HMRC is intensifying its efforts to identify landlords who have failed to declare rental income, with millions of pounds being recovered in unpaid tax each year. Whether you own a single buy-to-let property, inherited a property or receive income from holiday lettings, failing to meet your tax obligations can have serious financial consequences.
With HMRC’s increasing access to property and financial information, landlords should understand the risks of undeclared rental income and the benefits of coming forward voluntarily.
(Reading Time: Approx. 6 minutes)
Topics Discussed:
- Understanding HMRC’s Let Property Campaign, voluntary disclosures and the penalties associated with undeclared rental income.
- Exploring how HMRC identifies undeclared rental income, how far back investigations can extend and what landlords should do when contacted.
HMRC Recovers £104 Million from Landlords
Recent figures demonstrate the scale of HMRC’s efforts to recover unpaid tax from landlords. According to figures obtained through a Freedom of Information request, HMRC recovered approximately £104 million from 11,511 voluntary disclosures during the 2025/26 tax year. This represents the highest number of disclosures since 2018/19, with an average recovery of approximately £9,063 per disclosure.
HMRC’s own property rental statistics also reveal that 2.88 million unincorporated landlords declared rental income in 2024/25, demonstrating the substantial size of the UK rental market. For landlords who have not declared their income, there are five important considerations.
1. HMRC’s Let Property Campaign Allows Voluntary Disclosures
HMRC operates a dedicated disclosure facility known as the Let Property Campaign, which enables individual landlords to declare previously undisclosed rental income and settle outstanding tax liabilities.
According to HMRC’s guidance, updated on 6 April 2026, the campaign covers landlords receiving income from residential property, including those who:
- Rent out one or multiple properties.
- Receive income from inherited properties.
- Operate holiday lettings.
- Live overseas but receive rental income from UK properties.
- Rent out rooms exceeding the Rent a Room Scheme threshold.
The campaign does not cover disclosures made on behalf of companies or trusts, or landlords solely letting commercial property.
Under the scheme, landlords must first notify HMRC of their intention to disclose. Once HMRC acknowledges the notification, they generally have 90 days to calculate their liabilities, submit the disclosure and arrange payment. This provides an opportunity to regularise historic tax affairs before HMRC begins a formal investigation.
2. Voluntary Disclosure Can Significantly Reduce Penalties
One of the most important benefits of voluntarily declaring rental income is the potential reduction in financial penalties. HMRC calculates penalties according to the circumstances surrounding the failure to declare income, including whether the taxpayer’s actions were careless or deliberate.
For UK rental income, penalties can range from 0% to 100% of the unpaid tax. Certain offshore liabilities can attract penalties of up to 200%. HMRC generally considers voluntary disclosure more favourably than situations where undeclared income is discovered through an investigation. However, the level of reduction depends on the individual circumstances, including how promptly the landlord comes forward.
It is also important to understand that voluntary disclosure does not eliminate the underlying tax liability or the statutory interest charged on overdue tax.
3. HMRC Has Extensive Powers to Identify Undeclared Rental Income
Landlords should not assume that rental income will remain undetected simply because it has not been declared for several years. HMRC possesses extensive information-gathering powers and can obtain third-party financial information to identify discrepancies between reported income and property ownership.
Under Schedule 23 of the Finance Act 2011, HMRC can obtain information from data holders, including details of rental payments made by letting agents to landlords. This information can be considered alongside property ownership records and other financial data when investigating potential tax irregularities.
Consequently, a landlord who has received rental income for many years without declaring it could face an investigation even where previous tax returns have not been challenged. The increasing availability of third-party information makes accurate reporting and maintaining comprehensive financial records particularly important.
4. HMRC Can Investigate Up to 20 Years of Undeclared Income
A common misconception among landlords is that HMRC can only investigate the previous four or six tax years. In reality, the period HMRC can assess depends on the circumstances surrounding the unpaid tax.
HMRC’s Let Property Campaign guidance identifies three principal time limits:
| Circumstances | Maximum period |
|---|---|
| Errors despite taking reasonable care | 4 years |
| Careless errors | 6 years |
| Deliberate inaccuracies or failure to notify liability | 20 years |
Importantly, a failure to notify HMRC of a taxable rental income source can potentially result in liabilities extending back 20 years, even where the landlord has not deliberately concealed income. This distinction is particularly relevant for individuals who inherited rental properties or mistakenly believed that income did not need to be declared.
Voluntary disclosure does not automatically reduce the number of years HMRC can assess. Nevertheless, obtaining specialist advice can help establish the correct period, calculate allowable expenses and ensure that liabilities are not overstated.
5. Never Ignore an HMRC Nudge Letter
HMRC regularly contacts taxpayers where information suggests they may have undeclared income. These communications are commonly referred to as ‘nudge letters’. Receiving such a letter does not necessarily mean HMRC has already established that tax is owed. However, ignoring correspondence can result in further enquiries and potentially more serious compliance action.
Where HMRC subsequently opens a formal investigation, the opportunity to benefit from the most favourable voluntary disclosure treatment may be restricted. HMRC’s guidance confirms that disclosures made after notification of an intended compliance check are unlikely to be accepted under the normal Let Property Campaign arrangements.
For this reason, landlords receiving correspondence should obtain specialist tax advice promptly rather than attempting to resolve potentially complex historic liabilities without appropriate guidance.
Understanding Your Rental Income Obligations in 2026/27
For the current tax year, the standard property income allowance remains £1,000 per year. Individuals whose gross rental income exceeds this amount may need to notify HMRC, although their reporting obligations depend on their particular circumstances.
Rental profits are generally subject to Income Tax at the applicable rates of 20%, 40% or 45% in England, Wales and Northern Ireland, with different income tax bands applying in Scotland. Allowable expenditure and relevant reliefs must be considered when calculating taxable profits.
Landlords who first become liable to notify HMRC for 2026/27 will generally need to register for Self-Assessment by 5 October 2027.
Summary
HMRC’s recovery of £104 million from landlords during 2025/26 highlights the financial consequences of undeclared rental income and the importance of meeting tax obligations.
Although the Let Property Campaign provides an opportunity to correct historic omissions, penalties, interest and potentially lengthy investigations remain significant considerations. If you have undeclared rental income, have received an HMRC nudge letter or are concerned about a potential investigation, get in touch with us at Tax Expert.
Fill out our form here, email us at info@taxexpert.co.uk, or message us on our WhatsApp for out of office hours.
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Kind regards,
Ilyas Patel
