Late Filing and Late Payment Penalties: The Self-Assessment Cascade for Individual Landlords (Pre-MTD and MTD ITSA from April 2026)

Miss your self-assessment deadline and the penalty you face from 6 April 2026 depends entirely on one number: your qualifying income. The regime is splitting in two. If your qualifying property and trading income sits below the Making Tax Digital for Income Tax Self Assessment (MTD ITSA) threshold, you stay on the long-established Finance Act 2009 cascades. If it sits above, you move to a newer and tighter architecture: a points-based late-submission regime under Finance Act 2021 Schedule 24, plus an accelerated late-payment regime introduced in the Spring Statement 2025. The split is mandatory, not optional, and it follows the phased threshold (£50,000 from 6 April 2026, £30,000 from 6 April 2027, £20,000 from 6 April 2028).

So which one applies to you? With £52,000 gross rent in 2024/25 you hit MTD ITSA from 6 April 2026 and face the new regime from that point. With £40,000 gross rent you stay on the legacy regime until the £30,000 mandate bites in April 2027. The same default (a missed filing or a missed payment) produces different numbers under the two regimes, so the first thing to get right is knowing which regime governs you in any given tax year. Below are both cascades in operational detail, the reasonable-excuse defence, the 30-day appeal route, and four worked fact patterns through the numbers.

The legacy regime: Finance Act 2009 Schedule 55 late-filing cascade

Schedule 55 to the Finance Act 2009, item 1, sets the late-filing penalty regime for self-assessment income tax and capital gains tax returns under TMA 1970. It still governs you if your qualifying property and trading income sits below the MTD ITSA threshold for the tax year in question.

The cascade structure runs as follows:

• £100 fixed at the filing date. Schedule 55 paragraph 3. The fixed penalty engages on the day after the filing deadline. For electronic self-assessment returns, the filing deadline is 31 January following the tax year under TMA 1970 sections 8 and 8A. For paper returns, the filing deadline is 31 October following the tax year.
• £10 per day from 3 months late, capped at 90 days. Schedule 55 paragraph 4. The daily penalty engages from the day after the 3-month point (1 May for electronic returns due 31 January) and runs for up to 90 days. The maximum daily-stage exposure is £900.
• 5% of tax liability or £300, whichever is greater, at 6 months. Schedule 55 paragraph 5. The 6-month tax-geared penalty engages on the day after the 6-month point (31 July for electronic returns due 31 January).
• 5% of tax liability or £300, whichever is greater, at 12 months. Schedule 55 paragraph 6. The 12-month tax-geared penalty engages on the day after the 12-month point (31 January in the second year following the tax year).
• Deliberate uplift. Schedule 55 paragraph 6(3A) to (5). Where HMRC characterises the failure as deliberate but not concealed, the 12-month tax-geared figure rises to 70% of the tax liability (or £300 if greater). Where the failure is deliberate and concealed (typically with active concealment steps), the figure rises to 100%.

File 12 months late with deliberate conduct and your cumulative exposure is £100 plus £900 (90 days at £10) plus 5% of tax at 6 months plus 70% or 100% of tax at 12 months, plus interest under TMA 1970 section 86 running continuously from the original due date. It is a heavy regime, and deliberately so: it bites hardest on persistent non-compliance, not the occasional slip.

The legacy regime: Finance Act 2009 Schedule 56 late-payment cascade

Schedule 56 to the Finance Act 2009, item 1, sets the late-payment penalty regime for self-assessment income tax and capital gains tax balances under TMA 1970 section 59B. It runs separately from Schedule 55. You can be late paying while having filed on time, or late filing while having paid on time. Both regimes engage where both defaults occur.

The cascade structure runs as follows:

• 5% of unpaid tax at 30 days. Schedule 56 paragraph 3(2). The first late-payment penalty engages 30 days after the original payment due date (2 March for SA balances due 31 January).
• Further 5% at 6 months. Schedule 56 paragraph 3(3). The second tier engages 5 months after the first (1 August for SA balances due 31 January).
• Further 5% at 12 months. Schedule 56 paragraph 3(4). The third tier engages a further 6 months later (1 February in the second year following the tax year).

The cumulative late-payment penalty exposure is 15% of unpaid tax (5% plus 5% plus 5%). Interest under TMA 1970 section 86 accrues alongside continuously from the original due date at the Bank of England base rate plus 4 percentage points.

Payments on account do not trigger Schedule 56

Your TMA 1970 section 59A payments on account (POAs), due 31 January and 31 July, sit outside this cascade. An unpaid POA attracts interest under TMA 1970 section 86 from its due date, but it does not trigger the Schedule 56 5% surcharge. That surcharge engages only on the balancing payment due 31 January under section 59B. Hold the boundary clearly: an unpaid POA is an interest-only event, never a surcharge event.

The MTD ITSA regime from 6 April 2026: points-based late-submission

Once you are above the MTD ITSA qualifying-income threshold, the Finance Act 2021 Schedule 24 points-based regime replaces Schedule 55 item 1 from 6 April 2026 for your quarterly updates and the end-of-period statement / final declaration cycle. The design is fundamentally different: a tolerance-based system, not a fixed-and-tax-geared cascade.

Watch the name clash before it trips you up. The new points regime is at Finance Act 2021 Schedule 24, a separate instrument from Finance Act 2007 Schedule 24 (the long-standing inaccuracy penalty regime that still governs careless and deliberate inaccuracies on returns). HMRC guidance refers to both as Schedule 24; only the year of the parent Act tells them apart. They are not the same thing.

The points regime operates as follows:

• 1 point per missed submission. Each missed quarterly update or end-of-period statement puts 1 point on your compliance record on the day HMRC records the failure. The point itself carries no monetary penalty.
• Threshold at 4 points for quarterly filers. Once you accumulate 4 points within the rolling window, the next missed submission engages a £200 penalty, and every further missed submission while you are at threshold engages a further £200.
• Points reset after 24 months of full compliance. File all required submissions on time for 24 consecutive months and your points balance resets to zero. The reset rewards getting back to discipline after a stumble.
• Different thresholds for different filing frequencies. The Schedule 24 architecture sets different point thresholds for annual filers, quarterly filers, and monthly filers. For an in-scope MTD ITSA landlord, the relevant threshold is 4 points (the quarterly filer level).

The points regime is built to forgive the occasional missed submission while penalising a chronic late-filer pattern. Miss one quarterly update because you were overseas or wrestling with new software and you pick up 1 point but no monetary penalty. Keep missing submissions and you hit the 4-point threshold, where every subsequent miss costs you £200.

The MTD ITSA regime from 6 April 2026: accelerated late-payment

The Spring Statement 2025 introduced an accelerated late-payment cascade for MTD ITSA, with both the rates and the trigger days tighter than the legacy Schedule 56 architecture. If you are in scope, this is the regime that governs your balancing-payment defaults from 6 April 2026.

The cascade structure is:

• 3% from day 15. The first-tier late-payment penalty engages 15 days after the original payment due date. For an MTD ITSA balancing payment due 31 January, the first-tier engages on or around 15 February.
• Further 3% from day 30. The second-tier penalty engages 30 days after the due date.
• 10% per annum from day 31. A daily-accruing penalty at an annualised 10% rate engages from day 31 and continues until the underlying tax is paid.

The shift matters. Under legacy Schedule 56 your first surcharge trigger was at 30 days; under the Spring Statement 2025 regime it is at 15 days. The percentages are lower per stage (3% vs 5%), but the daily-accruing 10%-per-annum from day 31 makes your total exposure materially heavier if you let the position drift past a month.

The drift watchpoint: 15/30/31 day-triggers with 3%/3%/10% rates, not legacy 31/46/91

Here is a trap worth knowing about, because plenty of firms have fallen into it. Some site copy and accountancy-firm guidance has crossed the legacy Schedule 56 31-day / 6-month / 12-month trigger schedule with the new 3% / 3% / 10% percentages, producing a cascade that does not exist in law. For the MTD ITSA late-payment regime the triggers are 15-day / 30-day / day-31 with 3% / 3% / 10% rates. For the legacy Schedule 56 regime the triggers are 30-day / 6-month / 12-month with 5% / 5% / 5% rates. The two regimes do not interpolate, so do not mix and match the days and the percentages.

Worked example 1: legacy regime pre-MTD landlord misses 31 January, files in May

You hold 3 BTL properties personally. Your 2023/24 gross rent was £42,000 (below the £50,000 April 2026 threshold). You should have filed the 2023/24 SA return by 31 January 2025, but you do not file until 14 May 2025. Your tax liability for the year was £6,800 after Section 24 finance-cost restriction and standard property expenses.

Statutory analysis

You are below the £50,000 threshold, so you are on the legacy Schedule 55 / Schedule 56 regime. The penalty cascade runs:

• £100 fixed at 1 February 2025 (Schedule 55 paragraph 3).
• £10 per day from 1 May 2025 (the 3-month point) to 14 May 2025 (the filing date), a total of 13 days at £10 = £130 (Schedule 55 paragraph 4).
• Total late-filing penalty at filing date: £230.
• Schedule 55 paragraphs 5 and 6 (6-month and 12-month tax-geared penalties) are not engaged because filing occurred before the 6-month point.

Payment analysis

Your £6,800 of tax was also unpaid from 1 February 2025. You pay it on filing, 14 May 2025.

• Schedule 56 first-tier 5% at 2 March 2025 = £340.
• Schedule 56 second-tier 5% at 1 August 2025 not triggered (paid 14 May).
• Interest under TMA 1970 section 86 from 1 February 2025 to 14 May 2025 at the prevailing rate (Bank base plus 4pp) at around £140 to £170 depending on the exact base-rate trajectory.

Total exposure

Late-filing penalty £230, late-payment penalty £340, interest around £150, total around £720 on a £6,800 underlying tax liability. In proportional terms the cascade stings, but the absolute number stays contained for a 3.5-month default.

Worked example 2: MTD ITSA in-scope landlord misses Q1 update and balance payment

You hold 4 BTL properties personally. Your 2024/25 gross rent was £58,000 (above the £50,000 April 2026 threshold), and HMRC's notification confirming MTD ITSA scope arrived in Q4 2025, so you are in scope from 6 April 2026. Your first quarterly update period covers 6 April 2026 to 5 July 2026, with the update due 7 August 2026. You miss the 7 August submission entirely (overseas travel plus a struggle adopting new software) and file on 21 September 2026.

Statutory analysis: Schedule 24 FA 2021 points

You pick up 1 point for the missed Q1 update on the date HMRC records the failure (typically the day after the deadline, so 8 August 2026). Assuming no prior accumulation, you are below the 4-point threshold, so no £200 penalty engages yet. The point simply sits on your compliance record. Accumulate 3 further points within the rolling window (typically over the next 12 to 24 months for a quarterly filer) and the £200 per-miss penalty engages from the 4-point threshold onwards.

Late-payment analysis: Spring Statement 2025 cascade

If you also miss the balancing payment due 31 January 2028 for the 2026/27 EoPS / final declaration cycle, the accelerated cascade engages:

• 3% of unpaid tax on or around 15 February 2028 (day 15).
• A further 3% on or around 2 March 2028 (day 30).
• 10% per annum accruing daily from 3 March 2028 (day 31) until paid.

Do not import the legacy Schedule 56 30-day / 6-month / 12-month schedule onto these triggers. Here the 15 / 30 / 31 schedule with 3% / 3% / 10% rates is the one that applies.

Operational point

The points-based regime forgives the occasional missed submission, but do not read it as soft. Once you cross the 4-point threshold, your cumulative exposure as a chronic late-filer in MTD scope can exceed the legacy £100 plus £10 per day plus 5% or £300 cascade. The 24-month reset is a genuine safety valve if you have had one bad year and then get back to discipline.

Worked example 3: reasonable-excuse defence on bereavement

You are a sole-trader landlord with 2 BTL properties held personally. Your spouse dies unexpectedly on 18 November 2024. Your accountant was preparing the 2023/24 SA return, but filing slips during the immediate bereavement period and the probate administration. The return is ultimately filed on 28 March 2025 (8 weeks after the 31 January deadline).

HMRC position

HMRC issues the £100 fixed penalty under Schedule 55 paragraph 3 and a daily-penalty notice at the 3-month point. You appeal under the Schedule 55 paragraph 23 reasonable-excuse defence within the 30-day TMA 1970 section 31A appeal window.

The Perrin four-stage test

The Upper Tribunal in Perrin v HMRC [2018] UKUT 156 (TCC) sets the four-stage test. Applied to your facts:

1. What facts gave rise to the failure? The sudden bereavement of your spouse during the filing window; the bereavement and probate administration took up your attention and disrupted the planned return-preparation timeline.
2. Do those facts amount to a reasonable excuse on an objective test? Bereavement of a close family member is a well-recognised reasonable excuse where it impairs your capacity to attend to your tax affairs during the period of failure. HMRC's operational position is broadly to accept bereavement excuses with documentary support (death certificate, probate documents, the correspondence trail with your accountant over the period).
3. Did the excuse persist throughout the period of failure? The bereavement and probate administration covered the period from mid-November 2024 to mid-March 2025, encompassing the 31 January 2025 deadline.
4. Was the failure remedied without unreasonable delay once the excuse ended? You filed 8 weeks after the deadline and around 2 weeks after the active probate-administration period concluded. The timing is consistent with the bereavement-period excuse and does not show an extended unrelated delay.

Whether HMRC accepts a reasonable-excuse appeal turns on the quality of your documentation. No excuse category is a guaranteed win: the Perrin test is fact-sensitive, and what counts as a reasonable excuse for one person may not for another. At appeal stage your job is to set out the four stages in writing with supporting documents, not simply assert the conclusion.

Worked example 4: dual-stream landlord (personal plus LtdCo)

You hold 3 BTL properties personally (above £50,000 gross, so in MTD ITSA scope from 6 April 2026) and you are also the sole director and shareholder of a property LtdCo holding 2 further properties. You miss both the personal MTD ITSA quarterly update and the CT600 return for the company's accounting period.

Personal-stream analysis

The Finance Act 2021 Schedule 24 points-based regime engages on your personal MTD ITSA stream. You pick up 1 point for the missed quarterly update; once you hit the 4-point threshold it is £200 per miss. The Spring Statement 2025 cascade engages on any balancing-payment default.

LtdCo-stream analysis

Entirely separate regime. The CT600 return obligation sits under FA 1998 Schedule 18 paragraphs 17 and 18:

• £100 fixed at 1 day late; £200 fixed if the return is more than 12 months late on a repeat default.
• Tax-geared 10% of unpaid corporation tax at 6 months late; tax-geared 20% at 12 months late.
• Schedule 56 FA 2009 item 5 governs late-payment of the CT itself: 5% at 30 days; 5% at 6 months; 5% at 12 months.

The fixed figures cycle to £500 for a third repeat-default annual return and to £1,000 or £2,000 for further repeats. For the full company-side mechanics, see our corporation tax deadlines and penalties guide.

Operational point

With both a personal stream and a company stream you face two parallel penalty regimes, not one. Your personal stream sits under MTD ITSA (Finance Act 2021 Schedule 24 plus Spring Statement 2025) or legacy SA (Schedule 55 plus Schedule 56), depending on the £50,000 / £30,000 / £20,000 threshold. Your company stream sits under FA 1998 Schedule 18 plus Schedule 56 item 5. Treat them as the two distinct frameworks they are: default on both and your aggregate exposure is more than any single cascade on its own.

The reasonable-excuse defence: scope and limits

Schedule 55 paragraph 23 (late filing) and Schedule 56 paragraph 16 (late payment) both give you a reasonable-excuse defence. Satisfy the test and the penalty falls away entirely. The controlling authority is Perrin v HMRC [2018] UKUT 156, set out in Worked Example 3.

Categories of excuse that the tribunals have typically accepted:

• Serious illness on your part, particularly where it stops you attending to your tax affairs during the relevant period (medical evidence required).
• Bereavement of a close family member close to the deadline.
• Documented system failure (HMRC online portal outage, recognised software product outage, postal disruption).
• Unexpected events outside your control (fire at the accountant's office, theft of records, severe flooding).

Categories of excuse that the tribunals have typically rejected:

• Pressure of work, including a busy season in your own business.
• Cash-flow shortage as a reason for late payment (the obligation to pay is independent of liquidity).
• Ignorance of the deadline (the obligation to know it is on you).
• Bare reliance on a third party (such as an accountant) who let you down, unless you can show reasonable supervisory care.
• Computer or software problems unless widespread and HMRC-recognised.

At appeal stage, identify the actual reason for the failure, document it, and apply the four Perrin stages honestly. Over-claim the excuse (dressing up routine work-pressure as serious illness, or routine accountant-delay as documented system failure) and the appeal typically fails at HMRC review and then costs you at the First-tier Tribunal.

The appeal route: TMA 1970 section 31A and the First-tier Tribunal

TMA 1970 section 31A gives you a 30-day appeal window against any penalty assessment, running from the date of the assessment notice. Your appeal can be:

• An internal HMRC review (free; typically takes 45 to 60 days for a response).
• An escalation to the First-tier Tribunal (Tax Chamber) under the Tribunals, Courts and Enforcement Act 2007 and the Tribunal Procedure (First-tier Tribunal) (Tax Chamber) Rules 2009 (SI 2009/273).

Miss the 30 days and a late appeal needs an application for admission under the three-stage Martland v HMRC [2018] UKUT 178 test. The Upper Tribunal in Martland weighs (1) the length of the delay; (2) the reasons for it; (3) all the circumstances of the case including the merits of the underlying appeal. The bar for late-appeal admission has tightened over the last 5 to 8 years, so do not assume a minor delay will be waved through.

The First-tier Tribunal applies the penalty regime as Parliament wrote it. Its discretion is narrow: it can uphold or set aside the assessment, but it cannot shave a penalty down on grounds of fairness or personal circumstances unless the reasonable-excuse defence is made out. Before you escalate to a hearing, weigh the merits of your Perrin four-stage application carefully against the costs.

Interest under TMA 1970 section 86: separate, continuous, not mitigated

Interest on unpaid income tax under TMA 1970 section 86 runs continuously from the date the tax was originally due. The rate is the Bank of England base rate plus 4 percentage points, re-fixed periodically as the MPC moves the base rate. The operative figure as of 2026 is the one published on gov.uk's HMRC interest rates page, so check it there for the day you are dealing with.

Three points sit on the interest layer:

• Interest is not mitigated by reasonable excuse. The reasonable-excuse defence works only on the penalty regime, not on interest. Win your appeal against a late-filing penalty and you still owe the section 86 interest on any tax you paid late.
• Interest accrues continuously, not in discrete jumps. The first day of late payment attracts interest; the 365th day attracts interest; the rate is annualised.
• The only way to stop interest accruing is to pay the underlying tax. A time-to-pay arrangement under TMA 1970 section 108 does not pause interest; it simply manages the cash-flow of payment.

If you have several years of underpaid tax, the interest layer can be substantial in its own right. On a £20,000 cumulative underpayment over 3 years at an average effective rate of 7.5%, the cumulative interest is around £2,200, on top of any penalty.

The boundary against the Let Property Campaign route

If the real problem is not a late return on a known liability but rental income you never declared at all, the Let Property Campaign (LPC) route may be the better engagement. The LPC operates under Schedule 41 FA 2008 (failure-to-notify) and unlocks the unprompted-disclosure mitigation floor: 0% non-deliberate within 12 months, 10% non-deliberate after 12 months, 20% deliberate but not concealed, 30% deliberate and concealed.

The line is this. If you filed a return that omitted rental income, the regime is Schedule 24 FA 2007 (inaccuracy penalties) plus any Schedule 55 / Schedule 56 late-filing or late-payment exposure if the return was also late. If you never filed a return at all on the rental income, the regime is Schedule 41 (failure to notify), and the LPC route is the natural way in. For the disclosure-route mechanics, see our LPC orientation, penalty calculator, and why-disclose guides; for the long-history scenario, see our missed-taxes rescue guide.

Practical decision-framework for a landlord facing a penalty assessment

Five-step approach:

1. Is the underlying liability disputed? If yes, the liability appeal under section 31A runs separately from the penalty appeal; the penalty falls if the liability falls. Do not collapse the two arguments.
2. Is there a reasonable-excuse defence? Apply the Perrin four-stage test honestly. Document the facts; do not over-claim the excuse.
3. What is the appeal-window status? 30 days under section 31A is short. Calendar the deadline and lodge the appeal immediately on receipt of the notice; the late-appeal Martland test is materially harder to satisfy than the within-time appeal.
4. What time-to-pay options exist? HMRC will agree time-to-pay under TMA 1970 section 108 where you can show you cannot pay in full. The arrangement does not pause interest, but it manages the cash-flow.
5. Is the underlying failure undisclosed income rather than a late return on a known liability? If yes, the LPC route under Schedule 41 may be the better engagement than fighting the penalty. The unprompted-disclosure mitigation floor (0% or 10% non-deliberate) is typically materially better than the prompted-disclosure floor (10% or 35%) that engages once HMRC has issued an enquiry or discovery assessment.

Which penalty guide do you actually need?

This covers the individual-landlord self-assessment late-filing and late-payment cascade, both the legacy Schedule 55 / Schedule 56 architecture and the MTD ITSA Schedule 24 (2021) and Spring Statement 2025 split. If your question sits in one of the neighbouring regimes, start here instead:

• For RTI submissions on property-business employees, see our PAYE penalties guide: the property-business-employer regime runs under Schedule 55 paragraph 6C plus the RTI Regulations 2003 regulation 67B, a different statutory hook and a different penalty cycle.
• For a LtdCo CT600, see our corporation tax deadlines and penalties guide: the company regime runs under FA 1998 Schedule 18 plus Schedule 56 FA 2009 item 5, with different fixed figures (£100, £200, £1,000, £2,000) and a different tax-geared structure.
• For the wider MTD picture, see our MTD penalties and exemptions guide: it covers the broader MTD penalty framework including the Schedule 24 (2021) exemption categories under SI 2026/336 and the practical outlook.
• For rental income you never declared at all, see our LPC suite (orientation, calculator, why-disclose, missed-taxes-rescue): it covers the failure-to-notify regime under Schedule 41 FA 2008, the natural route for undisclosed income rather than a late return on a known liability.

If a Schedule 55 or Schedule 56 penalty notice has landed and you want a clear steer on your reasonable-excuse position, the state of your appeal window, or whether the LPC route is the better move, this is exactly the work we do with landlords: building the Perrin four-stage application, lodging the section 31A appeal in time, and negotiating time-to-pay with HMRC where the liability is settled but the cash-flow is tight. The 30-day clock is short, so the sooner you get the notice in front of someone, the more of these levers stay open.