Making Tax Digital · Sole traders
Setting up bank categorisation rules for the second MTD update
ONLY£15A MONTHRules can reduce repetitive bookkeeping when they reflect a transaction pattern you have already checked.
Rules can reduce repetitive bookkeeping when they reflect a transaction pattern you have already checked. They should make recurring decisions easier to apply, while leaving exceptions visible. A familiar merchant name is not enough to justify categorising every future payment identically.
Start with a narrow, tested pattern
Choose recurring items with a consistent purpose, such as a dedicated business subscription. Check the date, amount, reference and supporting invoice across several occurrences. Review refunds or price changes before deciding which conditions the rule should use.
Avoid broad rules for mixed retailers, personal accounts or transfers between businesses. A supplier selling both household goods and business equipment needs invoice-level review. An automatic category should not be treated as a tax ruling.
Test the effect on historical records
Use the current software's supported rule controls. Confirm whether the rule applies only to future transactions or also changes existing entries. Inspect the result before approving a bulk change and retain an explanation for corrections.
For standard periods, the second three-month segment runs from 6 July to 5 October 2026, but the second update is cumulative from 6 April. Earlier corrections can therefore affect the second update's totals.
Worked example: a dedicated software payment
A £24 monthly subscription is used solely for the business and appears under a stable reference. After checking the invoices, the user creates a suitable rule and reviews the next occurrence.
A separate purchase from a general online retailer receives no blanket rule because the orders include private items. The difference is the reliability of the pattern, not the popularity of the merchant.
A review that checks more than the total
Start with coverage: the correct person, business and period, plus all relevant accounts and cash records. Then look at completeness. A feed can be connected today while still missing an earlier week. Confirm the earliest and latest transactions against the source.
Next, inspect unusual items. Large transfers, loan receipts, refunds, net settlements and private purchases often need more context than a bank description provides. Check for duplicate imports where a statement overlaps a live feed. An automatic warning is useful evidence to investigate, not proof that the entry must be removed.
Finally, review category totals. A category unexpectedly showing zero, a large increase or a negative amount deserves an explanation. You do not have to make every annual tax adjustment at this stage, but you should understand the records behind the summary you approve.
HMRC explains what quarterly updates contain. Keep the approved version and the resulting acknowledgement together. If something later changes, correct the source record and use the software's supported update process so you can explain which figures are current.
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.
Review rules when the business changes
Check new suppliers, changed references and unusual amounts. Remove rules that no longer describe the transactions and inspect exceptions before filing. Automation is most useful when it reduces repeated work without hiding the facts that need judgement.
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.