HMRC Compliance Checklist 2026: 5 Steps to Audit-Proof Your Accounts
Published: July 6, 2026
Think your tax returns are accurate? HMRC might spot mistakes before you do.
Around 1 in 10 tax returns are subject to HMRC scrutiny; HMRC is cross-referencing your data against bank references and third-party data before your returns are even processed.
This checklist walks you through the process of identifying gaps and fixing them, with complete control.
What This Review Actually Checks
The Five Dimensions Every Review Must Cover
A reliable accounts audit checklist works across five dimensions:
| Dimension | What It Checks |
|---|---|
| Completeness | Every income source and every expense incurred is in the accounts. |
| Accuracy | Figures match their supporting documents. |
| Cut-off | Transactions are recorded in their required periods. |
| Classification | Amounts are coded to the correct accounts. |
| Existence | Every entry represents a real transaction backed by a document you can produce on request. |
These five dimensions underpin any financial statement review checklist, whether it is prepared by an accountant at year-end or by a business owner reviewing their own records before filing.
Why the Stakes Are Higher Now
- Under the Finance Act 2021, HMRC can issue Financial Institution Notices (FINs) to banks to submit raw transaction data straight to HMRC. HMRC can cross-check your records against bank records to flag discrepancies.
- From April 2026, MTD for Income Tax (SI 2026/336) requires every transaction to be entered digitally under its specific date, amount and category. Submitting invoice and receipt totals at the end of the tax period is no longer legally compliant.
Step 1: Check Your Revenue Records
This three-step approach can act like a quick revenue audit checklist:
- Review the time and dates of all the invoices, and check 10 days before and after the issued invoices to ensure that any late March invoices are not accidentally entered in April’s records.
- If your system integrates any third-party payment platform, such as PayPal or Stripe, do not simply record the net cash received; also record the gross amount and any charges or fees.
- Ensure that invoices are entered in the correct sequence, with no unexplained gaps. Any gap might result in your income being flagged.
Step 2: Check Your Expense Records
HMRC requires limited companies and sole traders to record their expenses under the strict regulation to statutory tests, CTA 2009 s54 and ITTOIA 2005 s34 respectively:
- Every recorded expense should be wholly and exclusively for business use. Any dual-purpose item which is significantly unseparated or has a personal element will get flagged; either document the business portion clearly or remove the claim.
- Any line without a supporting document should also come out, because a bank statement entry alone is not sufficient for expenses HMRC is likely to examine. For VAT-registered businesses, confirm input VAT was claimed only on allowable expenses and excluded on non-allowable ones.
- Ensure that assets purchased above the £500 threshold are not coded as day-to-day operational expenses. Under accrual accounting, these must be capitalised on the Balance Sheet and claimed via capital allowances, such as the Annual Investment Allowance (AIA).
Step 3: Check for Patterns That Draw HMRC Attention
HMRC uses transparent benchmarking algorithms to compare your company’s figures against industry averages for your specific sector.
- Compute your gross margins and conduct a comparative analysis to the prior year, and if you notice any unusual fall by more than 5-10% without any operational reason, your file is more likely to get flagged. A margin that consistently sits below your sector average carries the same flag.
- For limited companies, confirm that no directors’ loan account entries have been recognised as expenses in the profit and loss account. Salary and dividend figures must match payroll records and any board minutes. These are among the first items HMRC’s compliance team reviews on a formal enquiry.
Step 4: Check Your Documentation Is Complete
- Verify Transaction Detail: Every transaction should be logged with the specific date, amount, category, and VAT codes, if assigned. Entering monthly totals is not legally compliant with MTD.
- Ensure transaction entries are logged individually. Summary logs or batch monthly totals do not comply with Making Tax Digital (MTD) digital record-keeping regulations. Every transaction requires a distinct date, amount, and category split.
- Secure Digital Backups: Legible digital photo captures of receipts are fully approved by HMRC. Ensure your digital storage architecture associates these clear visual files directly with the transaction row in your software.
- Enforce Retention Timelines: Store your compiled ledger and source documents safely. Sole traders must legally retain records for 5 years and 10 months following the self-assessment deadline (TMA 1970 s12B). Limited companies must hold them for a minimum of 6 years.
A Quick Accounts Audit Checklist
- Cross-check the declared numbers against your bank records and third-party platform reports.
- Review all invoices within the 10-day window, both before and after, to confirm that no previous month’s late invoice is added in this period.
- Conduct expense statement review and analyse that all the expenses match HMRC’s wholly and exclusively principle and also have supporting documents.
- Check that capital purchases over £500 are not coded as revenue expenses.
- Conduct comparative analysis of gross margins against prior year and document any significant change.
- Check that each transaction includes the date, amount, category, and VAT codes for VAT-assigned businesses.
Final Thoughts:
Most businesses skip these quick checks, as reconciliation and margin benchmarking are the first things HMRC’s system flags. Maintain your accounts properly from the start of the year and transform long year-end reclassifications into a quick accounts audit.
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