Build an evidence trail for business expenses

The useful test is evidence, not memory

A payment leaving an account does not by itself prove the correct tax treatment. Keep the document, the transaction and a short explanation of the business purpose together.

Do this now

1. Choose one capture route for receipts and supplier invoices.
2. Record the date, supplier, amount, category, payment method and business reason.
3. Mark costs that are partly personal, reimbursed, capital in nature or uncertain for later review.
4. Reconcile records to the bank or card at least monthly.
5. Keep mileage or home-working evidence as activity happens, using the current HMRC rules for the method chosen.
6. Set a retention reminder based on the official rules that apply to your structure.

What good looks like

You can move from the accounts entry to the original evidence and explain why it belongs to the business. Missing receipts and uncertain items are visible rather than silently guessed.

Common mistakes

• Assuming every cost with the word business on it is allowable.
• Claiming the full amount of mixed personal and business use without evidence.
• Keeping only a card statement where a fuller invoice is needed.
• Recording asset purchases as ordinary day-to-day costs without checking treatment.
• Letting app photos become inaccessible after changing software.

When to get professional help

Ask an accountant about vehicles, travel, meals, clothing, home use, equipment, finance costs, pre-trading costs and mixed-use items. The right treatment depends on the facts and business structure.

Keep in your roadmap

Save the bookkeeping location, review frequency, responsible person and a list of items awaiting a decision.