Catch-up bookkeeping guide

Step 1: Find where your records stopped

• Open your software and find the last month where every bank and card account is reconciled.
• List every account the business uses: bank, credit card, PayPal, Stripe, loans and any cash.
• Note which months are missing for each account.

Step 2: Deal with deadlines first

Overdue returns cost money every month they stay late. Check these before anything else:

• Self Assessment: £100 penalty straight away if the return is late. After 3 months, £10 a day up to £900. After 6 months, a further 5% of the tax due or £300, whichever is greater, and the same again after 12 months.
• VAT returns: late returns and late payments have their own penalty points and interest.
• Payroll: submissions are due on or before each pay day.
• MTD quarterly updates, if you are in MTD for Income Tax: due 7 August, 7 November, 7 February and 7 May. Late updates don't earn penalty points in 2026 to 2027, but they do from 2027 to 2028.

If a return is already late, file it as soon as you can, even if you need to correct it later. Penalties keep growing until it is in.

Step 3: Gather the evidence

• Download bank and card statements for every missing month. Most banks let you export CSV files going back several years.
• Search your email for receipts and invoices: "receipt", "invoice", "order confirmation".
• Ask regular suppliers for statements; most can send one for the year.
• Collect sales invoices, payment platform reports and any cash records.
• Use a secure upload route for statements and ID documents, not ordinary email.

Step 4: Work forward a month at a time

1. Import the statement for the month.
2. Categorise every transaction and match receipts.
3. Reconcile the closing balance to the statement.
4. List anything you can't explain as an open item.
5. Move to the next month only when this one balances.

Working in date order means each month's opening balance is already correct, so errors don't carry forward.

Step 5: Handle what's missing honestly

Some receipts won't turn up. Record what you know from the bank statement, mark the item as unsupported, and ask your accountant how to treat it. Don't invent figures to make the numbers look complete. Unsupported guesses are what cause problems if HMRC asks questions later.

Remember the record-keeping rule: sole traders must keep records for at least 5 years after the 31 January deadline for each tax year.

Step 6: Set the finish line

Agree the last month the catch-up covers and start regular monthly bookkeeping from the next one. Keep the catch-up and the ongoing work separate, so you can see when the catch-up is finished. Our monthly bookkeeping checklist sets out the routine that keeps you from falling behind again.

How long does catch-up take?

It depends on the number of transactions and the state of the evidence, not just the number of months. Six months of a sole trader's records with a single bank account can take a day. Two years across several accounts with missing receipts can take several weeks. A short review of the records first gives you a realistic estimate before you commit.

Frequently asked questions

Behind and not sure where to start? Larissa begins with a short review of your records, then gives you a fixed catch-up scope.