FIFO crypto tax preview

If you bought the same coin more than once, you may have several chunks of that coin at different prices. FIFO starts with the oldest chunk when a later SELL row needs to be matched to a BUY row.

For example, if you bought 1 ETH in January and another 1 ETH in March, then sold 1 ETH in June, a FIFO preview matches the June sale to the January buy first.

Imagine you bought 1 coin for 100, later bought 1 coin for 200, and then sold 1 coin for 150. FIFO matches the sale to the first 100 coin, so the estimated gain is based on 150 minus 100 before fees and other rule details.

If a different method matched the sale to the 200 coin, the preview would look different. That is why lot matching can change estimated gain/loss numbers even when the visible trade history is the same.

FIFO depends on order and completeness. Missing timestamps, missing buys, duplicate rows, wrong quantities, or skipped transfers can all distort the preview.

CoinTaxDelta sorts uploaded transactions chronologically, then builds read-only lot matches for supported BUY and SELL rows. If a SELL exceeds available BUY lots, the app warns that unmatched quantity was excluded from estimated gain/loss.

CoinTaxDelta can show which buy rows were matched to sell rows, holding days, estimated cost basis, estimated proceeds, and estimated realized gain/loss for supported rows.

It processes CSV files in your browser and can export review files so you can inspect results outside the app or share them with an accountant.

The app cannot decide which tax method is legally correct for you, cannot file taxes, cannot reconcile every exchange or wallet movement, and cannot replace country-specific professional advice.

Treat FIFO output as an estimate for review. If your country requires a different method, special holding-period treatment, FX conversion, or more complete records, confirm the final approach with a qualified tax professional.