Learn how digital asset cost basis is calculated, how tax lots and wallet-by-wallet rules work, and how to reconcile Form 1099-DA records.
Digital asset cost basis is the tax investment assigned to units of cryptocurrency or another digital asset. Basis commonly starts with the asset's cost in U.S. dollars plus qualifying acquisition costs, then changes for transfers, gifts, inheritance, income recognition, returns of capital, or other adjustments. Adjusted basis is subtracted from amount realized to calculate gain or loss.
Cost basis is not the current market value, wallet balance, or gross proceeds shown on an information form. It belongs to identifiable units or a permitted pool within the relevant wallet or account.
For a cash purchase, basis generally includes the amount paid plus qualifying digital-asset transaction costs allocable to acquiring the asset. If a digital asset is received for services and its fair market value is properly included in ordinary income, that included value generally becomes basis.
In a taxable exchange, the disposed asset has its own gain or loss calculation. Basis in the newly received asset generally begins with its cost or fair market value under the applicable rules. Current IRS guidance can allocate transaction costs differently depending on whether the exchange involves cash, other property, or materially different digital assets.
Gifts can have a dual basis: one amount for measuring gain and a potentially lower amount for measuring loss. Inherited property commonly receives a basis connected to estate-tax valuation or date-of-death fair market value. A transfer between a taxpayer's own wallets generally carries the existing basis and holding period rather than creating a new fair-market-value basis.
Jordan buys 0.50 bitcoin for $17,750 and pays $250 of qualifying acquisition costs, creating an $18,000 basis. Jordan later sells the identified units for $35,300 and pays $300 of transaction costs properly reducing amount realized. Net amount realized is $35,000, so gain is:
$35,000 amount realized − $18,000 adjusted basis = $17,000 gain
If a report instead subtracts basis from the $35,300 gross figure and ignores the sale cost, gain is overstated by $300. If it omits the acquisition cost, gain is overstated by another $250.
When identical units were acquired at different times and prices, the taxpayer must determine which units were disposed of. Valid specific identification can use details such as acquisition date and time, basis, unit quantity, and a transaction identifier or address sufficient to identify the units under current rules. The identification must be made and documented by the required time.
If adequate identification is not made, default ordering rules generally apply within the wallet or account. Taxpayers should not retroactively select the most favorable lot after seeing year-end prices. Broker elections, standing instructions, and taxpayer records should agree.
Beginning January 1, 2025, final-regulation methodology generally shifted identification from a universal or multi-wallet approach to a wallet-by-wallet or account-by-account framework. Revenue Procedure 2024-28 provided a transition safe harbor for allocating unused basis attached to pre-2025 units among wallets or accounts as of January 1, 2025. The allocation is not a recurring annual election; taxpayers should preserve the transition record.
Form 1099-DA began reporting gross proceeds for certain 2025 broker transactions. For sales effected after 2025, brokers generally must report basis and related information for covered digital assets and may voluntarily report basis for noncovered assets. Certain qualifying stablecoin and specified NFT transactions can use optional reporting methods that do not require basis.
Broker-reported basis may be incomplete when assets were transferred into the account, acquired before coverage, received as a gift, moved through self-custody, or adjusted outside the broker. A blank basis box does not mean basis is zero, and a populated box does not remove the taxpayer's duty to correct known errors.
Taxpayers may need Form 8949 adjustments when reported proceeds, basis, holding period, or transaction classification differs from the correct return treatment. Keep the broker statement, but reconcile it to the complete wallet history.
Software is useful but not self-validating. Duplicate imports, missing transfers, unsupported chains, timezone mismatches, incorrect fee treatment, and mislabeled staking or wrapped-token transactions can materially change gain.
Federal gain or loss on a disposition generally equals amount realized minus adjusted basis. Capital assets use holding-period and Schedule D rules; inventory, dealer activity, compensation, and business property can have ordinary treatment. Lack of documentation can lead to a zero-basis position for an unsubstantiated amount, but taxpayers should first make a reasonable reconstruction from reliable evidence.
California generally uses the federal property framework, but historical state adjustments can create a different basis or carryover. California taxes capital gains at regular rates. Maintain a separate state schedule whenever federal and California amounts diverge.
Heath Income Tax can help reconstruct digital-asset basis, reconcile Form 1099-DA, and document federal and California gain or loss.
Can I choose the highest-basis digital asset units when selling?
Potentially, if the units are eligible and a valid, timely specific identification is made within the correct wallet or account. Otherwise, default ordering rules can apply.
Does a transfer to another wallet reset basis?
Generally no when beneficial ownership stays the same. The original basis and holding period move with the transferred units, while transfer-fee treatment requires separate analysis.
What if Form 1099-DA shows no basis?
Use substantiated acquisition and transfer records to calculate the correct basis. Noncovered or transferred assets may legitimately have no broker-reported basis.
The definitions and examples on this page are for informational purposes only and do not constitute tax advice. Tax laws change frequently and individual circumstances vary. Consult a qualified tax professional before making decisions based on this content.
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