Last updated on 5 October 2026
If you typed “missing transaction history exchange closed” into Google, you have probably hit a dead end already. Maybe the login page no longer loads. Maybe administrators froze accounts before you downloaded anything.
A closed exchange does not cancel your tax bill. HMRC still expects accurate gains, even after a platform vanishes. The good news is that you can rebuild most records from sources you already have.
Need your records rebuilt fast? Our team reconstructs missing exchange histories and files the numbers for you. Book a FREE 30-minute consultation.
Malik Ali FCCA, who leads Crypto Accountants, sees this problem constantly. In his experience, the data rarely disappears completely. It simply scatters across your inbox, your bank, and the blockchain.
Why Missing Records Cause Real Tax Problems
UK capital gains tax depends on what you paid for every coin you hold. HMRC’s pooling rules average your costs across each token. Same-day and 30-day matching rules apply before the pool.
One missing purchase distorts every later disposal of that token. Without proof of cost, you risk paying tax on the full sale proceeds. That can turn a small gain into a large, unfair bill.
Gaps also make your figures hard to defend. If HMRC opens a check, it will ask how you reached each number. From 2026, CARF data from other platforms gives HMRC plenty to compare against.
So fixing a missing transaction history exchange closed problem protects you twice. It cuts your tax, and it strengthens your position in any enquiry.
Missing Transaction History Exchange Closed: Where to Start
First, list every exchange you used and roughly when you used it. Then work through the sources below in order. Each one fills a different gap.
Search Your Email Inbox
Most exchanges emailed you after deposits, withdrawals, and trades. Search your inbox for the exchange’s name plus words like “confirmation” or “receipt”. Check spam and archived folders too. From each email, note the date, token, amount, and price.
Check Your Bank and Card Statements
Your bank shows every pound you sent to an exchange and every pound you took out. These payments anchor your cost figures. They also prove when you entered and left the market. Download statements for the whole period, not just the years you think matter.
Trace Transfers on the Blockchain
Public blockchains keep a permanent record of every transfer. If you moved coins between the exchange and your own wallet, a block explorer shows it. Etherscan, for example, lists every Ethereum transaction for an address. You cannot see trades inside the exchange this way. You can still confirm exactly what went in and what came out.
Use the Administrator’s Claims Portal
When an exchange collapses, insolvency practitioners usually take control. They often run a claims portal showing each customer’s balance. FTX, Celsius and Cryptopia all took this approach. Your claim statement can show your holdings on the closure date. That figure helps you check your closing balances.
Send a Data Subject Access Request
UK GDPR gives you the right to ask for your personal data. That right can cover your transaction records. Send a data subject access request to the exchange or its administrator. Name the email address you used on the account. Organisations normally must reply within one month.
Check Old Tax Software Accounts
Did you ever connect the exchange to Koinly or similar software? Log back in before you assume the data has gone. Many tools keep imported transactions long after an exchange shuts.
Turning Scraps Into a CSV Your Software Accepts
Once you gather the pieces, you need them in one format. Most crypto tax software accepts a generic CSV template. Each row needs a date, type, token, quantity, and value in pounds. Give fees their own column, because fees reduce your gains.
Fill rows from your emails first, since they show actual prices. Then add bank payments and blockchain transfers to close the gaps. Where you lack a price, take one from a reputable historical price source. Record which source you used, and apply it consistently.
Imports fail more often than people expect. Date formats, duplicate transfers, and missing opening balances cause most errors. At this stage, many people start searching for CSV import crypto tax help UK.
What If You Cannot Find Everything?
Sometimes no source survives, and a missing transaction history because an exchange closed has no clean fix. The exchange shut years ago, the emails went to an old address, and the bank account closed too. You still need to file, and HMRC still expects your best effort.
In that case, build a reasonable estimate and document every step. Show which figures come from evidence and which come from assumptions. Explain your method in the additional information box on your Self Assessment return. HMRC generally views a clear, honest estimate far more kindly than silence.
A collapse may also leave you with assets you cannot recover. If so, you may have a loss to claim. A negligible value claim can let you use that loss against other gains. The rules hinge on whether the asset itself has become worthless, so take advice first.
Why It Pays to Hire a Crypto Tax Accountant?
Rebuilding a closed exchange’s history takes patience and endless cross-checking. Most people spend weeks on it and still end up with gaps. Our team handles missing transaction history for exchange-closed cases daily through our crypto reconciliation service.
We gather your emails, statements, and on-chain data, and we rebuild a clean ledger, match it to your wallets, and prepare a CSV your software accepts. Then we calculate your gains under HMRC’s rules and file your return.
Malik Ali FCCA reviews every reconstruction before it reaches HMRC. That review gives you a defensible position if HMRC ever asks questions.
If you face a missing transaction history because the exchange closed, start now. Every month you wait, inboxes purge old emails and administrators close their portals.
Book your reconciliation call. Tell us which exchange closed and what records you still have. We will tell you what we can recover and what it will cost.
People Also Ask
How do I get transaction history from an exchange that shut down?
Start with the exchange’s administrator, who may run a claims portal or answer a data subject access request. Next, search your email for trade confirmations and download your bank statements. Blockchain explorers then confirm your transfers in and out. Finally, combine everything into one CSV for your tax software.
