Late March can feel like the final lap: you’ve imported your crypto activity into tax software or a spreadsheet, the totals are sitting there… and you’re wondering whether they’re actually right.
This crypto tax sanity check is meant to reduce that “I hope this is fine” feeling. It’s a calm, practical workflow to help you spot common data issues—missing accounts, duplicate imports, transfer mix-ups, and gaps in cost basis—before you file. It’s organizational guidance, not tax advice, and it doesn’t require any specific tools.
The 8 checks that catch most common crypto reporting mistakes
Check 1: Confirm you included every account. Start with a simple inventory: every exchange, wallet app, hardware wallet, custody platform, and any “earn” or rewards account you used. If you ever moved coins through it, it belongs on the list—even if it’s empty now.
Check 2: Do a high-level balance reasonableness check. Compare your year-start and year-end holdings (or a close approximation) to your own reality: screenshots, statements, or wallet histories. The goal isn’t perfection—it’s catching the obvious “How do I have negative ETH?” moments.
Check 3: Make sure transfers are identified as transfers. Moving crypto between your own wallets/accounts can get imported as a “send” on one side and a “receive” on the other. If those are accidentally treated as sales or income events, your totals can balloon. Mark what you can confidently match as internal transfers and flag the rest for review.
Check 4: Look for duplicates from multiple imports. Duplicates often happen when you connect an API and also upload a CSV, or when you re-import after editing. Sort by date/time and amount, then scan for pairs that look identical. If you delete anything, keep notes on what you removed and why.
How to spot missing exchanges, duplicated transactions, and transfer mix-ups
Check 5: Scan fees, timestamps, and time zones for anomalies. Fees can be imported inconsistently (separate line items, included in totals, or missing). Time zone differences can also create “out of order” trades or make two records look different when they’re the same event. If your software/spreadsheet lets you standardize time zones, use one consistently and re-check duplicates afterward.
Check 6: Confirm “earned” crypto categories are present. Many people have digital assets from sources beyond buying and selling: staking rewards, referral bonuses, airdrops, learn-and-earn programs, or interest-like rewards. Whether and how these are reported can be nuanced, so the sanity check here is simply: do you see these inflows anywhere in your records, or did the import miss them?
Check 7: Flag missing cost basis entries (don’t guess). “Missing cost basis crypto” problems are common when deposits arrive from another wallet, an exchange closes, or older history can’t be pulled. Instead of filling blanks with assumptions, create a questions list for a tax pro (or for your own follow-up). Helpful notes include where the asset came from, approximate date range, and any documentation you can find.
- Is this deposit from my own wallet (transfer) or from someone else?
- Do I have a confirmation email, statement, or on-chain transaction ID?
- Is the missing data limited to one platform or one date range?
What to save for your records (and how to protect your data)
Check 8: Export and store a “record pack” securely. Before you file, save a clean snapshot of what you’re relying on. Think of it as your crypto tax records checklist for future-you, in case a platform changes, an API breaks, or you need to explain a reconciliation months later.
- Your final transaction export(s) and/or consolidated spreadsheet used for totals
- Any exchange account statements available for the year
- Notes on reconciliations (especially transfers matched, duplicates removed, and any assumptions avoided)
- A list of accounts/wallets included and excluded (with reasons)
Privacy-first storage tips: Treat these files like you’d treat sensitive tax documents. Use strong, unique passwords and turn on multi-factor authentication where possible. If you store files digitally, prefer encrypted storage and limit sharing. Be cautious with forwarding CSVs over email, and watch for phishing around “tax deadline” messaging.
If totals still won’t reconcile: Pause and narrow the problem. Pick one asset (like BTC) and one month, then reconcile transfers and duplicates there first. If you still can’t explain gaps, that’s a good sign to consult a qualified tax professional—bring your questions list and your record pack so you’re not starting from scratch.
This article is for general educational organization and recordkeeping ideas, not tax, legal, or financial advice.
Sources
Recommended sources to consult for verification of IRS terminology, general digital asset recordkeeping expectations, and privacy/safe-handling guidance. (This article does not cite or rely on any single page; confirm details against the official references below.)
- Internal Revenue Service (irs.gov) — digital assets/virtual currency guidance and general recordkeeping expectations
- Taxpayer Advocate Service (taxpayeradvocate.irs.gov) — plain-language taxpayer guidance and issue explanations
- American Institute of CPAs (aicpa.org) — professional context on tax documentation and record retention considerations
- SEC Investor.gov (investor.gov) — investor education on digital assets and risk awareness
- Federal Trade Commission (ftc.gov) — protecting personal information and avoiding tax-season scams
Verification notes: Confirm current IRS phrasing (e.g., “digital assets”) and any instructions relevant to reporting and recordkeeping. Keep privacy steps aligned with FTC recommendations and avoid storing sensitive exports in unsecured locations.