HMRC · Let Property Campaign · Disclosure guide
HMRC Let Property Campaign: how to disclose undeclared rental income.
Written by Iftikhar Rashid FCCA — Managing Partner, RR Accountants. 16 years in practice.
Have undisclosed rental income? Come forward voluntarily.
HMRC's Let Property Campaign gives landlords with undisclosed rental income the opportunity to come forward at reduced penalties before HMRC contacts them. Voluntary unprompted disclosure typically attracts penalties of 0–30% of underpaid tax. Waiting for HMRC to contact you first — which they increasingly do using Land Registry and letting agent data — means the penalty starts higher and the options are fewer.
Act now: Voluntary disclosure before HMRC contacts you always produces a better outcome than disclosure after. The sooner this is dealt with, the better.
How HMRC identifies landlords with undisclosed income
Land Registry
HMRC cross-references who owns buy-to-let properties with who is declaring rental income in self-assessment. A mismatch triggers a letter.
Letting agent reports
Letting agents must report landlord details and payments to HMRC. If your agent has reported your income and your SA return does not show it, HMRC notices.
HMO licensing
Local authority HMO licensing records identify landlords with multiple properties. Cross-referenced with HMRC data.
Bank data matching
HMRC's Connect system analyses bank transaction data for patterns consistent with rental income — regular large payments received.
Overseas property data
UK residents must declare overseas rental income. HMRC receives data from foreign jurisdictions under the Common Reporting Standard.
Tenants and previous tenants
HMRC sometimes receives tip-offs. Less common, but landlords who have had disputes with tenants are at higher risk.
Penalty comparison: voluntary vs prompted disclosure [VERIFY]
| Scenario | Typical penalty range [VERIFY] | Why |
|---|---|---|
| Voluntary unprompted disclosure (LPC) | 0–30% of underpaid tax | Highest cooperation credit. Coming forward before HMRC contacts you. |
| Prompted disclosure (HMRC contacted first) | 15–30% minimum | Reduced cooperation credit. HMRC already had you on their list. |
| Careless inaccuracy not disclosed | 30%+ | HMRC opened enquiry, found undisclosure. |
| Deliberate non-disclosure | Up to 100% of underpaid tax | HMRC found deliberate concealment. Most serious. Criminal prosecution possible. |
[VERIFY current penalty rates and ranges at gov.uk]
The LPC disclosure process
Speak to your accountant first
Before contacting HMRC, understand the full extent of the disclosure: which years, what income, what expenses, what the likely liability is. The structure and presentation of the disclosure affects the outcome.
Notify HMRC of intent to disclose
The LPC process begins with a notification to HMRC. They issue a disclosure reference number. This starts the 90-day window to calculate and pay. [VERIFY: current LPC process at gov.uk/government/publications/let-property-campaign]
Calculate the full liability
All undisclosed years. Correct rental income figures. All allowable expense deductions. Section 24 credit (for personal-name landlords post-2020). CGT if any properties were sold. Interest on underpaid tax.
Submit the disclosure and pay
The disclosure is submitted through HMRC's LPC online service within the 90-day window, along with the tax, interest, and any penalty. HMRC confirms acceptance.
Register for self-assessment going forward
Once disclosure is complete, register for self-assessment if not already done, and ensure correct returns are filed annually from that point.
Let Property Campaign — FAQs
What is the HMRC Let Property Campaign?
The Let Property Campaign (LPC) is HMRC's ongoing initiative that gives UK landlords with undisclosed rental income the opportunity to come forward voluntarily. It has been running since 2013. Landlords who disclose voluntarily under the LPC receive more favourable penalty treatment than those HMRC contacts first. HMRC uses Land Registry data, letting agent information, bank data, and local authority records to identify landlords who may not be declaring rental income.
How does HMRC find out about undisclosed rental income?
HMRC's Connect system cross-references multiple data sources: Land Registry (who owns what property), letting agent reports (agents must report landlord payments to HMRC), local authority licensing for HMOs, estate agent data on rental properties, bank account analysis, and Companies House for SPV directors. HMRC typically has more information than landlords realise. If you own a property that appears in letting agent records but not in your self-assessment, HMRC will notice.
What is the penalty for undisclosed rental income?
The penalty depends on whether the undisclosure was prompted (HMRC contacted you first) or unprompted (you came forward voluntarily), and whether it was a result of a mistake, negligence, or deliberate concealment. Unprompted voluntary disclosure typically attracts penalties of 0–30% of the underpaid tax (depending on the type of error). HMRC contacting you first before you disclose typically means 15–30% minimum, higher for deliberate concealment. Interest also accrues on underpaid tax from the original due date. [VERIFY current penalty rates at gov.uk]
How far back can HMRC investigate undisclosed rental income?
For innocent mistakes: typically 4 years from the end of the tax year. For careless errors: 6 years. For deliberate non-disclosure: up to 20 years. Most voluntary LPC disclosures cover the period HMRC is likely to investigate based on the circumstances — usually 4–6 years. Your accountant will advise on the appropriate disclosure period. [VERIFY current enquiry time limits at gov.uk]
What should I do if I have undisclosed rental income?
Three steps: (1) Do not wait for HMRC to contact you — voluntary unprompted disclosure attracts the lowest penalties. (2) Calculate the rental income and expenses for all undisclosed years accurately — this is not a moment for estimates. (3) Contact an accountant experienced in voluntary disclosures before contacting HMRC — the way a disclosure is structured and presented affects the penalty outcome.
Can I do the Let Property Campaign disclosure myself?
Technically yes — HMRC's LPC online service allows self-disclosure. But the penalty calculation, the years included, the expense claims, and the disclosure narrative all affect the outcome significantly. A poorly presented self-disclosure can result in higher penalties than a professionally handled one. Given the sums typically involved (multiple years of undisclosed income plus interest plus penalties), professional help pays for itself.
Act now — before HMRC contacts you
Let's assess your position today.
Book a call. We'll review the disclosure requirements, calculate the likely liability, and handle the entire LPC process professionally. Voluntary disclosure is always better than HMRC finding you first.
Book a call today →Iftikhar Rashid FCCA · 16 years · Specialist in property and landlord tax