What receipts you need to keep as a sole trader
As a sole trader, you must keep receipts or valid proof of purchase for every expense you claim against your business income. This includes physical shop receipts, digital invoices, utility bills, trade supplier slips, and travel receipts incurred for work. Retaining these records ensures you can substantiate your expense claims if tax authorities review your self-assessment return.
Expense categories requiring proof of purchase
Every item claimed as an allowable business deduction requires documentary evidence. For day-to-day operational costs, you need itemised till receipts or tax invoices from suppliers. This covers raw materials, stock purchased for resale, tools, safety equipment, stationery, and office consumables. A simple card machine slip showing a total figure is usually insufficient on its own because it does not list the specific items purchased.
Professional fees and services also require clear documentation. You must retain invoices for accountancy fees, legal services directly tied to business operations, trade association memberships, professional indemnity insurance, and software subscriptions. For recurring digital payments, downloadable PDF invoices or emailed receipts showing vendor details, billing dates, and item descriptions must be kept.
When purchasing capital items such as computers, machinery, office furniture, or vehicles, keep the original invoice or purchase agreement. Capital assets are treated differently for tax purposes than routine expenses, so having clear proof of purchase dates and specifications helps categorise these items accurately when calculating capital allowances.
Travel, vehicle, and accommodation documentation
Travel expenses require precise record-keeping to prove that the expenditure was incurred wholly and exclusively for business purposes. If you use public transport for work trips, keep train tickets, bus fares, flight confirmations, and taxi receipts. For overnight stays required by work, retain itemised hotel bills detailing accommodation and meal costs.
Vehicle expenses depend on whether you claim actual running costs or simplified mileage allowances. If you claim actual expenses, you must retain all fuel receipts, servicing and repair invoices, vehicle insurance schedules, and breakdown cover documents. Fuel receipts are particularly scrutinised during tax checks because garages sell personal items alongside fuel. An itemised receipt proves that the purchase was solely for fuel or oil.
If you claim simplified mileage rates instead of actual costs, you do not need to keep every fuel receipt to calculate the mileage deduction itself. However, keeping fuel receipts remains good practice to demonstrate that fuel was actually purchased during periods of business travel. In both cases, you must maintain a detailed mileage log recording the date, start and end locations, purpose of the trip, and exact distance covered.
Home office and utility records
Sole traders who work from home can claim a proportion of running costs, such as electricity, heating, internet, and council tax, or use flat-rate simplified expenses. If you calculate actual proportional costs, you must retain full copies of utility bills, broadband invoices, and landline bills covering the entire tax year.
To justify claiming a proportion of household bills, your records must demonstrate a reasonable and consistent method of calculation. This usually involves measuring the number of rooms used for business and the proportion of time spent working in those areas. Retaining the underlying utility bills establishes the actual expenditure figure to which your proportion calculation is applied.
Itemised receipts versus bank statements
A common mistake is relying solely on personal or business bank statements as proof of expenditure. While bank statements show that a transaction took place, they rarely explain what was bought. Tax authorities routinely disallow expenses supported only by bank statement entries if those entries lack detailed product breakdowns.
An acceptable receipt or tax invoice must show the name and address of the vendor, the date of transaction, a description of the goods or services supplied, and the total amount paid. If the vendor is registered for value added tax, the document should also state their tax identification number and the breakdown of tax applied to the purchase.
Capturing these documents as soon as you receive them prevents missing records at year-end. Forwarding digital invoices or capturing physical paper receipts via messaging platforms simplifies document management. For example, sending a digital invoice or receipt image to Docket reads the details and files the document into your own Google Drive within month folders based on the date printed on the document.
Sales income records and credit notes
Keeping records as a sole trader involves documenting money coming into the business as well as expenditure. You must retain copies of every sales invoice, fee note, or written estimate issued to clients. If you operate a cash business or retail trade, daily till rolls, cash book entries, or point-of-sale summary reports must be kept.
When issuing refunds or adjustments, retain copy credit notes and proof of payment returned to customers. Financial records must balance, meaning that every income entry on your bank statement or cash ledger corresponds to a matching sales invoice, receipt, or remittance advice slip.
Record retention periods and safe storage
Sole traders must keep business records for at least five years after the 31 January submission deadline for the relevant tax year. For example, records for a tax return submitted for a tax year ending in April must be retained for five full years following the corresponding January filing date. If a tax return is submitted late or is subject to a compliance check, records must be kept longer until inquiries are formally closed.
- Store physical receipts in dry, dark storage to prevent thermal till paper from fading over time.
- Maintain digital copies of paper receipts and electronic invoices in accessible cloud storage organised by date.
- Ensure backup copies exist for all electronic invoices, digital bank statements, and tax files.
Digital copies of receipts and invoices are legally acceptable proof provided they are legible and present an accurate representation of the original document. Organising files chronologically by invoice or transaction date rather than upload date makes compiling year-end accounts far simpler and ensures compliance during any official record review.