To convert Bitcoin to U.S. dollars, multiply the BTC amount by a BTC/USD rate from a named source and record the rate’s timestamp. To work out a sale’s gain or loss for U.S. federal tax purposes, subtract the asset’s adjusted basis from the amount realized; the sale proceeds are not themselves your profit.
Convert a Bitcoin amount to dollars
Use this calculation:
BTC amount × BTC/USD rate = USD value
For example, if you hold 0.02 BTC and the rate you selected is $60,000 per BTC, the calculation is 0.02 × $60,000 = $1,200. This is an illustration, not a current quote or a tax calculation.
Bitcoin prices move continuously. Different exchanges and data providers may report different rates because they reflect different markets or use different aggregation methods. For a useful record, note the BTC amount, the USD rate, the date and time, and the exchange or market-data source. For U.S. federal tax valuation, IRS Notice 2014-21 says to convert a listed virtual currency into U.S. dollars using an exchange rate applied in a reasonable and consistent manner: IRS Notice 2014-21.
Choose a rate that fits the transaction
Use a source and timestamp that correspond as closely as possible to the transaction you are valuing. Apply your method consistently and keep evidence of the rate you used; an untimestamped price is not a universal value.
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- Exchange transaction: Preserve the exchange’s transaction record and the rate or USD amount it reports.
- Historical estimate: A historical data provider can help locate a past price, but check the date coverage and time granularity. CoinGecko describes historical market-chart and date-specific data, with availability depending on coverage: CoinGecko historical crypto data guide.
- Peer-to-peer or other transaction not facilitated by an exchange: IRS guidance describes fair market value at the time recorded on the distributed ledger; an explorer may be used if it accurately represents the value: IRS virtual currency transaction FAQs.
Calculate gain or loss separately from the USD value
For a sale or other disposition, the relevant calculation is generally:
Amount realized − adjusted basis = gain or loss
The amount realized is not always just the cash received: it can include the value of applicable services received and is reduced by transaction costs allocable to the disposition. The IRS explains this method in its FAQs on digital asset transactions.
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Example: Suppose you acquired BTC for $800, including qualifying acquisition costs, then later sold it for $1,200. If $20 in costs is allocable to that sale, the amount realized is $1,180 and the illustrative gain is $380 ($1,180 − $800). Actual basis, eligible costs, and tax treatment depend on the facts and applicable rules.
Find your adjusted basis
For cryptocurrency you purchased, basis generally begins with the dollars you spent to acquire it, including fees, commissions, and other acquisition costs. Do not replace that historical cost with today’s price. Other ways of acquiring digital assets can have different rules; for example, service income is generally valued in dollars when received. Keep the records that show how and when you acquired or received each asset. See the IRS digital assets overview and virtual currency FAQs.
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Account for transaction costs carefully
Some costs for services that effect a purchase, sale, or disposition may be relevant to basis or amount realized. IRS guidance identifies qualifying transaction or gas fees, transfer taxes, and commissions among digital asset transaction costs. But fees are not interchangeable: costs for moving assets between wallets you own are treated differently from costs that effect a disposition. Do not assume every network or transfer fee reduces a taxable gain. Check the applicable IRS guidance for your transaction type: digital asset transaction FAQs.
Keep records that support the calculation
Retain records for acquisitions, receipts, sales, exchanges, dispositions, and transfers. For each relevant transaction, save the asset type, date and time, units, USD fair market value, source of that value, and basis information. Exchange statements, wallet records, transaction IDs, and dated price data can help substantiate the figures you report.
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Form 1099-DA may report proceeds and, in some cases, basis for covered broker transactions. It does not necessarily provide your complete basis history, and receiving it does not remove the obligation to report taxable digital asset income, gains, or losses. See the IRS explanation of Form 1099-DA.
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For applicable digital assets held as capital assets, the IRS points taxpayers to Form 8949 for dispositions and Schedule D for the capital gain and loss summary. Some digital asset receipts or income, including certain staking, mining, or service income, may be reported differently. The transaction and your circumstances determine the treatment. Consult the instructions for the tax year at issue, including the IRS Instructions for Form 8949.
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This is a U.S. federal tax orientation, not a determination of state, non-U.S., or taxpayer-specific rules. Tax forms and guidance can change, so use the IRS rules and forms that apply to your tax year.
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