How long to keep business records in the UK (and in what format)

UK record-keeping rules are short to state and long to live with: five years for the self-employed, six for companies, and a £3,000 fine plus director disqualification sitting behind the company rule. The more useful questions are the second-order ones: when do the clocks actually start, when do they run longer, and what format does HMRC accept. All of it is sourced from HMRC guidance in the Sources section.

The retention periods

Worked example for a sole trader: records behind the 2025-26 return (submission deadline 31 January 2027) must be kept until 31 January 2032 ^[1] . Filing a return more than 4 years late flips the rule: records then need keeping only 15 months after submission ^[1] .

When companies must keep records longer than 6 years

The 6-year period stretches in four situations ^[2] :

• A transaction spans more than one accounting period.
• The company bought something expected to last more than 6 years, such as equipment or machinery.
• The Company Tax Return was filed late.
• HMRC has opened a compliance check into the return.

The equipment rule is the quiet one: asset purchase invoices effectively need to outlive the asset, because they substantiate capital allowances years later.

The penalty

The fixed fine is documented ^[2] , but the expensive failure mode in practice is quieter: in an enquiry, an expense without a record behind it is just a number HMRC can refuse. Disallowed deductions plus interest plus penalty loadings routinely dwarf £3,000.

What format HMRC accepts

HMRC is format-agnostic for most records: paper, digital, or inside software all qualify, as long as the result is accurate, complete, and readable ^[3] . Two refinements matter for a modern setup:

1. MTD makes digital mandatory, not just acceptable, for VAT records and, since April 2026, for mandated sole traders’ and landlords’ income records. Cut-and-paste between systems does not count as a digital link.
2. Lost paper is a disclosure event. If records are destroyed, HMRC expects recreated copies where possible and disclosed estimates where not, with interest and penalties if estimates understate tax ^[3] .

The combination means the lowest-risk policy for a UK small business is capture-at-source: photograph or forward every receipt and invoice the day it exists, store the image against the transaction, and let the paper be irrelevant from that point on. That is precisely the workflow ExpenseFlow automates: documents are captured, extracted, coded with the right VAT treatment, and synced into Xero or QuickBooks Online with the source image attached to the transaction, building the 5-or-6-year archive as a side effect of normal bookkeeping rather than as a year-end scramble. Retention itself then rides on the accounting platform’s records, with every entry evidenced.

Which records, exactly

For the self-employed, HMRC’s list covers all records of sales and income, business expenses, VAT records if registered, PAYE records if employing, personal income, and grants received ^[1] . Companies add the structural layer: records about the company itself (registers, resolutions, share transactions) alongside accounting records covering money received and spent, assets and liabilities, stock at year end, and goods bought and sold with buyer and seller identified ^[2] . The pattern across both lists is that HMRC expects the evidence chain, not just the totals: a category sum in a return must decompose into transactions, and each transaction must produce its document. Books without source documents fail the test exactly as badly as a drawer of receipts without books.

A practical retention policy

• Capture every expense document digitally on the day it arrives; treat paper as a temporary medium.
• Keep asset purchase invoices for the life of the asset plus 6 years.
• When closing a company or ceasing trade, archive the final 6 years of records before shutting down software subscriptions.
• If HMRC opens a compliance check, freeze deletion entirely until it concludes ^[2] .