Making Tax Digital Late Payment Penalties: 2026 Guide

Making Tax Digital late payment penalties charge 3% of the tax owed at day 15, a further 3% of the tax owed at day 30, and then an annual rate of 10% accruing daily from day 31 until the balance clears. In your first year inside the regime only, you have 30 days from the due date to pay or agree a plan. Fifteen days thereafter.

That is the whole ladder, and it is deceptively short. What it does not tell you is how the arithmetic behaves once the sum in question is a six-figure balancing payment rather than a modest self-employment liability, or what happens when the person holding that liability also answers to the IRS on an entirely different payment calendar. At Jungle Tax we prepare returns on both sides of the Atlantic, and the late payment ladder is where we see well-advised, entirely solvent clients lose meaningful sums for reasons that have nothing to do with an inability to pay.

This guide covers the late payment ladder only. Late submission is governed by a separate points-based regime with its own triggers and thresholds, and it is not addressed here.

How the Making Tax Digital late payment ladder actually works

The regime is not point-based and there is no accumulation across years. Each late payment is assessed on its own facts, and the charge depends entirely on how long the money stays with you rather than with HMRC. There are three distinct stages, and it is important to understand that they are cumulative rather than alternative — reaching day 31 does not replace the day 15 and day 30 charges, it adds to them.

Stage one: days 1 to 15

Nothing. No penalty arises if the balance is paid in full within 15 days of the due date. This is a genuine grace window rather than a rounding tolerance, and it is available every year, not just the first. Late payment interest, however, runs from day one regardless — the 15-day window buys relief from the penalty, not from the interest clock.

Stage two: day 15

A penalty of 3% of the tax owed at day 15 crystallises. Note the wording carefully: it is 3% of the amount outstanding on that day, not 3% of the original liability. A part payment made on day 10 therefore shrinks the penalty base permanently. This is the single most valuable point in the entire regime for a client with partial liquidity, and it is the point most commonly missed — filers who cannot pay in full frequently pay nothing at all, when paying most of it would have cut the charge proportionately.

Stage three: day 30 and day 31 onwards

At day 30 a further 3% of the tax owed at day 30 is charged. From day 31, an annual rate of 10% is applied to the outstanding balance and accrues daily until the tax is paid, subject to a maximum run of two years. So a balance that is still outstanding two years after day 31 will have attracted 3%, plus 3%, plus the full two-year run of the 10% annual charge.

Stage	2026 to 2027 tax year	2027 to 2028 tax year
Days 1 to 15	No penalty	No penalty
Day 15	3% of the tax owed at day 15 (nil in your first year)	4% of the tax owed at day 15 (nil in your first year)
Day 30	A further 3% of the tax owed at day 30	A further 4% of the tax owed at day 30
Day 31 onwards	Annual rate of 10%, charged daily, for up to two years	Annual rate of 10%, charged daily, for up to two years
Interest	Runs from day one, in addition to all of the above	Runs from day one, in addition to all of the above

The percentages at day 15 and day 30 are scheduled to rise from 3% to 4% for the 2027 to 2028 tax year. The 10% annual rate is not currently scheduled to change. Full details are set out in HMRC's guidance on penalties for Making Tax Digital for Income Tax.

What the first-year easement does and does not do

In your first year inside the new penalty regime, HMRC gives you 30 days from the payment due date either to pay in full or to contact them to set up a payment plan. Within that window, the day 15 charge does not bite.

Read that carefully, because it is narrower than most commentary suggests. The easement is a shelter you occupy only while you are inside 30 days. HMRC's published table shows no first-year exception at the day 31 stage. The reasonable reading — and the one we plan around — is that a first-year filer who sails past day 30 does not keep the day 15 relief; the shelter falls away and the full ladder applies from day 15 as though the easement had never existed. Treating the first year as a free month is therefore an expensive misreading. It is a conditional deferral, and the condition is that you actually land inside it.

What does this cost on a six-figure balancing payment?

Generic guidance illustrates the ladder with four-figure liabilities, where the numbers look like an administrative irritation. For our clients — founders taking dividends after an exit, executives with large unsheltered investment income, non-doms settling a remittance-linked liability — the balancing payment routinely runs into six figures, and the ladder stops being an irritation.

Take a balancing payment of £400,000 outstanding after the due date, assuming no part payments and no payment plan.

Paid on	Day 15 charge	Day 30 charge	Daily 10% element	Total penalty
Day 14	Nil	Nil	Nil	Nil
Day 20	£12,000	Nil	Nil	£12,000
Day 45	£12,000	£12,000	£1,644	£25,644
Day 120	£12,000	£12,000	£9,863	£33,863
Two years past day 31	£12,000	£12,000	£80,000	£104,000

Three things fall out of that table that no summary of the rules will tell you.

• The first six days after day 14 are the most expensive in the calendar. Moving from day 14 to day 20 costs £12,000 and nothing else changes. There is no taper, no proportionality and no de minimis — the 3% lands whole.
• The day 30 cliff doubles it for a fortnight's delay. Day 20 to day 45 costs a further £13,644 on the same unchanged balance.
• The two-year cap is not a comfort. At the ceiling the penalty burden reaches £104,000 on a £400,000 liability — 26% of the tax — before a penny of interest is added. Interest accrues separately at the Bank of England base rate plus four percentage points and is not capped by the two-year limit on the daily penalty element.

Scale it down and the shape is identical. On a £120,000 balancing payment the day 30 exposure is £7,200, and by day 120 the total penalty is approximately £10,159. On any liability of this size, the cost of six days' inattention exceeds most annual compliance fees several times over.

Why the first-year grace is spent once and never returns

The first-year easement is the most misunderstood feature of the regime, and the misunderstanding is structural rather than arithmetical. Clients treat it as a standing tolerance. It is not. It attaches to your first year inside the new penalty regime and to no other year, and once that year passes it is gone permanently.

The practical consequence is worth stating plainly. A filer with a £400,000 balancing payment who pays on day 28 in their first year pays nothing. The identical filer, the identical balance, the identical 28-day delay in year two pays £12,000. Nothing about the taxpayer's behaviour has changed. Only the calendar has.

This matters more for US-connected clients than for anyone else, because the first year is precisely when the two filing systems are least well synchronised. A client who has just been drawn into Making Tax Digital is usually also reworking how their UK figures feed their US return, and that first cycle is where the timing slips happen. Spending the easement on a first-year process failure means facing every subsequent year — when the same structural friction is still present — with no cushion whatsoever.

Which year constitutes your first year depends on when you were brought into the regime, and mandation was staged by qualifying income. Anyone uncertain which cycle burns their easement should establish it before the first relevant due date, not afterwards. Our US-UK tax accountants map this for every client at onboarding, because the answer changes the entire cash-management plan for that year.

How the HMRC ladder collides with a US filer's payment calendar

This is where generalist guidance stops and where the real exposure for our clients begins. The UK late payment ladder was designed for a taxpayer with one tax authority. Our clients have two, and the two operate on calendars that were never reconciled with each other.

The two calendars do not line up

The UK balancing payment for a tax year falls due on 31 January following the end of that tax year, alongside the first payment on account for the following year. The day 15 cliff therefore lands in mid-February and the day 30 cliff at the start of March.

The US position is different in a way that catches people out every year. A US citizen or green card holder resident abroad receives an automatic extension to file, but that extension does not extend the time to pay. The US balance is due in April, and interest runs from that date irrespective of the filing extension. The result is two large, immovable payment dates roughly ten weeks apart, with the HMRC penalty ladder falling entirely inside the gap.

The failure pattern we see is consistent. A client holding dollars intended to meet the April US liability, or waiting on a Q1 liquidity event, or expecting a US refund to fund part of the UK bill, allows the January UK payment to slip by three or four weeks in the belief that it is a matter of interest rather than penalty. On a large balancing payment that belief costs 3%, then 6%. The money was always there. The sequencing was wrong.

Paying UK tax late can also damage your foreign tax credit position

This is the cross-border consequence that is almost never mentioned, and it can cost considerably more than the penalty itself.

A US taxpayer claiming foreign tax credits on the cash basis credits foreign tax in the US year in which it is paid. Deferring a UK balancing payment across a year end therefore does not merely trigger the HMRC ladder — it moves the credit into a different US tax year from the one you had planned it for. Push two UK payments into one US year and you can generate excess credit in that year while leaving the adjacent year under-credited and exposed to US tax that would otherwise have been fully sheltered. Carryback and carryover relief exists but is limited and is not a substitute for correct timing. HMRC's ladder charges you for the delay; the IRS then charges you again through the mismatch. The mechanics are set out in the IRS guidance on the foreign tax credit, and this interaction is a core part of our cross-border tax planning work.

Penalties and interest give you no relief anywhere

A UK late payment penalty is not a creditable foreign income tax for US purposes. Neither is UK late payment interest. So unlike the underlying income tax — which generally produces a credit against your US liability and therefore has an effective net cost well below its face value — the penalty is a pure, unrelieved cash loss on both sides of the Atlantic. A £12,000 day 15 penalty is £12,000 gone. That asymmetry is why we treat UK payment dates as harder deadlines for US-connected clients than for purely domestic ones.

Getting the money there is slower than clients expect

Payment is treated as made when HMRC receives it, not when you instruct it. Clients funding a six-figure UK liability from a US brokerage or bank account routinely underestimate the chain: liquidation and settlement, an international transfer, currency conversion, and correspondent banking delays, with compliance holds on large first-time transfers a frequent complication. A client who initiates payment on day 12 confident of beating the day 15 cliff can easily arrive on day 17. Build a working week of slack into the plan, and never rely on same-day mechanics for a cross-border transfer.

US and UK late payment charges compared

Understanding how differently the two authorities price the same behaviour explains why the UK side deserves the earlier attention.

	HMRC — Making Tax Digital for Income Tax	IRS — failure to pay
Grace period	15 days, no penalty	None; the charge runs from the due date
Initial charge	3% of the balance at day 15	0.5% of the unpaid tax per month or part month
Escalation	A further 3% at day 30	No equivalent step; accrual is linear
Ongoing charge	10% annual rate, daily, up to two years	Continues monthly to a 25% ceiling
Effect of a payment plan	Contacting HMRC pauses further penalties from the date of contact	The monthly rate is generally reduced while an approved installment agreement is in force
Front-loaded?	Severely — 6% within 30 days	No — roughly 3% after six months

The point of the comparison is the front-loading. A US filer whose instincts were formed by the IRS regime, where a month's delay costs half a percent, will systematically under-react to an HMRC regime where a month's delay costs six percent — twelve times as much. Full IRS detail is in the guidance on the failure to pay penalty.

What is outside the late payment ladder?

Late payment penalties do not apply to payments on account. For a client with a substantial and volatile income profile the July payment on account can itself be a six-figure sum, and it does not carry the ladder.

Do not over-read that. Interest still runs on a late payment on account, so the money is not free. And the exclusion is a trap in one specific respect: a payment on account paid late is fine as to penalty, but if the underlying position means the eventual balancing payment is larger, that balancing payment carries the full ladder. Clients who habitually run payments on account late because "there is no penalty" tend to arrive at 31 January with a larger balance than they had modelled — and that balance is fully exposed.

Stopping the clock: Time to Pay

Contacting HMRC to agree a payment plan pauses further late payment penalties from the date of contact, provided a plan is agreed and then kept. The operative date is the date of contact, not the date the plan is finally agreed, which makes early contact valuable even when the arrangement takes weeks to conclude.

Three points matter for internationally mobile clients. First, an approach made on day 13 protects the whole ladder; one made on day 16 does not undo the 3% already crystallised. Second, a broken plan generally reinstates the penalty position, so agreeing terms you cannot service from a foreign-currency income stream is worse than agreeing none. Third, HMRC will want to understand the assets available to meet the debt, and a client with substantial offshore holdings should expect that conversation to be searching. HMRC's general guidance on difficulties paying HMRC sets out the process.

Practical steps for US-connected filers

• Fix the UK number early. Reach a reliable estimate of the balancing payment well before January, not in the week before it falls due. Liquidity decisions on six-figure sums cannot be made in days.
• Establish which year is your first year inside the penalty regime, and treat the easement as a one-off asset to be deployed deliberately — never as routine slack.
• Sequence UK before US. The UK January date precedes the US April date, and the UK charge for missing it is an order of magnitude heavier. Fund the UK liability first.
• Pay something even if you cannot pay everything. Because both 3% charges are struck on the balance outstanding on the relevant day, a part payment permanently reduces the penalty base.
• Contact HMRC before day 15, not after, if a shortfall is likely. The value of the pause depends entirely on when you make contact.
• Model the foreign tax credit consequences of any deferral before you decide to defer. The penalty may be the smaller of the two costs.
• Allow a full week for international funds to clear. Payment is made when HMRC has it.

Appeals and reasonable excuse

A late payment penalty can be appealed, generally within 30 days of the notice, on the basis of a reasonable excuse — an unusual event outside your control that directly prevented timely payment, where you then acted without unreasonable delay once it ended.

Set expectations realistically. A shortage of funds is not ordinarily a reasonable excuse. Nor is pressure of work, nor reliance on another person where you have not taken reasonable care. Cross-border facts do not automatically help either: being abroad, holding assets in another currency, or waiting on a US refund will not on their own persuade HMRC. What can carry weight is a documented, genuinely external failure — a banking or transfer failure outside your control, properly evidenced and promptly remedied. If you intend to rely on such an event, preserve the evidence contemporaneously. Reconstructing it months later rarely succeeds.

Where this sits in a wider compliance position

For most of the clients who come to us, a late payment exposure is a symptom rather than the disease. It usually indicates that the UK and US cycles are not being run as a single process — figures finalised too late, liquidity planned against the wrong date, or a historic filing gap that has left the current year's numbers unstable. Where there are unfiled US returns or unreported UK accounts behind the problem, that has to be resolved first; our IRS streamlined filing team handles those cases, and we regularly work them alongside a current-year UK payment plan. For clients whose affairs simply demand tighter coordination, our high net worth practice runs both calendars as one.

If you are facing a substantial UK balancing payment, are approaching your first year inside the Making Tax Digital penalty regime, or have already crossed one of these thresholds and want to limit the damage, we would be glad to help. Please contact our cross-border team for a confidential consultation. We will tell you precisely where you stand on the ladder, what each remaining day costs, and how to sequence your UK and US payments so that neither authority charges you for the other's calendar.