To calculate what you actually made on a one-time crypto purchase and sale, subtract your purchase outlay, investment fees, and tax attributable to the sale from the sale proceeds. Divide that after-tax profit by your total invested outlay and multiply by 100 for the percentage return. Keep this investment-performance calculation separate from taxable gain: under U.S. federal rules, gain or loss generally equals amount realized minus adjusted basis, and those figures may treat fees differently.
Calculate your investment return after costs and tax
For one purchase followed by one sale, with no deposits or withdrawals in between, use:
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After-tax profit = sale proceeds − acquisition outlay − all investment fees − tax attributable to the taxable disposition
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After-tax return (%) = after-tax profit ÷ total invested outlay × 100
Use the actual amounts that affected your finances. Acquisition outlay is what you paid to obtain the position; include fees in your investment ledger, whether or not they qualify for a particular tax treatment. Sale proceeds are the value you received when you disposed of the position. The tax amount is not a universal percentage: it depends on the applicable tax rules and your circumstances.
For example, if you invested $1,000, paid $10 in investment fees, later received $1,300 on sale, and owed $60 in tax attributable to that disposition, your after-tax profit is $230. Your after-tax return is $230 ÷ $1,010 × 100, or about 22.8%. This illustration is arithmetic, not a tax-rate estimate.
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When there are multiple transactions or cash flows
A single percentage can mislead if you made purchases at different times or added or withdrew money during the investment period. Record each cash flow and its date, then state which return convention you use. A time-weighted return focuses on investment performance while accounting for external cash flows; a money-weighted return reflects the amount and timing of the investor’s contributions and withdrawals. Do not apply the one-purchase formula to a multi-flow history without accounting for timing.
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For a U.S. federal sale of a digital asset treated as a capital asset, the basic calculation is:
Taxable gain or loss = amount realized − adjusted basis
The IRS describes gain or loss as the difference between adjusted basis and amount realized. For a cash sale, amount realized generally starts with cash received, plus the fair market value of any services received, and is reduced by digital-asset transaction costs allocable to that disposition. Basis generally starts with the asset’s U.S.-dollar acquisition cost; qualifying acquisition fees may be included in basis. See IRS digital-asset FAQ answers 52 and 53 and the IRS virtual-currency FAQ.
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This taxable gain or loss is not necessarily your full economic profit. Your investment ledger tracks every cost that reduced your wealth, while the tax calculation uses tax-defined basis, proceeds, and qualifying costs. Keep both calculations rather than treating them as interchangeable.
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Account for fees according to what they paid for
For investment performance, record every fee that reduced your holdings or cash balance. For U.S. federal tax calculations, the treatment depends on the service and transaction. The IRS defines digital-asset transaction costs as amounts paid in cash or property for services provided by another to effect a purchase, sale, or disposition. Examples include transaction or “gas” fees, transfer taxes, and commissions. The IRS distinguishes those costs from fees for transferring assets between your own wallets or accounts. See IRS FAQ answer 53.
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- Fees allocable to a disposition: These can reduce the amount realized for tax purposes.
- Qualifying acquisition costs: These may increase basis.
- Transfers between your own wallets or accounts: Do not assume the fee has the same treatment as a fee that effects a purchase or sale.
- Fees paid in crypto: Spending digital assets on a transfer fee can itself be a disposition and may create a separate gain or loss, even if the fee may qualify as a transaction cost. The IRS discusses this in FAQ answer 52.
Save the fee amount, date, asset used to pay it, and service provided. A transaction export that only says “fee” may not give you enough information to determine its tax treatment later.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check the U.S. federal holding period
Under the cited IRS guidance, a capital gain is short-term if you held the asset for one year or less, and long-term if you held it for more than one year. The holding period begins the day after acquisition and ends on the day of sale or exchange. Classification can affect the federal tax calculation, but this guidance does not establish an individual tax rate. See the IRS virtual-currency FAQ.
Keep records that let you reproduce the calculation
The IRS says digital-asset records should document purchases, receipts, sales, exchanges, other dispositions or transfers, and fair market value in U.S. dollars when relevant. Its overview lists the asset type, transaction date and time, number of units, fair market value at the transaction time, and basis as information used to calculate gain or loss. Preserve exchange statements and wallet records that substantiate basis and unit identification. See IRS digital-asset guidance.
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- Date and time of each purchase, receipt, sale, exchange, or transfer
- U.S.-dollar fair market value when relevant
- Acquisition cost and supporting basis records
- Fee amount, payment asset, and the service the fee covered
- Exchange statements and wallet records showing the transaction history
Report taxable transactions using current-year IRS guidance
For individual U.S. federal returns, sales and other capital transactions involving digital assets generally are calculated and reported on Form 8949 and summarized on Schedule D, subject to IRS reporting exceptions. Taxable transactions must be reported for the year they occur even if you do not receive an information return. Check the forms and instructions for the tax year you are filing, because requirements and broker statements can change. See the IRS digital-asset FAQ.
Scope of this calculation
The tax mechanics above describe U.S. federal guidance; they do not determine state or local tax, rules in other countries, or the tax owed by a particular investor. The cited IRS materials address transactions on or after January 1, 2025, and the relevant FAQ answers were added December 15, 2025. For another tax year or jurisdiction, confirm the applicable rules and forms before relying on the calculation.
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