Making Tax Digital · Sole traders
Mixing personal and business money: how to keep reliable tax records
ONLY£15A MONTHUsing one account for household spending and business payments does not make accurate tax records impossible.
Using one account for household spending and business payments does not make accurate tax records impossible. It does make the review harder. The aim is to distinguish business activity from personal money clearly, whether you open a separate account or improve an existing mixed-account routine.
A separate account is a practical choice
A sole trader is not a separate limited company, and there is no general rule requiring every sole trader to buy a particular business bank account. However, your bank's terms may restrict business use of a personal account. Read the terms for your actual account.
A dedicated account helps because fewer transactions need explaining. It does not make everything paid from that account deductible. Private shopping, drawings, personal tax payments and transfers to savings still need the correct treatment.
Sort money by what it represents
| Transaction | Usual bookkeeping question |
|---|---|
| Customer payment | Which trade earned it? |
| Transfer from personal savings | Is this capital introduced rather than income? |
| Supermarket payment | Business supplies, household shopping or a mixture? |
| Transfer between your accounts | Has it already been recorded elsewhere? |
Avona AI can help organise a feed, but ambiguous transactions need your context. A merchant label cannot reliably separate a client's refreshments from the family's weekly shop.
Worked example: the misleading bank surplus
Lee receives £3,000 from customers and transfers £1,000 of savings into the account. Outgoings include £800 of business supplies and £600 of personal spending. The simple cash movement is £2,600, but the simplified business profit is £3,000 − £800 = £2,200.
The savings transfer does not increase trading income, and the personal spending does not reduce trading profit. Keeping all four amounts visible explains why the bank movement and profit differ.
Reconcile receipts, not just bank payouts
A bank deposit is not always the original sale. A platform, card processor or agent may deduct fees before sending you the balance. Keep the statement showing the gross amount, deductions, refunds and final payout, then explain the difference in your records.
Cash needs the same attention. Record customer cash when received under the cash basis, even if some of it is spent before the rest reaches the bank. Banking cash already recorded as a sale is a transfer between your cash and bank records, not another sale.
HMRC's record-keeping guidance covers income and business expenses. The useful practical test is whether another person could follow a payment from the original sale to the amount received without counting it twice.
Do not use bank feeds as a reason to ignore payment accounts, credit cards, cash or payments made personally for the business. List every place where business money passes, choose the source for each type of transaction and review transfers between those sources. This turns reconciliation into a repeatable check rather than a search through several unrelated statements.
Start with the business purpose
An expense category describes a cost; it does not decide whether the cost qualifies for relief. The starting point is whether the spending was for the trade. Where an identifiable part was private, keep that part out of the claim. A personal withdrawal is not an expense simply because it leaves the business bank account.
HMRC's self-employed expenses guide explains the distinction between running costs, capital expenditure and private use. For example, a supplier may sell both equipment and household products. The shop's name is useful evidence, but the invoice tells you what you bought.
Record the full transaction and the business calculation clearly. If a £120 bill has £30 of identifiable private spending, a £90 business claim is easier to explain when both amounts and the reason for the split are retained. Do not delete the private part merely to force the bookkeeping total to resemble the tax deduction.
Nor is a deduction a reimbursement. Spending £100 to save a fraction of that amount in tax still leaves you with a real cost. Buy what the business needs, keep appropriate evidence and claim the relief available under the correct rules.
Where this fits into Making Tax Digital
For 2026/27, the first mandatory phase generally covers individuals whose combined qualifying self-employment and property income was more than £50,000 in 2024/25, subject to exemptions. Qualifying income normally means income before expenses. It is a different figure from taxable profit. Check the qualifying-income rules.
Once within MTD, keep the required digital records and send quarterly summaries for each relevant business. The summaries are cumulative from the start of the reporting year. They do not contain your entire personal tax position, and sending one does not itself create a quarterly tax-payment demand.
HMRC does not require accounting or tax adjustments before each quarterly update. Those adjustments and the other information needed for the annual return still have to be completed at the appropriate stage. Keep a review list so a matter deferred until year end is not forgotten. Read HMRC's quarterly-update guidance.
Software can organise the information, but the business facts remain essential. Review the figures you approve rather than assuming that a successful import has also settled every tax question.
A routine for mixed accounts
Mark personal transactions as you review the feed, retain the reason for mixed-use splits and check transfers in pairs. If you move to a separate account, record the changeover date and continue reviewing the earlier account until all business payments have moved.
Take the next step
Avona.app offers a self-service route from £15/month. Bring your records together, review the figures and choose a workflow that fits your business. For professional help, discuss the scope and total price of Avona Concierge, managed by chartered accountants, before choosing a service.