A workable record-keeping routine connects each business transaction to a useful explanation and its supporting document. For a sole trader, that means keeping more than a running bank balance. Capture the evidence as you work, then spend a regular short session matching it to the money.
The useful bits
- Keep records of business income and expenses, plus supporting evidence.
- Make business transactions identifiable, including when personal money is involved.
- HMRC’s normal retention period runs from the tax-return deadline, not the purchase date.
Build a small, repeatable filing system
HMRC requires self-employed business records covering sales and income, business expenses and personal income. VAT and PAYE records are also relevant when those rules apply. Keep evidence such as invoices, receipts and bank statements, not just totals.
Create clear places for sales, purchases and bank or payment-provider statements. A consistent month and reference in the filename is usually more useful than a complicated folder tree. The aim is to find the evidence behind a transaction without searching several inboxes.
Capture the context while you remember it
Save a receipt when you buy materials and note which job it relates to. If a document is hard to read, ask for a clearer copy while you are still dealing with the supplier. A bank entry may identify the shop without explaining what you bought.
For a customer payment, record the related invoice reference and whether it covers the whole balance or part of it. Keep refunds and corrections visible. Avoid deleting the original record just because a later adjustment changes the total.
A useful purchase note
“Replacement tap cartridge, job J-018, bought 12 October” gives a receipt context that “hardware shop” does not. This is an organisational example, not a conclusion that the cost is tax deductible.
Match documents to money once a week
Work through the week’s transactions and attach or reference the supporting document. Put anything unclear on a short questions list instead of guessing a category simply to finish. Separate transfers between your own accounts from customer receipts so you do not count the same money twice.
- Match customer receipts to invoices and note any remaining balance.
- Match purchases to receipts or supplier invoices.
- Explain personal contributions, withdrawals and transfers.
- Check processor fees and payouts separately from gross customer payments.
- List missing documents and the person you need to ask.
Keep records for the right period
HMRC normally requires self-employed records to be kept for at least five years after the 31 January submission deadline for the relevant tax year. Different rules apply to very late returns, and limited-company record keeping is a separate subject.
Set a review date before deleting anything and check the official guidance for your circumstances. Keep a backup you can actually open, and make sure leaving an app or changing accountants will not remove your only copy of important evidence.
Finish with a short handover list
At month end, send your accountant or bookkeeper the missing-items list alongside the records they requested. Include uncertain purchases and unusual transactions. They can explain the treatment; a folder full of unexplained screenshots cannot.
This routine organises evidence. It does not calculate your tax or decide every reporting requirement. Agree the format, accounting method and any digital-record obligations with the person handling your accounts.
Sources and further reading
Sources checked 28 September 2026. Follow the official guidance for the current rules and how they apply to your business.
