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Before filing a U.S. federal return, reconcile your crypto records across every exchange, hosted account, and self-custody wallet you used. Match apparent transfers, verify duplicate-looking entries against original records, and recover the acquisition details needed to support cost basis and disposition proceeds. A broker tax form or one exchange’s tax report is evidence—not a complete transaction history.
Gather the complete history before editing anything
Start with every exchange, hosted wallet, self-custody wallet, and relevant account used during the period you are reconstructing, including accounts you no longer use. Download transaction histories, trade details, deposit and withdrawal records, statements, and tax documents. Keep untouched copies of the original files and note when each was downloaded.
The IRS requires taxpayers to keep records sufficient to establish the positions taken on federal income tax returns. See the IRS digital assets guidance. Tax-software guidance also warns that incomplete transaction history can lead to basis errors or digital-asset allotment errors; see TurboTax’s guidance on fixing a digital asset allotment error.
Do not assume a platform’s report covers activity elsewhere. Coinbase says Coinbase.com tax activity excludes Coinbase Wallet and legacy Coinbase Pro activity. It also notes that an incoming deposit from an external wallet may not include the original purchase information. Check Coinbase’s tax documentation and Tax Resource Center for those scope limits.
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Find gaps by comparing imports with original records
For each account or wallet, record the date range covered by the import and compare its entries with the original export or wallet history. Check the start and end of each period as well as the middle: an export may begin after the asset was acquired or stop before a later sale.
- Look for purchases or deposits that appear in the source export but not in the tax ledger.
- Look for withdrawals with no corresponding destination record.
- Check whether a transaction type is unsupported by the importer or was left out.
- Identify manual entries made before importing the same activity through an API or CSV.
- Record the source, original transaction identifier if available, timestamp and timezone, asset, quantity, transaction type, fees, and import method for each relevant row.
Maintain a correction log that states what you changed and what evidence supports the change. Do not silently overwrite source data. For import troubleshooting, see TurboTax’s digital asset import guidance.
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Trace apparent transfers in both directions
A transfer between wallets, addresses, or accounts that belong to the same taxpayer is generally non-taxable under the IRS digital-asset FAQ, even if an exchange issues an information return. The transfer still needs to be documented so it is not mistaken for a sale, an unrecorded acquisition, or two unrelated transactions. See the IRS FAQ on virtual currency transactions.
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- Search the receiving wallet or exchange for an inbound transaction with a compatible asset, amount, and time.
- Allow for network fees and differences in timestamp or timezone; the incoming amount may be lower than the outgoing amount when a fee was deducted.
- Confirm that both accounts or wallets belong to you before treating the movement as a self-transfer.
- Keep the evidence that links the two sides, such as matching transaction identifiers, exchange records, or wallet history.
An unmatched withdrawal does not prove that a taxable sale occurred. It may point to a missing destination wallet, a different transaction type, or an incomplete record. ZenLedger describes missing wallets, duplicates, and timestamp order as possible explanations for a presumed self-transfer; treat these as leads to check against source records, not automatic corrections. See ZenLedger’s missing-transaction troubleshooting guide.
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Verify duplicate-looking entries before removing them
Compare suspicious rows against the original exchange export or blockchain history. Use transaction identifiers where available, then compare timestamp, asset, quantity, direction, fee, and source. An API import and a CSV import may overlap, or a manual entry may duplicate a later import. Import documentation identifies both as possible causes of duplicate rows; see Koinly’s duplicate-transaction guidance and Kraken’s U.S. tax documentation.
Do not remove two entries solely because their amounts match: separate legitimate trades can have the same quantity or similar value. If a row is confirmed as a duplicate, preserve the original source records and note in your correction log why it was removed, ignored, or corrected.
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Reconstruct acquisition basis and disposition proceeds
For each acquired lot that is relevant to a later sale or other disposition, gather the asset, number of units, acquisition date and time, U.S.-dollar cost or fair market value, and supporting transaction record or statement. For each disposition, gather its date and time, units disposed of, fair market value, and money or property received. IRS guidance discusses basis in U.S. dollars and records for identifying specific units; see the IRS digital assets guidance and Publication 551, Basis of Assets.
Do not use the date an exchange received a deposit as a substitute for the original acquisition date. Coinbase says it may use a deposit date as an internal placeholder for assets transferred from an external wallet, and advises using the actual acquisition date when calculating the holding period. Find the original purchase or receipt record where possible; if it cannot be found, document what is missing rather than presenting an unsupported date or cost as established. See Coinbase’s Tax Resource Center.
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Use tax forms as a cross-check, not the ledger
For covered broker transactions effected on or after January 1, 2025, brokers report gross proceeds on Form 1099-DA. For 2025 activity, most statements will not include basis; basis reporting applies to certain covered broker transactions effected on or after January 1, 2026. These phase-in dates and qualifications are described by the IRS digital asset filing guidance.
Compare broker forms and platform tax summaries with your reconciled transaction ledger, but do not treat either as a complete history. Coinbase.com reports, for example, exclude Coinbase Wallet and legacy Coinbase Pro activity. If a form differs from your reconstructed records, keep both and identify whether the cause is a missing record, duplicate, period mismatch, or different transaction classification. Do not change figures merely to force the ledger to match a form.
Know what this reconciliation can and cannot establish
This workflow addresses recordkeeping and reporting for U.S. federal filing. It does not determine the tax treatment of every transaction, including particular DeFi, staking, wrapped-token, gift, or business-activity scenarios, and it does not cover state or non-U.S. rules. If the classification or tax result remains uncertain after the records are reconciled, consult a qualified tax professional.
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