Keep crypto records while the details are still easy to find

A useful crypto record explains what happened, when it happened and how you valued it. Collect the evidence while your accounts and transaction history are available, rather than trying to reconstruct a year from a balance screenshot.

Start with events, not just holdings

Buying, selling, swapping, receiving rewards and moving assets are different events. A year-end token balance alone does not explain those events or their possible tax treatment.

The IRS asks U.S. taxpayers to maintain transaction records and information such as dates, units, value and basis. HMRC’s UK record guidance includes transaction details and values in pounds. These are jurisdiction-specific requirements, not a universal filing checklist.

The practical lesson is to preserve both the asset movements and a consistent valuation trail. Determine the applicable rules for your own location before calculating tax.

A private record you can maintain

• Date and time, with a clear timezone.
• Asset and units sent or received.
• Event type and the accounts or wallets involved.
• Local-currency value at the relevant time, with the price source or method.
• Fees, payment currency and receipts.
• Transaction reference or provider statement.
• Original acquisition information and an explanation of any gaps.

This is an organizational starting point, not a determination of which costs are deductible or which accounting method you should use.

Make transfers explainable

If you move assets between accounts you control, retain evidence of both ends. A withdrawal in one export and a deposit in another may otherwise look like unrelated events. Document why you believe the movement is an own-account transfer; do not simply assume every outgoing transaction fits that category.

Fee payments can need separate consideration. Rules can distinguish moving your own asset from disposing of crypto to pay a fee. Keep the fee details even if the main movement appears straightforward.

Protect the records too

Exports may expose balances, wallet addresses and account identifiers. Store them privately with sensible access controls and backups. Never include recovery phrases, private keys or account passwords in a transaction spreadsheet.

A blockchain record can show a transfer but may not explain a service fee, local-currency valuation or who controlled each account. Provider exports and your own notes can help fill those different evidence needs.

If you discover missing information, label it unknown and identify the original source you need. Do not invent an acquisition date or cost to make a report balance.

Your next action

Export your available history through the provider’s official route and reconcile one recent transaction across its receipt, wallet record and local-currency value. Write down missing fields. Use that small check to improve the record process before attempting a whole tax year.

Related guide: Keep the sale receipt separate from the later bank withdrawal.

Sources and review

Checked 12 October 2026. Source dates describe underlying publications, not new events today. Provider documentation describes stated terms and does not prove safety or suitability.

• IRS: digital assets — Current guidance checked; page includes phased reporting dates; U.S. federal tax only.
• HMRC manual: crypto record keeping — Current manual checked; UK records; GBP valuation.

General education, not a recommendation to buy, sell or use a provider. Crypto can lose value; access, fees and legal treatment vary. Tax examples do not determine your obligations. We review changing provider and legal details monthly, security fundamentals quarterly, and material known changes sooner. Material corrections are dated on the page.