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What to record for every Bitcoin transaction
Keep a dated record for each acquisition and disposition, and retain the exchange, wallet, account, and transaction records that support it. The IRS says records should document transactions and the fair market value of digital assets received as income or business payment. Its digital-assets guidance identifies the type of asset, transaction date and time, units, U.S.-dollar fair market value, and basis as relevant to calculating gain or loss: IRS digital assets guidance.
- For any transaction: asset (BTC), date and time, units, transaction ID or source record, and the wallet, account, or broker involved.
- When acquiring BTC: amount paid or fair market value in U.S. dollars, resulting basis, and relevant transaction costs.
- When receiving BTC as income or payment: receipt date and time, units, U.S.-dollar fair market value, and why and how it was received. The income treatment and later basis can depend on the circumstances.
- When disposing of BTC: units disposed of, date and time, cash proceeds or fair market value of what you received, relevant transaction costs, and the basis of the units assigned to the transaction.
- For fees and transfers: whether a fee was paid in cash or BTC, what service it paid for, and whether a transfer was between your own wallets or accounts. The IRS distinguishes transaction costs from costs of moving assets between your own wallets or accounts; BTC used to pay a transaction service can itself be a disposition. See IRS digital asset FAQs 53 and 97.
- For broker activity: save Forms 1099-DA and account statements alongside your own acquisition and wallet records, not in place of them.
Buying BTC creates an acquisition record: preserve what you paid, when, how much you acquired, and any relevant costs. That record helps establish the basis of the units if you later sell, exchange, or spend them.
When selling, exchanging, or spending BTC can create a gain or loss
If BTC is a capital asset, the gain or loss on a disposition is generally the amount realized minus the adjusted basis of the BTC disposed of. The IRS says amount realized is generally cash received plus the fair market value of services received, reduced by transaction costs allocable to the disposition. Calculate and report the result in U.S. dollars. The detailed rules appear in IRS digital asset FAQs 52–53.
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| Transaction | What to compare and record |
|---|---|
| Sell BTC for U.S. dollars | Cash proceeds, less applicable costs of the disposition, compared with the adjusted basis of the BTC sold. |
| Exchange BTC for a materially different digital asset | The BTC transferred is disposed of. Record its basis and the value received; the received asset’s basis is determined under the applicable exchange rules. The IRS says costs to effect the exchange are generally allocable to the disposed asset rather than added to the received asset’s basis. See IRS digital asset FAQ 72. |
| Spend BTC on a good or service | Record the BTC units and their basis, the date and time, the fair market value of what you received, and applicable fees. Paying with BTC can be a disposition even when no dollars change hands. |
For example, if you acquired BTC at one value and later spent it when the item or service received had a different fair market value, the difference can matter for the tax calculation. The relevant comparison is tied to the units spent and their basis—not simply whether the transaction involved cash.
How to identify the BTC units you disposed of
If you acquired units at different times, the units assigned to a sale or spend can affect both basis and holding period. The IRS’s rules depend on the transaction date and custody arrangement, so do not assume one identification procedure applies to every transaction.
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- Specific identification: IRS FAQ 87 and the digital-assets guidance describe identifying the units before or at the disposition and keeping adequate records to substantiate which units were used.
- Default for certain hosted-wallet transactions: If you do not satisfy the applicable specific-identification requirements, FAQ 87 describes a default acquisition-time order: the earliest-acquired units are treated as disposed of first, regardless of when they were transferred into the hosted wallet.
- 2025 transactions: FAQ 88 describes temporary relief that includes a standing order recorded in the taxpayer’s books and records before disposition.
- Transactions after December 31, 2025: FAQ 88 describes an instruction in place with the custodial broker no later than the sale, disposition, or transfer, using identifiers the broker accepts as sufficiently specific.
For the applicable details, check IRS digital asset FAQs 87–88 and the IRS digital-assets guidance. Keep acquisition and disposition timestamps so you can substantiate the holding period as well as the units selected.
Holding period: short-term or long-term
For a capital asset, a holding period of one year or less is short-term; more than one year is long-term. The applicable tax consequences depend on the transaction and your circumstances. Retaining timestamps for acquisition and disposition helps establish which holding-period category applies. See IRS digital assets guidance.
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Broker reporting on Form 1099-DA applies to transactions on or after January 1, 2025. For 2025 transactions, brokers must report gross proceeds, but generally were not required to report basis. The IRS said on January 28, 2026, that brokers had to furnish 2025 statements by February 17, 2026, and that most would not include basis. For 2026 and later, mandatory basis reporting applies to digital assets that are covered securities; basis reporting for noncovered securities is voluntary under the 2026 instructions. Whether an asset is covered can depend on its acquisition date and other broker and custody facts, so a 1099-DA does not necessarily show your basis. See the IRS’s January 28, 2026 reminder, IRS digital-assets filing guidance, and the 2026 Form 1099-DA instructions.
Reconcile the form with your own purchase, receipt, wallet, and account records. The IRS says reportable income, gains, or losses must be reported whether or not you receive Form 1099-DA. For dispositions of capital assets, the IRS digital-assets guidance points to Form 8949 and Schedule D, subject to the form instructions and information provided by the broker. BTC received as mining or staking income, wages, business payments, or other income is not automatically reported in the same way as a capital-asset disposition.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep transfers between your own wallets distinct from dispositions
A transfer between wallets or accounts you own is not automatically a sale. Record the transfer so your transaction history remains complete, including the units, timestamps, originating and destination wallets, and any fee. The fee’s treatment can depend on its purpose: the IRS distinguishes own-wallet transfer costs from transaction costs, and spending BTC on certain transaction services can itself count as a disposition. The relevant guidance is in IRS digital asset FAQs 53 and 97.
Scope of this guide
This explanation covers U.S. federal income tax guidance. State, territorial, and non-U.S. rules may differ, and a particular transaction’s treatment can depend on its facts and complete records. For advice on your circumstances, consult a qualified tax professional.
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