The UK tax authority, HM Revenue & Customs (HMRC), has stepped up compliance activity with landlords through its Let Property Campaign, inviting those with undeclared or under‑declared rental income to come forward and regularise their tax affairs. This long‑running initiative targets individual landlords of residential property and offers a structured way to disclose unpaid tax, potentially reducing penalties compared with facing an HMRC investigation.

What Is the Let Property Campaign?

The Let Property Campaign is an ongoing HMRC disclosure opportunity for landlords who have previously failed to declare all rental income on their tax returns. It applies to individuals letting residential properties, including single‑property landlords, those with multiple lets, landlords of holiday homes, and landlords renting rooms above the Rent a Room Scheme threshold. The campaign also includes UK residents letting properties abroad and non‑resident landlords with UK taxation obligations. It does not generally apply to companies, trusts or commercial property letting.

HMRC’s rationale is straightforward: most people want to comply with their tax obligations, and the Let Property Campaign gives landlords a clear window to fix past errors or omissions without immediately triggering the heavier penalties and enforcement actions associated with prolonged non‑compliance.

Why the Campaign Matters

Landlords who have undeclared rental income put themselves at risk of significant financial consequences. HMRC monitors a range of data sources, including information from letting agents, Land Registry records, council tax records and its own advanced data analysis systems. When HMRC identifies discrepancies between declared income and actual property ownership or letting activity, it may send landlords “nudge” letters encouraging them to use the Let Property Campaign.

Responding early and voluntarily to HMRC’s invitation, or acting before any contact, can make a material difference to the penalties charged and the overall impact on your finances.

What Landlords Need to Do

Participation in the Let Property Campaign generally follows a three‑stage process: notification, disclosure and payment.

First, a landlord must notify HMRC of their intention to make a disclosure under the campaign. This can be done online using HMRC’s Digital Disclosure Service or by contacting HMRC directly for guidance. Once HMRC has been informed, you typically have 90 days to complete a full disclosure of any previously undeclared rental income and calculate the tax owed. (GOV.UK)

A full disclosure requires landlords to collect and present detailed records of rental income, allowable expenses, tax computations and any relevant prior returns. After submission, you must pay the outstanding tax, including interest on unpaid amounts. If you cannot pay the whole amount at once, HMRC often allows reasonable instalment arrangements, particularly where landlords have come forward voluntarily.

Penalties and Consequences for Non‑Compliance

One of the core purposes of the Let Property Campaign is to offer landlords an incentive to regularise their tax affairs before HMRC opens a formal enquiry. Penalties for undeclared income can be significant, and their severity depends on why the income was undeclared and whether the disclosure is voluntary or prompted by HMRC.

At one end of the scale, landlords who come forward voluntarily, provide honest and accurate information, and demonstrate full cooperation may face minimal penalty charges. In some cases involving honest errors or inadvertent omissions, penalties can even be as low as 0–10% of the additional tax owed. At the other end, HMRC may impose penalties of up to 100% of the unpaid tax liability for deliberate non‑disclosure, with even higher percentages where offshore elements are involved. Interest on unpaid tax will also apply, and in more serious cases HMRC may pursue criminal investigation or prosecution.

If HMRC opens a compliance check or enquiry before a landlord comes forward, the opportunity to use the Let Property Campaign may be lost and penalties are likely to be higher. This highlights the importance of acting early.

How CMA Accountancy Can Help

For many landlords, especially those with multiple properties, complex rental arrangements or overseas income, navigating the Let Property Campaign can be daunting. That is where professional support from CMA Accountancy becomes invaluable.

An experienced firm can help landlords in several key ways. First, they can review historical rental records and ensure that all income and allowable expenses are properly accounted for across relevant tax years. This groundwork is critical to preparing an accurate full disclosure.

Accountants can also advise on the correct application of tax rules, ensuring landlords claim all legitimate deductions and comply with current UK tax legislation. With their expertise, they can often negotiate with HMRC on your behalf, helping to frame disclosures in a way that supports the most favourable penalty outcomes available under the Let Property Campaign.

For landlords who may struggle to meet payment obligations, professional advisors can help construct realistic payment proposals and guide discussions with HMRC about instalment arrangements. Beyond the immediate campaign, firms like CMA Accountancy provide ongoing compliance support, including preparation of self‑assessment tax returns, quarterly reporting where required under Making Tax Digital, and proactive tax planning for property portfolios.

Conclusion

HMRC’s Let Property Campaign presents both a challenge and an opportunity for UK residential landlords. It underscores the importance of accurate tax reporting but also offers a structured pathway to put things right with reduced penalties. Acting promptly, understanding your obligations and seeking expert support can make all the difference. For landlords unsure about their position or facing a campaign disclosure, partnering with an experienced accountancy firm such as CMA Accountancy can bring clarity, confidence and compliance with the law.