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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →In the United States, selling Bitcoin for less than its adjusted basis generally creates a realized capital loss. You report the disposition on Form 8949, carry the totals to Schedule D, and use the transaction’s holding period to classify it as short-term or long-term. The loss is not recognized merely because the market price fell while you still owned the Bitcoin. This explanation covers an individual holding Bitcoin as an investment under federal income-tax rules; state, foreign, business, DeFi, gift, theft and tokenized-security issues can require separate advice.
What a Bitcoin loss means for federal tax
The Internal Revenue Service treats digital assets such as Bitcoin as property. The general tax rules for property therefore apply when you dispose of Bitcoin. For an investment holder, a sale or other disposition is generally a capital-gain-or-loss transaction.
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A loss is realized when the amount you receive is lower than your adjusted basis. Your basis is generally the U.S.-dollar cost of acquiring the Bitcoin, adjusted for facts such as allowable transaction costs and the way you acquired the asset. A decline shown in an exchange app or wallet is an unrealized loss until a taxable disposition occurs.
The IRS describes the rule this way in the 2025 Form 8949 instructions: “A digital asset is treated as property, and general tax principles that apply to property transactions apply to transactions using digital assets, including how to figure your holding period for short-term and long-term capital gains and losses.”
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Which Bitcoin transactions can create a loss?
Selling for U.S. dollars
When you sell Bitcoin for cash, compare your net proceeds with the adjusted basis of the specific units sold. If net proceeds are lower, the difference is a capital loss.
Exchanging Bitcoin for another asset
An exchange of Bitcoin for another cryptocurrency, property or service is generally a disposition of the Bitcoin. The fair-market value of what you receive is normally used as the proceeds amount, so an exchange can create a gain or loss even when no dollars reach your bank account.
Using Bitcoin to pay
Spending Bitcoin for goods or services also disposes of the units used. Keep the date, units, value received and basis for those units; the payment can produce a gain or loss that must be reported.
Holding through a price decline
If you continue to own the Bitcoin, the decline is not yet a reportable capital loss. You need a sale or another taxable disposition to establish proceeds and calculate the result.
Short-term versus long-term classification
Count the holding period for each lot separately. Bitcoin held for one year or less produces a short-term result. Bitcoin held for more than one year produces a long-term result.
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| Classification | Holding period | Where it is reported |
|---|---|---|
| Short-term | One year or less | Short-term section of Form 8949, then Schedule D |
| Long-term | More than one year | Long-term section of Form 8949, then Schedule D |
The acquisition date and sale date matter. If you bought units in several transactions, do not combine them into one holding period unless your records support that treatment. A sale can contain both short-term and long-term lots.
How to calculate the loss for each lot
Use a separate line for each economically distinct lot or group of lots that has the same required reporting information.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteBasic calculation: adjusted proceeds minus adjusted basis equals capital gain or loss.
- Adjusted proceeds: the value received, reduced by selling costs and other amounts that properly reduce proceeds.
- Adjusted basis: your dollar cost for the units, adjusted as required by how and when you acquired them and by allowable acquisition costs.
- Result: a negative number is a loss; a positive number is a gain.
The IRS says basis records must reflect the acquisition type, acquisition date and time, number of units and fair-market-value information. Exchange exports that show only a total dollar deposit may not be enough to establish basis for every lot.
Example
You buy 0.10 Bitcoin for $4,000 and pay a $40 acquisition fee that belongs in basis, giving you a $4,040 adjusted basis. You later sell the 0.10 Bitcoin for $3,500 and pay a $35 selling fee. Your net proceeds are $3,465. The realized capital loss is $575 ($3,465 minus $4,040). You then classify that $575 as short-term or long-term based on how long that particular lot was held.
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The example illustrates the method, not a universal fee rule. The tax treatment of a particular fee depends on what the fee paid for and the records available.
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How to report a Bitcoin loss on your federal return
- Assemble the transaction data. For every disposition, record the asset description, acquisition date, sale or disposition date, units, proceeds, adjusted basis and transaction costs. Keep the exchange statement, wallet history and trade confirmation supporting each entry.
- Determine the holding period. Classify each line as short-term or long-term using the acquisition and disposition dates.
- Complete Form 8949. Report capital-asset digital-asset dispositions in the appropriate short-term or long-term section. The 2025 instructions use digital-asset-specific boxes G, H or I for short-term transactions and J, K or L for long-term transactions, rather than boxes C or F. Select the box and code that match the information reported for your transaction under that year’s instructions.
- Reconcile the proceeds and basis. Enter the figures from your own records and reconcile them to any broker statement. Do not copy a basis figure that you know is incomplete or incorrect.
- Transfer totals to Schedule D. Form 8949 totals flow to Schedule D, where short-term and long-term results are combined under the capital-loss rules for the tax year.
- Retain the supporting records. Keep acquisition evidence, disposition confirmations, fee details, wallet addresses or transaction identifiers, and your lot-selection method for as long as the records may be needed to substantiate the return.
Form 1099-DA and Bitcoin sales beginning in 2025
Covered brokers began reporting reportable digital-asset transactions occurring on or after January 1, 2025, on Form 1099-DA. The form generally reports gross proceeds and transaction information to you and the IRS.
The IRS has warned that some 2025 Form 1099-DA statements may not include basis. A statement showing proceeds without basis is not evidence that your basis is zero. Reconstruct basis from your purchase records, exchange histories and wallet data, then use the correct basis on Form 8949.
You must report a sale or exchange even if you did not receive Form 1099-DA, Form 1099-B or a substitute statement. Missing paperwork does not eliminate the reporting obligation. Conversely, a 1099-DA entry does not replace your responsibility to check dates, units, proceeds, basis and whether a transaction was actually your disposition.
Does the wash-sale rule apply to ordinary Bitcoin?
Do not assume that the familiar 30-day wash-sale rule automatically applies to ordinary Bitcoin. Current federal materials describe wash-sale adjustments in the context of stocks or securities, while they classify Bitcoin and other digital assets as property. Those materials do not publish a Bitcoin-specific safe-harbor sentence that resolves every ordinary Bitcoin repurchase.
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That means a blanket statement that selling Bitcoin at a loss and buying it back within 30 days is always disallowed is not supported by the cited IRS guidance. The analysis can change when the asset is a tokenized security or another instrument with different legal characteristics. Identify what you actually sold and consult a tax professional when the asset is security-like, wrapped, tokenized or held through a complex arrangement.
Records for custodial accounts and self-custody
Broker or exchange account
- Download trade confirmations showing execution date, units, price and fees.
- Save annual statements and transaction ledgers, including any 1099-DA files.
- Check whether the platform reports basis for each sale or only gross proceeds.
- Document transfers between accounts so you can distinguish a transfer from a sale.
Self-custodied wallet
- Export wallet transaction history and preserve transaction IDs.
- Match on-chain movements to the purchase or sale venue and the correct lot.
- Record the U.S.-dollar value and timestamp used for each taxable disposition.
- Keep evidence for fees paid to the exchange or network and how those fees were treated in your calculation.
Basis software or a cost-basis importer can reduce manual work, but you remain responsible for checking duplicate transfers, missing deposits, incorrect timestamps and unsupported lot assignments before filing.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common mistakes that produce incorrect losses
Reporting an unrealized loss
A portfolio screenshot is not a tax disposition. Report a loss only after a sale, exchange, payment or other event that establishes proceeds.
Using the wrong lot
Applying the first purchase price to a sale without evidence can change both the amount and the short-term-or-long-term classification. Reconcile the lot-selection method to your exchange and wallet records.
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Ignoring fees
Fees can affect proceeds or basis. Leaving them out can overstate or understate the loss. Keep the fee currency, amount and purpose with the transaction record.
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Copying a 1099-DA basis blindly
Some 2025 statements may omit basis, and a reported figure can still be incomplete after transfers between platforms. Treat the form as a reconciliation point, not as a substitute for your records.
Putting digital assets in the wrong Form 8949 boxes
The 2025 instructions added digital-asset-specific short-term boxes G, H and I and long-term boxes J, K and L. Using an older workflow based on boxes C or F can misclassify the transaction.
Assuming a loss is immediately usable without limits
Capital losses first interact with capital gains under Schedule D. If losses exceed gains, the amount usable in the current year and any carryforward are governed by the instructions for the applicable tax year and your circumstances. Use the current Schedule D instructions rather than relying on a remembered limit from another year.
A practical filing checklist
- Confirm that each entry is a sale, exchange, payment or other disposition rather than a continuing holding or a documented transfer.
- Gather acquisition date, time, units, dollar cost, fees and fair-market-value information for every lot.
- Gather disposition date, time, units, proceeds and fees.
- Calculate net proceeds minus adjusted basis for each disposition.
- Separate short-term holdings (one year or less) from long-term holdings (more than one year).
- Reconcile broker reports and Form 1099-DA data to your own ledger.
- Enter digital-asset transactions in the applicable Form 8949 section and 2025 digital-asset box.
- Transfer Form 8949 totals to Schedule D and retain the underlying records.
Situations that need separate advice
This federal investment-holder framework does not settle state income-tax treatment, foreign reporting, business inventory, trust or estate ownership, gifts, theft, mining, staking, lending, decentralized-finance activity or tokenized securities. Those facts can change basis, character, reporting forms or the timing of recognition. Obtain advice specific to your jurisdiction and activity before applying the ordinary investment rules.
If your records are incomplete, reconstruct the transaction history before filing rather than estimating basis from a current price. A tax professional can help document reasonable methods and address discrepancies between wallets, exchanges and broker statements.
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