement to January 2027. The stated reason was that broker systems remain under development and operational barriers still exist. That is the IRS acknowledging in its own language that the reporting infrastructure it is requiring is not fully ready to enforce what it is now collecting.
The IRS is gathering data faster than it can process it cleanly. The transitional relief notices, 2024-56, 2024-57, and 2025-33, are the government building the machine while it is running. For investors that means enforcement consequences are coming in stages, not all at once. 2025 is gross proceeds. 2026 adds mandatory cost basis for covered securities. Each year the picture the IRS holds of your crypto activity gets more complete and more actionable.
What to Do Before April 15
Do not file from your 1099-DA alone. The form reflects what your broker reported, not your complete picture. Reconcile it against your own records across every wallet and exchange you used in 2025. Tools like Koinly can reconstruct your transaction history automatically.
Track your cost basis independently. Revenue Procedure 2024-28 allows taxpayers to allocate unused basis to remaining digital assets across wallets as of January 1, 2025. That guidance exists because the IRS knows the 1099-DA alone is structurally insufficient for accurate reporting.
Report each transaction with the correct acquisition date, cost basis, and proceeds on your return. If your 1099-DA shows missing or incorrect basis, Box 1g blank or Box 9 checked, you are responsible for supplying the correct information. Waiting for your exchange to fix it is not a filing strategy.
If you used DeFi protocols, moved assets between wallets, or hold pre-2026 assets with undocumented basis, consider working with a CPA who specifically covers digital assets. The complexity of noncovered securities treatment and cross-platform basis reconstruction is not a standard tax software problem.
The Bigger Picture on Crypto Tax Reporting
The 1099-DA is not a crypto tax reform. It is a surveillance infrastructure project that happens to involve a tax form.
The IRS is not primarily interested in whether you correctly calculated your gains on a Uniswap trade in March 2025. It is interested in building a comprehensive database of custodial crypto activity that can be cross-referenced against blockchain analytics and wallet-clustering tools to identify unreported on-chain transactions. The 1099-DA is the on-ramp. The off-ramp is enforcement against anyone whose reported gains do not reconcile with what the chain shows.
This is the state’s response to the one thing it cannot control directly: Bitcoin’s fixed supply and self-custody properties. The 20 millionth Bitcoin was mined earlier this month, leaving just over 1 million left to ever exist. No 1099-DA changes that number. What the form does is create financial friction around the act of moving between Bitcoin and fiat, making the exit taxable, visible, and documented. That friction is deliberate. The separation of money and state that Bitcoin was designed to enable is precisely what the broker reporting regime is designed to monitor.
None of that changes what you are legally required to do before April 15. It is worth understanding what the form actually represents beyond the checkbox on your tax return.
The crypto tax rules changed in 2026. The IRS already has your numbers. The only question is whether yours match.
