In 2025/26, landlords who voluntarily disclosed undeclared rental income to HMRC through the Let Property Campaign paid an average penalty under 5 percent of the tax owed. Landlords caught by an HMRC enquiry first faced penalties between 18 and 21 percent, roughly four times higher. The difference comes entirely from who comes forward first.
We prepare voluntary disclosures under the Let Property Campaign, calculate the tax, interest, and penalty owed, and handle all correspondence with HMRC through to settlement. Once disclosed, this connects into our ongoing landlord accounting and Self Assessment services, so your tax affairs stay current going forward.
Once HMRC opens an enquiry, any disclosure that follows is treated as prompted, and the minimum penalty rate jumps sharply compared to coming forward first. HMRC’s Connect system already cross-references Land Registry data, mortgage records, and bank information, so undeclared rental income is increasingly likely to surface on its own. This is exactly why timing matters more than almost anything else in this process. We prepare the disclosure and submit it as an unprompted notification, before any HMRC enquiry begins.
This service is for individual landlords in or around Slough who have not fully declared rental income to HMRC.
We notify HMRC of your intention to disclose, opening the 90 day window to complete the process.
We calculate exactly what is owed across every affected tax year, including interest.
We prepare the complete disclosure document, presenting your case in the best possible light for a lower penalty.
We handle all correspondence with HMRC directly, through to final settlement.
Voluntary, unprompted disclosures averaged under 5 percent of the tax owed in 2025/26, well below the 18 to 21 percent typical of HMRC-prompted cases.
Typically 4 years for reasonable care, 6 years for careless errors, and up to 20 years where HMRC considers the non-disclosure deliberate.
90 days from HMRC’s acknowledgment of your notification to submit the full disclosure and payment.
A full, honest voluntary disclosure significantly reduces this risk. Prosecution is far more likely where HMRC identifies deliberate concealment first.
Our team is part of Direct Assist Accountants' ACCA-regulated practice in Slough
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