Form 1099-DA: Why Your Crypto Cost Basis May Be Missing
By Toring Consulting Services, Inc.
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As of August 26, 2026
Question: Why does my Form 1099-DA show a sale but not enough cost-basis information to calculate gain or loss?
Short answer: Form 1099-DA reporting is expanding, but not every transaction will include basis. Your records may still be needed to establish basis, holding period, fees, transfers, and the tax result.
A form is a starting point, not a completed calculation
For sales after 2025, brokers generally report gross proceeds for digital assets. Basis reporting applies to covered securities and is voluntary for noncovered securities. A blank basis field does not itself establish a zero basis or prove broker error.
Why basis may be missing
Basis can be difficult to reconstruct when assets moved between wallets or platforms, were purchased in multiple lots, were received as income or rewards, or were exchanged. Digital assets acquired before January 1, 2026 are generally noncovered, and an outside transfer into a broker can affect covered status.
Build a transaction file
For every sale or exchange, retain the Form 1099-DA, transaction export, acquisition record, wallet or platform transfer history, and documents for any income, gift, inheritance, staking, mining, airdrop, fork, or other basis-establishing event.
Report the transaction, then resolve the record gap
The taxpayer still reports the disposition on the applicable return schedules even when a broker basis field is blank. If a form is missing or wrong for a transaction the broker should have reported as covered, ask the broker about a correction and retain the request.
Cost-Basis Reconciliation Worksheet
Asset, units, sale date, reported proceeds, and fees.
Acquisition date, source, and cost or income-recognition evidence.
Wallet and platform transfers with transaction IDs.
Proposed lot, holding-period evidence, and open questions.
Educational information only, not individualized tax, legal, accounting, or financial advice. This guide provides general information and should not be construed as tax or legal advice. Please consult with qualified professionals for advice specific to your situation. Digital-asset reporting rules can change; verify the instructions for the year of sale and your facts before acting.