HMRC Targets Landlords With Undeclared Rental Income: What You Need to Know in 2026
HMRC has significantly intensified its crackdown on landlords with undeclared rental income, and thousands across the UK are now receiving compliance letters urging them to review and correct their tax affairs.
If you’re a landlord who has received one of these letters—or you’re worried you might—this guide explains what’s happening, why HMRC is acting now, and how HUSA Accountants can help you navigate the process with confidence.
📌 Why HMRC Is Contacting Landlords
In May 2025, HMRC issued over 4,000 compliance letters to landlords suspected of failing to declare rental income. This forms part of a wider strategy to close the tax gap using enhanced data‑matching technology and cross‑agency cooperation.
HMRC now pulls information from:
- Tenancy deposit schemes
- Land Registry records
- Mortgage lenders and banks
- Online platforms such as Airbnb, Booking.com and Vrbo (which are legally required to share host income data with HMRC from January 2025)
- Anonymous public tip‑offs
This means undeclared rental income is easier than ever for HMRC to detect.
📩 What the HMRC Letter Usually Contains
Landlords typically receive a “nudge letter” asking them to complete a Certificate of Tax Position within 30 days. The letter usually presents three options:
- You have declared rental income, but not the full amount
- Your tax affairs are fully up to date
- You have not declared any rental income
Choosing option 2 without certainty—or ignoring the letter—can trigger deeper HMRC investigation and harsher penalties.
🛠 The Let Property Campaign: A Chance to Put Things Right
HMRC encourages landlords to use the Let Property Campaign (LPC) to voluntarily disclose undeclared rental income. Under the LPC:
- You notify HMRC of your intention to disclose
- You get 90 days to calculate and pay what you owe
- Penalties are significantly reduced for voluntary disclosure
- You avoid the risk of criminal investigation
The LPC remains the most efficient and cost‑effective route for landlords to regularise their tax affairs.
⚠️ What Happens If You Don’t Act?
Penalties for non‑disclosure can be severe:
- 10% to 100% of unpaid tax depending on behaviour and duration
- Interest charges
- Investigations going back up to 20 years
- In serious cases, legal action or prosecution
Ignoring HMRC’s letter is the worst option.
⭐ Why Landlords Choose HUSA Accountants
At HUSA Accountants, we specialise in helping landlords respond to HMRC compliance letters, make disclosures under the Let Property Campaign, and resolve historic tax issues with minimal stress.
Here’s what sets us apart:
✔ Expertise in HMRC Investigations & Property Tax
We deal with HMRC enquiries, disclosures, and landlord tax matters daily. Our team understands exactly how HMRC assesses risk and how to present your disclosure accurately and professionally.
✔ Proven Track Record
Our clients consistently praise our professionalism, clarity, and results. Our Google reviews reflect the trust and satisfaction of landlords who have relied on us to resolve complex tax issues and negotiate with HMRC on their behalf.
✔ Stress‑Free Process
We handle everything—from reviewing your rental history to preparing your disclosure and communicating with HMRC—so you can move forward with peace of mind.
🧭 What You Should Do Next
If you’ve received a letter from HMRC—or suspect you may be contacted—take these steps immediately:
- Do not ignore the letter
- Do not respond to HMRC without professional advice
- Gather your rental income and expense records
- Contact HUSA Accountants for a confidential review
The sooner you act, the more options you have—and the lower your penalties are likely to be.