How to Keep Crypto Records That Survive a Tax Review

When a tax review letter arrives, the hardest part is rarely the tax itself. It is the scramble to reconstruct what you did across several exchanges over two or three years. Nigerian crypto users often discover that the app they used no longer shows an old transaction, that a wallet address they once controlled is now unfamiliar, or that the numbers on a screenshot do not match the numbers in a downloaded file. This guide sets out a recordkeeping routine you can build now, before anyone asks. It covers what to export from the exchanges you use, how to label and store it, how to reconcile the numbers, and which official pages to consult when a figure looks wrong. Nothing here is tax or legal advice, and no exchange can guarantee how any authority will treat your records. The aim is simpler: when you are asked to explain your activity, you should be able to hand over a file that answers the obvious questions without guesswork.

Start with one folder and one naming rule

Pick a single place for crypto records, ideally a folder on an encrypted drive plus a backup that is not on the same device. Create one subfolder per calendar year, and inside each year one subfolder per platform you actually used. Do not mix spot activity, futures activity and peer-to-peer activity in the same file, because they are reported differently and a reviewer will want to see them separately. If you used more than one exchange, give each its own folder and keep the same internal structure so you can compare them later.

Adopt a file naming rule and never break it. A workable pattern is the year, the month, the platform and the report type, for example 2025-03-binance-spot-trade-history. Avoid names like final, final2 or new export, which become meaningless within weeks. When you download the same report twice, keep both and add the download date, because a later export may contain corrections or additional rows that an earlier one did not.

Write a short index file for each year. One line per download: what it is, which platform it came from, the date range it covers, when you downloaded it, and what you still need to chase. This index is the single most useful document in the folder, because it tells you and anyone reviewing the records what exists and what does not.

Export the right reports from each platform

Most exchanges let you download a transaction history, a trade history and a deposit and withdrawal history as separate files. Download all three for each year, even if you think you only traded once. The deposit and withdrawal history is what lets you link money entering the platform to money leaving it, and that link is usually the first thing a reviewer tests. Where a platform also offers a statement or an account summary, take that too.

Check the help centre of each platform for the current name and location of these export options, because menus change and the labels are not identical everywhere. On Binance, OKX, Bybit and Bitget the relevant pages sit under the support or help centre, and the trading fee pages explain how fees are charged, which matters when you reconcile the amounts you actually received. Read the fee page for each platform you used so you can explain why a filled order does not match the gross price you saw on screen.

If you traded futures or other derivatives, export the funding, fee and settlement records as well, not just the trade list. Derivatives generate entries that a spot-only export will not show, and leaving them out creates a gap that is hard to explain later. The futures documentation on the platform you used will describe which records are produced and where to find them.

Download on a schedule rather than once a year. A quarterly download takes a few minutes and protects you against a platform changing its export format, restricting older history, or closing your access. Note in your index file the date of each download so you can prove the records are contemporaneous rather than assembled in a hurry.

Reconcile the numbers before you file anything

An export is not a record until you have checked it. For each year, total the deposits into each platform and the withdrawals out, then compare those totals with your bank statements and your own wallet records. Differences are normal, but you need to know why each one exists: a fee deducted on withdrawal, a transfer between your own accounts, a deposit that arrived in a different month, or a transaction you forgot. Write the explanation next to the discrepancy in your index file while the details are still fresh.

Reconcile trades against fees. The amount credited after a trade is usually less than the headline figure because a fee was taken, and the fee page for your platform explains the structure. If your own arithmetic does not match the export, check whether the fee was charged in the quoted asset, in a discount token, or deducted from the received amount. Do not adjust the export to make it match your expectation. Keep the original file untouched and record your explanation separately.

For peer-to-peer activity, keep the platform's own order record plus your bank or wallet confirmation for the same transaction. A P2P order record alone shows what the platform saw; the bank line shows what actually moved. Where the two disagree, note it and keep both. Reviewers generally prefer a documented discrepancy over a tidy number that cannot be traced.

Set a stop condition for yourself. If a gap cannot be resolved from the exports and your own records, do not invent a figure. Mark it as unresolved, describe what you have already checked, and keep the correspondence or support ticket reference that shows you tried to obtain the missing data.

Store, protect and hand over the records

Keep at least two copies in separate locations, and encrypt the folder that holds them. Exports frequently contain your name, account identifiers, balances and addresses, so treat them as sensitive documents rather than ordinary spreadsheets. Do not email them to yourself as the only backup, and do not leave them in a shared cloud folder that family members or colleagues can open.

Maintain a short written summary at the top of each year's folder: which platforms you used, what the year's activity consisted of, which reports are present, and which items are unresolved. A reviewer who opens that summary first will understand the folder without having to reconstruct your history from raw files. Keep the summary factual and brief; it is a map, not an argument.

When you are asked to provide records, send the exports and the summary, not edited versions. If a platform's export is difficult to read, you may add a plain-language explanation alongside it, but never alter the original file. Keep a copy of exactly what you sent and the date you sent it, so there is no dispute later about which version was provided.

Revisit the folder at least twice a year. Confirm that your backups still open, that the current year's downloads have been added, and that any unresolved item has either been closed or updated with a note. A record set that is maintained in small increments is far easier to defend than one assembled the week a review begins.

Risk boundary: Nigeria Crypto Guide

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Scenario checkpoint

• Create one encrypted folder per year with a subfolder for each platform you used, and keep a backup on a separate device.
• Download transaction, trade, deposit and withdrawal histories for every year, plus futures records if you used derivatives.
• Check the help centre and fee page of each platform so you can explain why filled amounts differ from the prices you saw.
• Reconcile deposits and withdrawals against bank and wallet records, and write a short explanation for every difference.
• Keep a one-page index and summary per year listing what is present, when it was downloaded and what remains unresolved.
• Store a copy of exactly what you send to any reviewer, with the date, and never edit the original exports.