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Accounting & Bookkeeping for a Small Business

Every business needs some system for recording sales, purchases, assets, and liabilities — not just for HMRC, but to actually know whether the business is profitable and to plan cash flow and funding needs with real numbers rather than guesses.

What You Need to Track

At minimum, a workable accounting system should give you, at any point, a clear picture of: money paid to suppliers, invoices received but not yet paid, money owed to you by customers, and cash actually in the bank. This information underpins everything else — planning cash strategy, assessing whether you need additional funding, and spotting where costs could be cut.

Manual vs Software

Legally, most small businesses can keep manual records — but this is increasingly the exception rather than the rule. Making Tax Digital for VAT already requires MTD-compatible software for VAT-registered businesses, and Making Tax Digital for Income Tax is being phased in for self-employed people and landlords from April 2026. See our full Making Tax Digital guide for the current thresholds and deadlines.

Even outside MTD's mandatory scope, cloud accounting software — Xero, QuickBooks, FreeAgent, Sage — is designed for small businesses without prior bookkeeping experience, and is far less error-prone than spreadsheets once transaction volume grows. Several UK business bank accounts include free access to one of these as part of the account.

Tax Depends on Getting This Right

VAT, Corporation Tax, and Income Tax calculations are all derived directly from your accounting records — inaccurate records don't just risk an incorrect return, they risk a separate HMRC penalty for inadequate record-keeping on top of any penalty for the return itself.

How Long to Keep Records

  • Sole traders and partnerships: at least 5 years after the 31 January submission deadline of the relevant tax year
  • Limited companies: at least 6 years from the end of the last company financial year they relate to

Keep records longer than the minimum if you're under HMRC enquiry, or where they relate to an asset you still hold that may be relevant to a future tax calculation (such as Capital Gains Tax on eventual sale).

When to Bring in an Accountant

A good accounting system doesn't replace professional advice, particularly around structuring, tax planning, or anything beyond routine bookkeeping. See our guide to choosing an accountant for when and how to bring one in.

Frequently Asked Questions

Yes — every business, regardless of size, needs some way of recording sales, purchases, assets, and liabilities accurately. This isn't optional: HMRC requires accurate records to support your tax returns, and without them you can't reliably know whether you're actually making money.

Legally, yes, for most small businesses — but Making Tax Digital for VAT already requires MTD-compatible software for VAT-registered businesses, and MTD for Income Tax is being phased in for self-employed people and landlords from April 2026 onwards. Even where not mandatory, software (Xero, QuickBooks, FreeAgent, Sage) is generally far less error-prone than spreadsheets or paper once transaction volume grows.

Sole traders and partnerships must keep records for at least 5 years after the 31 January submission deadline of the relevant tax year. Limited companies must keep records for at least 6 years from the end of the last company financial year they relate to. Keep records longer if you're under HMRC enquiry or hold assets that may be relevant to future tax.

HMRC can charge penalties for inadequate record-keeping, separate from any penalty for an incorrect tax return caused by those poor records. Beyond the direct penalty risk, without accurate records you can't reliably plan cash flow, assess funding needs, or spot where costs could be cut.