What triggers an HMRC property income enquiry
- Land Registry data matching: HMRC cross-references property ownership against self-assessment returns — landlords with multiple properties not on returns are flagged
- Letting agent and platform data: OECD DAC7 (from 2024) requires Airbnb, Rightmove, and letting agents to report landlord income to HMRC automatically
- HMRC Connect system: analyses social media, Companies House, credit reference agencies, and benefit records to identify declared income anomalies
- Third-party information: neighbours, former tenants, and local authorities (council tax records) can and do report landlords to HMRC
- Random compliance checks: HMRC runs random enquiry programmes — a random enquiry is not a sign a specific problem has been identified, but requires full co-operation
HMRC enquiry types — aspect, full, COP8, COP9
- Aspect enquiry: focuses on one item in the return — a rental income figure, a specific deduction, or a disposal. Quicker to resolve if evidenced properly
- Full enquiry: examines the entire return — all income, all deductions, all gains. Triggered by significant risk indicators and can last 1-3+ years
- Code of Practice 8 (COP8): civil investigation where HMRC suspects serious fraud (typically losses over £100,000 or complex offshore elements)
- Code of Practice 9 (COP9): most serious civil route — offers a Contractual Disclosure Facility (full disclosure in exchange for no criminal prosecution)
Let Property Campaign — voluntary disclosure process
- Notify HMRC of intention to disclose via Gov.uk; calculate all undeclared income, expenses, and tax for open years
- For careless under-declaration: HMRC typically accepts 4 tax years; minimum penalty 0% with full co-operation
- For deliberate under-declaration: HMRC may require up to 20 years; minimum penalty 20% unprompted
- Interest on underpaid tax runs from the original due date (31 January following the relevant tax year) at base rate plus 2.5% — not negotiable
Appoint a specialist before responding
Do not respond to HMRC directly. A tax investigation specialist manages communications, gathers evidence, and negotiates penalty rates. Fee protection insurance (often included in landlord insurance) can cover adviser costs of £5,000–£50,000+.
Prevention — staying HMRC compliant
- Register for self-assessment by 5 October following the first tax year rental income is received
- Report all rental income including cash, short-term lets, Airbnb, and rent received in kind
- Maintain records of all allowable expenses with invoices — agents, repairs, insurance, 20% mortgage interest credit (s.24)
- File by 31 January (online) or 31 October (paper); pay balancing payment by 31 January
- Annual review with a property-specialist accountant — the cost is itself an allowable expense