How to Fix Common CSV Errors from Crypto Exchanges

Common CSV Errors and How to Fix Them

Crypto exchanges often export CSV files with errors that prevent import into tax software. Here's how to identify and fix them.

Problem: Some rows have blank date fields

Date,Amount,Type
2025-01-01,0.5,Buy
,1.2,Sell  ← Missing date

Solution: TaxFormatter automatically detects missing dates and either fills them from context or flags them for review.

Problem: Mixed date formats in the same file

01/15/2025  ← MM/DD/YYYY
2025-01-16  ← ISO format
15-Jan-25   ← Custom format

Solution: Our AI engine recognizes 20+ date formats and standardizes them automatically.

Problem: Exchange doesn't specify buy/sell/trade

Date,Amount,Currency
2025-01-01,0.5,BTC
2025-01-02,-0.3,BTC  ← Is this a sell or transfer?

Solution: We infer transaction types from amount signs and historical patterns.

Problem: Same transaction appears multiple times

This happens when:

Solution: TaxFormatter detects duplicates by matching timestamp, amount, and currency within a 1-second window.

Problem: Non-ASCII characters in column names

Dáte,Ámount,Çurrency  ← Non-standard characters

Solution: We normalize all headers to ASCII equivalents.

Problem: CSVs contain internal exchange IDs, metadata, or notes

Date,Amount,InternalID,Notes,Status,ProcessingFee

Solution: Our parser extracts only the columns needed for tax reporting and discards the rest.

Problem: European vs US decimal formats

1.234,56  ← European (comma as decimal)
1,234.56  ← US (comma as thousands)

Solution: Context-aware detection determines which format is being used.

Problem: CSV doesn't specify which exchange it's from

Tax software needs to know the source exchange for accurate reporting.

Solution: TaxFormatter's AI fingerprints the CSV structure to identify the source exchange automatically.

✅ Download directly from exchange - Don't edit in Excel first

✅ Include all transactions - Even failed or cancelled ones

✅ Keep original files - Save a backup before processing

✅ Verify totals - Check that transaction counts match

Contact support if you have:

Upload your CSV to TaxFormatter and get a free audit showing exactly what errors we found and how we'll fix them.

No credit card required. No risk.

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