Logo

Why a shoebox of receipts costs you more than you think

Every January, thousands of self-employed people in the UK sit down to file their Self Assessment return and discover the same problem: they cannot remember what half of their spending was for. A faded receipt with no context, a bank statement line that says "CARD PAYMENT" and nothing else, and a growing sense that you have probably missed a few perfectly legitimate expenses.

The good news is that this is entirely preventable, and it does not require expensive software or an accountant on retainer. What it requires is a small, boring habit repeated monthly. Fifteen minutes a month will save you several stressful evenings come January.

What you actually need to keep

HMRC expects you to keep records that back up what you put on your return. For most sole traders and people with property or dividend income, that means:

• Sales records: invoices you have issued, till receipts, paying-in slips, and summaries of takings.
• Purchase records: receipts and invoices for anything bought for the business, including stock, equipment, and stationery.
• Bank and credit card statements: business accounts and any personal account used for business spending.
• Mileage and travel: a simple log of journeys if you claim simplified expenses, or receipts for train and taxi fares.
• Other paperwork: interest statements, dividend vouchers, pension contributions, and Gift Aid donations you want relief on.

Digital copies are fine. A photograph of a receipt, saved with the date and amount in the filename, is as good as the paper original for most purposes. What matters is that you can show what the expense was, when it happened, and that it related to your work.

Set aside one evening a month

Pick a date that suits you — the first Saturday, the last Friday, the day your statement arrives — and treat it as a fixed appointment. On that day, work through a short routine:

• Download or photograph the month's statements from every account you use.
• Sort receipts into two piles: business and personal. Anything ambiguous, write a note on the back straight away.
• Enter the business items into whatever system you use, whether that is a spreadsheet, an accounting app, or a paper ledger.
• File the receipts under the month, either in a labelled envelope or a dated folder on your computer or cloud storage.
• Check that your income figures match what actually landed in your bank account.

Do this every month and January becomes a case of checking and submitting, rather than reconstructing an entire year from memory.

Keep your filing system almost boringly simple

The best system is the one you will actually use. A naming convention such as 2025-04 — Stationery — 24.99 takes seconds and makes searching effortless later. Create one folder per tax year, with twelve subfolders for the months from April to March, and drop everything in as it arrives.

If you prefer paper, a single expanding file with a pocket per month is more than enough. Avoid the temptation to build an elaborate category system; you will spend more time maintaining it than using it. As long as you can find a receipt within a minute or two, your system is working.

Separate business and personal spending where you can. A dedicated business bank account, even a basic one, makes the monthly reconciliation far quicker and leaves a clean trail if HMRC ever asks questions.

Don't forget the dates that matter

Self Assessment runs on a tax year from 6 April to 5 April. If you file online, the deadline is 31 January following the end of the tax year, and any tax owed is due on the same day. If you make payments on account, the second instalment falls on 31 July. If you are newly self-employed, you generally need to tell HMRC by 5 October after the end of your first trading tax year.

You normally need to keep your records for at least five years after the 31 January filing deadline for that tax year. For the 2024/25 return, that means keeping everything until at least 31 January 2031. It sounds like a long time, but digital storage makes it painless — just do not delete folders when you tidy up your computer.

Make it easier on yourself next year

A few small habits pay off enormously. Photograph receipts as you get them, before they end up in a coat pocket. Note the business purpose on any expense that is not obvious. Reconcile your bank statements monthly rather than annually. And if you are ever unsure whether something is allowable, keep the record anyway and ask — it is far easier to remove an expense than to prove one you never recorded.

Finally, be kind to yourself. Nobody enjoys bookkeeping, and almost everyone lets it slide occasionally. The aim is not perfection; it is having enough of a trail that filing your return takes an afternoon rather than a fortnight. Start with this month, and next January will feel noticeably lighter.