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My exchange closed — I have incomplete records

The situation

Jordan used an exchange that shut down. They have some CSV exports but not all years.

An illustrative example with an invented name, not a real case.

Quick answer

Reconstruct records from bank statements, emails and blockchain explorers where possible. HMRC expects reasonable efforts. Undeclared tax may be corrected through voluntary disclosure.

What to do

  1. Export any remaining exchange data
  2. Match bank transfers to buys and sells
  3. Use block explorer for wallet history
  4. Document gaps honestly if filing or disclosing

Not financial or tax advice. Updated June 2026.