Know About Let Property Campaign: The Landlord's Guide to HMRC's Voluntary Disclosure Route

If you have rental income you never declared, the Let Property Campaign is almost certainly the cheapest way out, and the clock is working against you the longer you leave it. HMRC's Let Property Campaign (LPC), open since 9 September 2013 with no announced end date, is the published voluntary-disclosure route for residential landlords (UK and non-UK resident) with undisclosed rental income. Twelve years in, it still fits most people who find themselves here: accidental landlords, those who inherited a property and have a year or two of unreported rent, long-term landlords whose returns quietly omitted the income from one property in a larger portfolio, and former tenants who moved back in after letting out and have only now realised the historic rents were taxable.

The LPC is not a standalone statutory regime, which matters more than it sounds. It sits within the existing Schedule 41 of the Finance Act 2008 (failure-to-notify) penalty framework and the Schedule 24 of the Finance Act 2007 (inaccuracy) penalty framework. What it gives you is access to the unprompted-disclosure mitigation floors, the lower penalty bands you only reach by self-correcting before HMRC comes knocking. The route operates under TMA 1970 section 7 (notification of chargeability), with discovery time limits at sections 34 and 36 fixing how many years back you have to go.

The decisions that actually change your bill are: whether you fall under Schedule 41 or Schedule 24 (the 12-month qualifier sits on Schedule 41 paragraph 13 only, not on Schedule 24 paragraph 10), whether any offshore Category 2 or Category 3 uplift bites, how far back the discovery time limits reach, and whether the LPC is even the right door versus the Digital Disclosure Service (DDS), the Worldwide Disclosure Facility (WDF), or Code of Practice 9 (CoP9). Each of those is below.

The statutory architecture LPC sits inside

The LPC itself is administrative HMRC practice. The teeth come from three separate provisions, and knowing which one applies to you decides your penalty:

• TMA 1970 section 7: the chargeability-notification obligation. If you have new chargeability to income tax (including new rental income) you must notify HMRC within 6 months of the end of the tax year in which the liability arose. Miss that and you are exposed to Schedule 41. The LPC is the way to put it right.
• Schedule 41 FA 2008: the failure-to-notify penalty framework. Paragraph 5 sets the maximum penalty bands (30% non-deliberate, 70% deliberate, 100% deliberate-concealed). Paragraph 13 sets the mitigation floors on disclosure, including the 12-month qualifier on the 0% non-deliberate unprompted floor: you must disclose within 12 months of the tax becoming payable to reach the 0% floor, otherwise it moves up.
• Schedule 24 FA 2007: the inaccuracy-penalty framework. This applies where you did file self-assessment returns but those returns are inaccurate or understated. Paragraph 4 sets the maximum bands (30% careless, 70% deliberate, 100% deliberate-concealed). Paragraph 10 sets the mitigation floors. Schedule 24 paragraph 10 has no 12-month qualifier on the unprompted 0% careless floor; that qualifier exists at Schedule 41 paragraph 13 only.

Which schedule you land in is the single biggest driver of what you pay. Never filed an SA return for the rental years, and you sit in Schedule 41 (failure to notify); filed but understated the rental income, and you sit in Schedule 24 (inaccuracy). The two regimes mitigate differently, and the 12-month qualifier on the Schedule 41 unprompted 0% non-deliberate floor can swing your floor by tens of percentage points purely on the year-by-year timing of when you disclose.

Eligibility: who can and cannot use the LPC

The LPC is for residential landlords with undisclosed rental income, and the scope is precise. Here is where you fit, and where you do not:

• If you are a UK-resident residential landlord, the LPC is for you. This is the most common case by far.
• If you are a non-UK-resident landlord with UK-source rental, the LPC is still for you. It works alongside the non-resident landlord scheme (NRL): the NRL governs the operational withholding, the LPC puts right the undisclosed historic rental.
• If you hold the property through a limited company, the LPC does not apply. You use the Digital Disclosure Service or a corporation-tax-specific channel.
• If the income sits in a trust, the LPC does not apply. You disclose through the SA900 amendment route or the DDS, and trust-registration obligations under the Trust Registration Service run separately.
• If you let commercial property, the LPC does not apply. Disclosure for commercial-property rental uses the DDS.
• If the rental income is offshore-source, it falls outside the LPC and into the WDF. The dividing line is where the income arises, not where you live. If you are UK-resident with a Spanish villa let to holidaymakers, you disclose through the WDF.

That UK-source versus offshore-source line can get technical at the edges, so be clear on the test. A property physically in the UK and let to UK tenants is UK-source even if you live in Spain, France, or Canada. A property physically overseas is offshore-source even if you are UK-resident and the rent lands in a UK bank account. It is the location of the property, not where you live or where the rent is paid, that decides the route.

The three-step process: Notify, Disclose, Pay

HMRC's published guidance sits at gov.uk/guidance/let-property-campaign. There are three steps:

Step 1: Notify

You tell HMRC you intend to disclose, using the gov.uk LPC notification form. You do not need detailed figures yet; the notification just identifies you and the broad shape of the disclosure (years covered, type of property activity, number of properties). HMRC issues an acknowledgement and a Disclosure Reference Number (DRN), which you quote in everything that follows.

Notifying carries no penalty in itself. All you have done is put your hand up. What it does start is the 90-day clock for the substantive disclosure, which runs from HMRC's acknowledgement.

Step 2: Disclose

Within 90 days of HMRC's acknowledgement, you submit a full substantive disclosure. For each tax year within the disclosure period, it covers:

• Gross rental income per property.
• Allowable deductions (repairs, agent fees, insurance, mortgage interest with the Section 24 restriction layered in for years post-2020/21).
• Net rental profit, taxed at your marginal income-tax rate for the year.
• Interest on the underpaid tax, calculated from the original SA payment date.
• The proposed penalty for the year, worked out against the Schedule 41 or Schedule 24 framework as appropriate.
• Any capital disposals during the disclosure period that need a CGT computation (a property sold mid-window, with under-declared CGT alongside the under-declared rental).

Your supporting evidence pack should include bank statements showing the rental receipts, agent statements where you used one, mortgage statements to back the interest deductions, expense receipts for your other allowable costs, and, where you sold, the contract and completion documentation.

Step 3: Pay

You pay the full disclosed liability (tax plus interest plus penalty) on or before you submit the disclosure. If the total is material you can agree a time-to-pay arrangement with HMRC in advance, but treat that as the exception rather than the rule, and open it before you submit, not after.

A disclosure submitted without payment is not complete, and your unprompted-disclosure mitigation floor depends on completeness: HMRC has consistently treated payment-on-submission as part of it.

The Schedule 41 versus Schedule 24 distinction

The two regimes mitigate differently, so settle which side of the line you sit on before you draft a single figure.

Schedule 41 FA 2008 mitigation floors (failure to notify)

• Non-deliberate, unprompted disclosure within 12 months: 0% (the optimum outcome).
• Non-deliberate, unprompted disclosure after 12 months: 10%.
• Non-deliberate, prompted disclosure: 10%.
• Deliberate, unprompted disclosure: 20%.
• Deliberate, prompted disclosure: 35%.
• Deliberate-concealed, unprompted disclosure: 30%.
• Deliberate-concealed, prompted disclosure: 50%.

That 12-month qualifier on the Schedule 41 non-deliberate 0% floor is where real money is won or lost. Take a common accidental-landlord scenario. You inherit a property in 2022 and let it out from January 2023. You do not register for self-assessment or declare the rental income for 2022/23, 2023/24, or 2024/25. Gross rents are £14,000 / £18,000 / £19,000.

Your 2022/23 tax was due 31 January 2024. By the time your LPC notification goes in (say, mid-2026), you have blown the 12-month qualifier for the 2022/23 year, so your unprompted floor for that year moves from 0% to 10%. Your 2023/24 tax (due 31 January 2025) and your 2024/25 tax (due 31 January 2026) may still reach the 0% floor depending on exactly when you disclose. So you have to run this year by year; the floor is not the same across the whole disclosure period.

Schedule 24 FA 2007 mitigation floors (inaccuracy)

• Careless, unprompted disclosure: 0% (no 12-month qualifier).
• Careless, prompted disclosure: 15%.
• Deliberate, unprompted disclosure: 20%.
• Deliberate, prompted disclosure: 35%.
• Deliberate-concealed, unprompted disclosure: 30%.
• Deliberate-concealed, prompted disclosure: 50%.

Now the Schedule 24 path. Say you have filed SA returns since 2018/19 but only ever declared 70% of your rental income, under-declaring the income from one property in a 4-property portfolio, and a 2024/25 review surfaces the historic understatement. Because you filed returns, Schedule 24 is the operative regime. Your careless-unprompted floor is 0%, with no 12-month qualifier, because that qualifier exists only on Schedule 41 paragraph 13. Do not assume it carries across by analogy; the regimes are statutorily distinct.

Offshore Category 2 and Category 3 uplifts

Where the property or income has an offshore element, Schedule 41 paragraph 6A and Schedule 24 paragraph 4A run the Category uplift. Category 1 territories (the UK and selected close-cooperation jurisdictions) attract no uplift. Category 2 territories attract a 1.5x multiplier on the standard penalty. Category 3 territories attract a 2x multiplier. HMRC publishes the territory lists and updates them periodically.

The uplift turns on where the income or asset is, not on where you live. If you are UK-resident with a UK buy-to-let, there is no Category uplift to worry about. If you are UK-resident with a Spanish villa let to holidaymakers, you have Category 2 exposure (Spain is typically Category 1 or 2 depending on the year, and the published list governs). If you live in Spain but own a UK buy-to-let, there is no Category uplift on that UK property because the income source is UK; the WDF route would only govern any Spanish-source rental.

Picture the non-resident version. You are tax-resident in Spain and own a UK buy-to-let let since 2019, with rents received gross and no NRL withholding. That is a failure to notify under TMA 1970 sections 7 and 8 (the non-resident landlord variant), so Schedule 41 applies. The UK-source rental income stays Category 1 whatever your residence, so the offshore uplift never engages, and your route is the LPC, not the WDF.

The disclosure period: how many years to cover

The disclosure period mirrors HMRC's discovery window under TMA 1970 section 36:

• Innocent error: 4 years from the end of the relevant tax year (section 34).
• Careless behaviour: 6 years (section 36(1)).
• Deliberate behaviour: 20 years (section 36(1A)).
• Offshore innocent error: 12 years (section 36A, inserted by Finance Act 2019).

Your behaviour drives the period. If you genuinely did not know the rental was taxable and disclosed promptly once you found out, you usually fall on the innocent-error or careless side. If you knew it was taxable and chose not to declare, you fall on the deliberate side, which opens the 20-year reach-back.

Be honest with yourself about the time limits, because understating the disclosure period to "save" tax does not survive HMRC scrutiny. If HMRC concludes the conduct was deliberate over a 20-year period, it will expand the disclosure to 20 years and push the penalty toward the deliberate-prompted floor (35% or 50%) instead of the unprompted floor (20% or 30%). A half-disclosure can cost you far more, all in, than a full one from the start.

The LPC versus DDS versus WDF versus CoP9 boundary

Four voluntary-disclosure routes run in parallel, and picking the right one is half the battle.

• Let Property Campaign (LPC): residential landlords with undisclosed rental income.
• Digital Disclosure Service (DDS): the general voluntary-disclosure umbrella for most other UK tax matters: employment income, dividends, self-employment, capital gains, non-rental property matters, company disclosures. It runs online via gov.uk in a notify-disclose-pay pattern that broadly mirrors the LPC.
• Worldwide Disclosure Facility (WDF): offshore-source income or assets. If you have a foreign rental property, foreign investment income, or foreign bank accounts with undisclosed interest, you go through the WDF, not the LPC or DDS.
• Code of Practice 9 (CoP9) / Contractual Disclosure Facility (CDF): the civil-route framework for suspected serious fraud. It carries conditional immunity from criminal prosecution if you make a full and frank disclosure within the 60-day window. CoP9 is HMRC-initiated: you receive a CoP9 letter rather than choosing the route, and you should engage specialist tax-investigation counsel before you respond.

The LPC versus CoP9 boundary is best seen through a harder case. Suppose you have 8 years of undisclosed rental income across a 6-property portfolio, around £280,000 of gross rents over those 8 years, and you became aware of the obligation 4 years ago but did nothing. That 4-year delay once you knew risks being treated as deliberate conduct, and the size of the sums plus the deliberate element edge toward the level where HMRC may take a criminal-prosecution interest.

Which way you go turns on HMRC's posture. If HMRC has issued a CoP9 letter, your route is CoP9, not the LPC. If HMRC has not made contact and you are coming forward yourself, the LPC may still be right for non-deliberate or carelessly-deliberate cases. But where HMRC suspects serious fraud, going in via the LPC will not buy you criminal-prosecution immunity; only CoP9 does that. If serious fraud is even a possibility, get specialist representation early.

What incomplete or false disclosure costs

An incomplete or false LPC disclosure leaves you worse off than no disclosure at all. The Schedule 24 deliberate-concealed penalty at 100% maximum applies on the additional concealed amount, the deliberate-concealment finding opens the 20-year reach-back under TMA 1970 section 36(1A), and criminal-prosecution risk attaches to the concealed element.

The LPC works only with a full and frank disclosure, so the discipline matters. If you are unsure of historic figures (lost rent records, missing bank statements, an unclear deduction history), over-include rather than under-include and flag the uncertainty to HMRC. HMRC has consistently taken a constructive view of disclosures that show clear good faith on incomplete information. A disclosure that quietly leaves out income or years you knew about is exactly what invites a deliberate-concealment finding.

What to expect after submission

HMRC then processes the disclosure and the payment. A typical timeline runs:

• 0 to 4 weeks after submission: HMRC acknowledges receipt of your disclosure and payment.
• 4 to 16 weeks: HMRC reviews it against the records it holds (parallel data from agent reports, mortgage providers, or other third-party sources). Most disclosures are accepted at this stage without further enquiry.
• If HMRC has questions: follow-up correspondence asks for more evidence or clarification on specific points. You respond within HMRC's stated window, and there may be a few more rounds.
• Closure: HMRC issues a closure letter confirming the disclosure is accepted, with the agreed tax, interest, and penalty quantified. Your position for the disclosed years is then settled.

If HMRC fundamentally disagrees with your disclosure (usually on the behaviour, the disclosure period, or how you worked the deductions), things can escalate to a formal enquiry under TMA 1970 section 9A or a discovery assessment under section 29. Most LPC disclosures never get there; the route exists precisely because HMRC would rather you self-corrected than have to investigate you.

Your next step

If you have undisclosed rental income, the practical questions now are whether the LPC is genuinely the right route for you, whether you fall under Schedule 41 or Schedule 24, how the 12-month qualifier hits your earliest year, and how to put together the supporting evidence pack inside the 90-day window. Get those right at the outset and you protect the lowest penalty floor available to you; get them wrong and you can hand HMRC a deliberate-conduct argument you did not need to.

We work with landlords on exactly this, from the initial view on the right route and your year-by-year position through to assembling and submitting the disclosure and seeing it through to closure. If you would like an independent view on where you stand before you notify HMRC, we are happy to help.