How Crypto Tax Form 1099-DA Works in Its First Filing Season

Form 1099-DA is the tax form digital-asset brokers — exchanges, hosted wallets and payment processors — file with the IRS to report their customers' sales of cryptocurrency, and its first live use covers 2025 transactions, with filings arriving through the 2026 filing season. It is the crypto-market version of the 1099-B that stock brokers have filed for decades: proceeds reported to the government by the venue, a copy to the taxpayer, and an expectation that the taxpayer's return squares with both. Basis reporting on the form begins for transactions in 2026, meaning the first season matches proceeds to taxpayer-computed numbers.

Bitcoin Trader publishes information, not tax or legal advice. Tax rules are fact-specific; readers should address their own situations to a qualified professional.

Why does 1099-DA exist?

Congress required it in the 2021 infrastructure law, directing brokers to report digital-asset sales the way securities brokers report stock sales. The rules were finalized by the Treasury and IRS after years of rulemaking, and exchanges began customer due-diligence collection — legal names, taxpayer identification numbers — in 2024-2025 ahead of the first data collection. The form's purpose is visibility: the IRS receives proceeds data it previously had to estimate, and the well-documented reporting gap on crypto transactions narrows by construction.

The deadline mechanics match the securities world. For 2025 transactions, brokers file with the IRS and furnish copies to customers in early 2026, in time for tax season. Starting with 2026 transactions, basis — the cost figure needed to compute gain or loss — transfers between brokers on the form as well, closing the basis-disappears-when-you-switch-venues problem that generated so many amended returns.

What does the form actually report?

For each covered sale, the venue reports gross proceeds — the amount the sale returned — along with the date of acquisition and sale, a description of the asset, and whether the transaction was payment for goods or services. In the first season, basis is the taxpayer's own responsibility: the 1099-DA shows proceeds, and the taxpayer computes cost basis from their own records to arrive at gain or loss. Broker-reported basis applies to transactions in 2026 and later, and only for assets acquired on that venue after the effective dates.

Two boundaries matter. The form covers sales through custodial venues — not self-custodied wallet-to-wallet transfers, which remain unreported by third parties. And proceeds are reported per sale, not per account: active traders can expect dense multi-page forms, with each disposal — including crypto-to-crypto swaps, each a taxable event under IRS treatment — carrying its own line.

What should a taxpayer do when the form arrives?

Reconcile, then compute. The mechanical checklist: match the form's transactions against the venue's own records and your exported history; correct discrepancies with the broker before filing if any exist; compute basis for each disposal from your records — specific identification where the venue's accounting permits it, defaulting to the rules that apply otherwise; and attach the numbers to Schedule D and Form 8949 as with any other property disposition. Crypto-to-crypto trades, spends, and sales all count as dispositions; transfers between your own wallets do not.

The classic first-season traps are stablecoin churn — thousands of small disposals from trading in and out of dollar tokens — and airdropped or staked income with a zero basis that converts directly into gain at sale. Records are the entire defense: the IRS accepts its forms as presumptively correct, and the taxpayer bears the substantiation burden for basis.

What changes for self-custody and DeFi users?

For pure self-custody, the immediate change is none: wallet-to-wallet transfers are not broker-reported events, and the obligation to report dispositions has existed all along — the form simply does not create a paper trail for it. The 2025 rulemaking's attempt to sweep certain DeFi front-ends into broker definitions was vacated in litigation in 2025, leaving non-custodial interfaces outside the reporting regime as of this season; Congressional proposals to revisit the perimeter continue, so the boundary may move again.

What does not change is the underlying tax treatment: property rules apply regardless of custody. A swap executed on a decentralized exchange is as taxable as one on a custodial venue; the difference is only who tells the IRS. Taxpayers transacting across both worlds keep their own books either way.

What happens if a form is wrong or ignored?

Matching: the IRS's systems compare broker filings against returns, and discrepancies generate notices — automated letters proposing adjustments based on the reported proceeds with no basis offset. Since the IRS treats proceeds-without-basis as potentially all gain, an ignored 1099-DA can produce a startling proposed bill for what was, in reality, a small gain or a loss. Corrections start with the broker for factual errors and proceed through the return if the broker's data stands.

The IRS's own materials on digital assets — including the virtual-currency question on the return itself and the form's instructions — are the primary reference, and the agency's enforcement posture has tightened with data in hand: visibility first, campaigns after. The first 1099-DA season is exactly that visibility arriving.

What records does a crypto user actually need to keep?

The tax computation the form demands — gain or loss per disposal — is only as good as the underlying records, and the burden of producing them sits with the taxpayer. The durable standard is a per-transaction log with five fields: the date and time, the asset and amount disposed, the proceeds in dollars at disposal, the acquisition date and cost basis of the units disposed, and the venue or wallet involved. Acquisition records matter as much as sales: basis comes from purchase confirmations, receipts of payments received, and fair-market values at the time income arrived — every airdrop, staking reward or payment-in-crypto is income at receipt value and a cost basis of that same value.

Practical bookkeeping divides by custody life. Venue histories export cleanly and should be exported regularly — not just at tax time — because venues have been known to sunset data access. Self-custody activity requires wallet-level tracking, which means recording transfers between your own addresses as non-taxable moves with identifiable links, or the eventual sale becomes an unprovable basis claim. And the retention horizon is measured in years from filing, not months: amended filings, IRS notices and future disposals of long-held assets all reach back for the same records. The cheapest day to reconstruct a transaction log is the day of the transaction; the most expensive is the day a notice arrives.