HMRC Let Property Campaign — Penalties, How Far Back & Disclosure

Who it's for — and who it isn't

HMRC's own guide is specific: “The Let Property Campaign is for landlords who owe tax through letting out residential property in the UK or abroad.” That scope is wider than most landlords assume — it explicitly covers “renting out a single property… multiple properties… a room in your main home that's over the Rent a Room Scheme threshold… holiday lettings… if you've inherited a property and renting it out.”

It does not cover everyone: excluded are “landlords who are letting out non-residential properties, such as a shop, garage or lock up”, and disclosures “on behalf of a company or a trust.”

How far back can HMRC go?

The penalty table — HMRC's own numbers

The Let Property Campaign guide points readers to HMRC's failure-to-notify factsheet, CC/FS11, for the statutory penalty range. This is the applicable table for the classic case — income that was never declared at all:

Where you land in each range depends on how much you help HMRC. CC/FS11: reductions of “up to 30%” for telling HMRC about the tax owed, “up to 40%” for helping HMRC work it out, and “up to 30%” for giving access to your records. Two statutory ceilings sit above the whole table: HMRC's guide caps penalties at “100% of the tax liability if the income or gain arose in the UK” and “200% for an offshore liability.”

Note: CC/FS11 is the failure to notify factsheet — for income never declared at all, the classic accidental-landlord case. If you filed a return but understated the income (rather than never registering), a related but different factsheet, CC/FS7A, applies with a similar but not identical table — we have not fetched CC/FS7A for this update, so don't assume the table above applies to an inaccurate-return case without checking.

How the disclosure actually works

The mechanics, in HMRC's own sequence: you notify HMRC that you intend to make a disclosure, then “you'll then have 90 days to work out and pay what you owe.” That 90-day clock is the practical deadline that matters once you've started the process — it's when you calculate the tax, work out the penalty within the ranges above, and pay.

Interest

On top of tax and penalty, HMRC adds interest: “HMRC charges interest from the date tax is due until the date it is actually paid. Interest is worked out on a daily basis.” We have not sourced the current daily interest rate itself for this update — it moves with the Bank of England base rate — so we aren't printing a number for it here; treat the illustration below as tax-plus-penalty only.

Worked illustration

This is an illustration of how the table works, not advice for a real case. A landlord never registered for Self Assessment despite £6,000/year of unpaid tax on undeclared rental income, and comes forward voluntarily (unprompted) before HMRC contacts them. HMRC treats it as non-deliberate.

Two things the illustration deliberately shows: HMRC's guide says never registering can be charged back up to 20 years, not just 4 — we used 4 only to keep the maths readable — and where you land inside the 0%–30% range depends entirely on how proactively and fully you disclose, which is exactly what the “telling / helping / access to records” reductions are for.

Work it out on your own numbers

We're building a dedicated Let Property Campaign penalty calculator that applies this exact table to your years, tax owed and disclosure route. If that link isn't live yet when you're reading this, it's in progress — check back, or use the table and worked illustration above to estimate your own position in the meantime.

gov.uk “Let Property Campaign: your guide to making a disclosure” (updated 6 Apr 2026) · HMRC factsheet CC/FS11, “Compliance checks: penalties for failure to notify”. Both checked 4 Sep 2026. The illustration above is ours, built on the sourced table — label it exactly that, not a quoted HMRC example.