Missed UK Tax Returns: HMRC Time to Pay on a Catch-Up

An HMRC Time to Pay arrangement is a negotiated instalment plan for tax you already owe. After a cross-border catch-up, missed UK tax returns crystallise several years of tax, interest and penalties on a single date. HMRC will only discuss instalments once every outstanding return is filed and the liability is fixed.

That single sentence contains the two facts that most disclosure clients discover too late. First, the arrangement is discretionary: HMRC has no obligation to grant one, and for a taxpayer with meaningful wealth the default answer is "sell something and pay us." Second, the clock does not stop. Interest continues to run on the whole balance for the entire life of the arrangement, and some penalty charges continue to crystallise unless the arrangement is agreed before the relevant trigger date. A Time to Pay arrangement buys liquidity, not forgiveness.

At Jungle Tax we prepare US and UK returns for internationally mobile individuals who are bringing several years of filings back into order at the same time. This guide sets out what an arrangement actually is, how a wealthy taxpayer's proposal is assessed and evidenced, how the interest and penalty positions keep running underneath it, and — the part almost no UK-only guide addresses — how the UK payment schedule interacts with a US filing that is already in flight.

What is an HMRC Time to Pay arrangement — and what it is not

Time to Pay ("TTP") is HMRC's collection mechanism for tax that is due but cannot be paid immediately. It is administered by HMRC's Debt Management function under its collection and management discretion rather than under a specific statutory entitlement, which is why the published guidance sits in the Debt Management and Banking Manual and in the general "If you cannot pay your tax bill on time" guidance rather than in the Taxes Acts.

It is worth being precise about the boundaries, because the misconceptions are expensive:

• It is not a settlement or a reduction. Nothing is written off. You pay 100% of the tax, 100% of the penalties that stand, and interest on both.
• It is not a substitute for filing. HMRC will not negotiate a schedule against an estimated or unquantified debt arising from unfiled years.
• It is not an appeal. If you believe a penalty is wrong, that is a separate track — a reasonable excuse appeal, a request for special reduction, or a formal review. Agreeing to pay a penalty by instalments does not preserve or prejudice that argument, but the two processes must be run deliberately and in parallel.
• It covers arrears only. Liabilities that fall due after the arrangement starts — most importantly payments on account — sit outside it and must be paid on time. This is the single most common cause of a catch-up arrangement collapsing.
• It is discretionary. HMRC can decline. There is no appeal to the tax tribunal against a refusal, because the tribunal's jurisdiction is over liability, not collection.

Why a cross-border catch-up produces a balance that cannot be paid at once

A US-connected individual who has been UK resident for several years without filing Self Assessment returns rarely has one year of tax to pay. They typically have four, five or six, and the profile of the liability is unusually concentrated:

• Investment and portfolio income that was never within PAYE — US dividends, interest, distributions from US brokerage accounts, and gains realised inside a US portfolio that the UK taxes on an arising basis.
• Offshore fund gains where US mutual funds and ETFs are non-reporting funds for UK purposes, so the gain is taxed as an offshore income gain at income tax rates rather than at capital gains rates. This alone frequently doubles the expected number.
• US retirement and equity compensation — vesting RSUs, option exercises and distributions that were taxed correctly in the US and reported nowhere in the UK.
• Property and rental income from a retained US home.
• Several years of interest at a rate that has spent most of the recent period at or near the high single digits.

Because all of that becomes payable on the date the returns are filed rather than across the six years it economically relates to, an individual with a perfectly sound balance sheet can face a genuine liquidity problem: the wealth is in illiquid holdings, in a US retirement account that cannot be accessed without a punitive US tax cost, or in a business. That is precisely the scenario Time to Pay exists for — but you have to present it in HMRC's language, not yours.

You cannot negotiate until the returns are filed

This is the sequencing rule that governs everything else. HMRC will not enter into a Time to Pay arrangement while returns remain outstanding, because until the returns are processed there is no quantified debt to schedule. In a multi-year catch-up this has three practical consequences.

The whole catch-up must be completed as one project. Filing three of five years and negotiating on those, intending to file the rest later, will normally cause HMRC to decline or to insist on renegotiation once the remaining years land. Prepare all years, file them together, let them post to the Self Assessment account, then open the conversation.

The debt becomes payable immediately on filing. Late-filed returns for closed years do not get a fresh 31 January due date; the original due dates applied, so the tax is already overdue and interest has been accruing throughout. Filing crystallises a balance that is, on day one, fully in arrears.

You need the numbers before you file. Have the funding plan and the proposed schedule ready before the returns hit HMRC's system, so the gap between the debt appearing and the arrangement being agreed is measured in days, not months. Every week in that gap is interest, and it may be the week a penalty trigger date passes.

Why the online self-serve plan will almost certainly be unavailable

Most published guidance leads with the online Self Assessment payment plan. It is largely irrelevant to a catch-up client, because the self-serve route is gated on conditions a multi-year disclosure fails on every count. The online facility is generally limited to balances at or below £30,000, requires you to be within a short window of the payment deadline (commonly stated as 60 days), requires all returns to be filed, and requires that you have no other payment plan or debt with HMRC.

A five-year cross-border catch-up is typically well above the threshold, and by definition is years past the original payment deadlines. The route is therefore a negotiated arrangement by telephone or written proposal with HMRC's Debt Management team — a very different exercise, with a very different evidential burden.

How HMRC assesses a wealthy taxpayer's Time to Pay proposal

For a modest debt, HMRC will often accept what you tell it. For a large or complex debt — which is what a cross-border catch-up produces — it will not. Expect a genuine affordability review, and expect it to be sceptical.

The income and expenditure review

HMRC builds a picture of income, expenditure, assets and liabilities in order to calculate disposable income, then proposes a monthly figure as a proportion of that disposable income. The working convention frequently cited is that HMRC looks for around half of disposable income, and expects a higher proportion where disposable income is large. For a high earner, "essential expenditure" is scrutinised: school fees, discretionary investment contributions, staff and second-property costs are not treated the way a household budget line would be.

Assets, liquidity and the question you must answer first

This is where high-net-worth arrangements are won or lost. HMRC's starting position for anyone with visible wealth is that the debt should be paid from assets, not from future income. Before it will grant time, it wants to know why realisable assets cannot be used. Credible answers exist and are accepted — but they must be evidenced, not asserted:

• The asset is a US retirement account and accessing it would trigger US income tax and, potentially, an additional tax on early distributions — converting a UK cash problem into a permanent US tax cost.
• The holding is subject to a lock-up, a shareholders' agreement, a blackout period or an insider-dealing restriction.
• Realising the asset now would itself trigger a further UK capital gains charge, increasing the total debt.
• The property is mortgaged, jointly owned, or already on the market with evidence of the process.
• A liquidity event is scheduled and documented, in which case a shorter arrangement with a defined lump-sum date is far more persuasive than a long flat schedule.

Practically, the strongest proposals we submit are written, not telephoned: a short covering analysis, a statement of income and expenditure, a schedule of assets with a note on why each is or is not realisable, the proposed instalment profile, and the funding evidence behind it. HMRC may also ask for security on larger arrangements, and may ask whether third-party or commercial borrowing has been explored — a question worth having a costed answer to, because in some cases borrowing at a commercial rate is genuinely cheaper than HMRC's late payment interest.

Duration and debt-size tiers

The unwritten baseline is twelve months. Arrangements running to 24 months are achievable with proper evidence; beyond that they become unusual and require a compelling, documented case. HMRC also escalates decision-making by size of debt — its internal guidance sets out distinct handling for larger bands, including a specific tier for debts of £250,000 and over. In practice this means a large catch-up balance is not decided by the first officer who answers the telephone, and a proposal drafted for a call-centre conversation will not survive the review it actually receives.

What happens to interest and penalties while the arrangement runs

The most damaging misunderstanding is that agreeing instalments freezes the position. It does not.

Interest continues to accrue daily on the outstanding balance for the whole term. HMRC's late payment interest rate is set by reference to the Bank of England base rate plus a margin — a margin that was increased with effect from April 2025, and which has left the headline rate in the region of 7.75% during 2026. The published series sits on the GOV.UK HMRC interest rates page. Spreading a £400,000 balance over 24 months at that rate is not free: the interest cost of the time itself runs to a substantial five-figure sum, and it is charged on penalties as well as on tax.

Late payment penalties: the 30-day, six-month and twelve-month points

Separately from interest, Self Assessment late payment penalties bite at 30 days, six months and twelve months after the due date, each commonly charged at 5% of the tax unpaid at that point. The critical mechanic for a catch-up is this: a Time to Pay arrangement agreed before a trigger date generally prevents the penalty that would otherwise arise at that date, but it does nothing about trigger dates that have already passed.

For returns that are years late, all three points have long since passed, and the associated penalties will already be in the balance you are negotiating over. For the most recent year in the catch-up — the one where the 31 January deadline may only just have gone by — timing genuinely matters, and a few weeks of delay in agreeing the arrangement can cost 5% of that year's tax.

Late filing penalties are a separate track

Late filing penalties run on their own escalator regardless of whether tax is owed: an initial fixed penalty, daily penalties after three months up to a capped total, and further tax-geared penalties at six and twelve months. Where a failure to notify is involved, behaviour-based penalties calculated as a percentage of the potential lost revenue can also apply, with the percentage depending on whether the failure is treated as non-deliberate, deliberate, or deliberate and concealed, and on whether the disclosure was prompted or unprompted. All of these are collectible debts that can sit inside a Time to Pay arrangement — but the argument that they should be reduced is a different conversation, run with a different part of HMRC, and it should be run before the balance is finalised.

Payments on account: the trap that breaks catch-up arrangements

This deserves its own heading because it defeats more arrangements than any affordability question.

Once your Self Assessment record shows a substantial income tax liability that was not collected at source, the payments on account regime engages. You become liable for two instalments towards the following year — commonly 50% of the prior year's liability each, due 31 January and 31 July. Those payments fall due after the arrangement begins, which means they sit outside it. Missing them is a default.

So a client who has carefully negotiated affordable monthly instalments on £350,000 of arrears can find that on the next 31 January they owe those instalments plus a payment on account of well over £100,000, and the arrangement collapses. The fix is to model total cash requirement — arrears schedule plus forward payments on account — before proposing anything, and where the income genuinely will not recur at the same level, to consider a formal claim to reduce payments on account, supported by evidence. Proposing a schedule that ignores the forward position is the fastest way to lose credibility with HMRC's Debt Management team.

How does a UK Time to Pay arrangement interact with a US filing in flight?

This is where generalist UK guidance stops and where the real money is made or lost. If you are a US person catching up in both jurisdictions — typically through the Streamlined Filing Compliance Procedures on the US side and late Self Assessment returns on the UK side — the two payment positions are not independent.

Foreign tax credit timing: cash basis versus the accrual election

The US allows a credit for foreign income taxes. The default for an individual using the cash method is that foreign tax is creditable in the year it is paid. Spread a UK balance across 24 monthly instalments and, on the cash method, you have spread the corresponding UK tax payments across two or three US calendar years — while the underlying income was reported in US years that are already closed or closing. The credit and the income fall out of alignment, and the practical result can be US tax paid on income that was fully taxed in the UK, with the credit stranded in a later year as an excess carryforward.

The mechanism that addresses this is the election to claim the credit on an accrual basis, made on Form 1116, which credits foreign taxes in the year they accrue rather than the year they are paid. Two points make this a decision to take deliberately and early: it is generally binding for all later years once made, and it applies to all creditable foreign taxes, not selectively. There is also a longer statute of limitations for refund claims relating to foreign tax credits than for ordinary claims, which sometimes allows a later corrective claim — but relying on it is a worse position than getting the basis right at the outset. See the IRS guidance on the foreign tax credit and the instructions to Form 1116.

The corollary is a genuine planning point: the shape of your UK instalment schedule has a US tax consequence. A schedule that clears more UK tax before a US year-end may be worth more than a marginally cheaper one that does not. That trade-off should be modelled before the arrangement is proposed, not discovered afterwards. Our cross-border tax planning work on catch-up cases routinely starts here.

Streamlined submissions are expected to be paid in full

A US catch-up under the Streamlined Foreign Offshore Procedures is submitted as a package: the delinquent returns, the amended returns, the FBARs and the non-wilfulness certification, together with the tax and interest due. The procedures contemplate payment with the submission. Instalment relief is not part of the streamlined package, and a submission filed without the payment it says is due invites questions about the completeness of the filing itself. If the US balance also cannot be paid at once, that is a separate IRS collection conversation, run through the IRS's own payment agreement process after the returns are filed — not a modification of the streamlined terms.

If you owe both revenue authorities

Feature	UK — HMRC Time to Pay	US — IRS payment agreement
Returns must be filed first	Yes — all outstanding returns	Yes — all required returns
Self-serve threshold	Broadly balances up to £30,000, within a short window of the due date	Long-term plans broadly up to $50,000 combined tax, penalties and interest; short-term plans below $100,000
Typical duration	12 months as the baseline; up to 24 with evidence	Short-term up to 180 days; long-term monthly instalments over a longer period
Set-up fee	None	Set-up fee applies to long-term plans, reduced for direct debit
Interest during the plan	Continues to accrue daily on tax and penalties	Continues to accrue on the unpaid balance
Penalties during the plan	Existing penalties stand; future trigger dates prevented if agreed in time	Failure-to-pay penalty continues, generally at a reduced rate while an agreement is in force
Affordability evidence	Detailed income, expenditure and asset review for large debts	Financial disclosure generally required above the streamlined thresholds
Effect on the other country	Timing of payment can determine the US credit year	US payment does not reduce the UK balance

Details of the US side are set out in the IRS online payment agreement guidance. The strategic point is sequencing: where treaty relief means one country's tax is ultimately creditable against the other's, paying the wrong balance first can permanently waste relief. Decide which liability is economically final and which is creditable before you commit cash to either.

Paying a UK balance from outside the UK

Time to Pay arrangements are normally collected by direct debit; HMRC has treated direct debit as the standard method for arrangements for many years, while accepting alternatives where a taxpayer genuinely cannot set one up. That is a real issue for a non-resident or recently departed client with no UK current account. Three practical points:

• Open or retain a UK account before you need it. Establishing UK banking as a non-resident after you have an HMRC debt is slow and occasionally impossible; doing it while the returns are being prepared is far easier.
• Agree the payment mechanism explicitly. If direct debit is not available, get HMRC's acceptance of the alternative recorded, and diarise each instalment. An international transfer that arrives two days late is treated the same as a missed payment.
• Price the currency risk. A GBP-denominated debt serviced from USD assets over 24 months carries real exchange exposure, and HMRC will not adjust the schedule because sterling moved. Where the amounts are significant, hedging or pre-funding a sterling balance is worth costing.

Being outside the UK is not a shelter, either. HMRC has enforcement routes, and the UK's treaty network — including the US-UK income tax treaty — contains provisions for mutual assistance between the authorities. Distance changes the mechanics of collection, not the existence of the debt.

What happens if HMRC refuses, or the arrangement fails?

If HMRC declines, it will ask for payment in full and the debt moves toward enforcement — which for an individual can include enforcement agents, attachment of a debt owed to you, a charging order over property, or in extreme cases bankruptcy proceedings. There is no tribunal appeal against a refusal to grant time, although the underlying liability and the penalties remain separately challengeable, and an unreasonable refusal is in principle amenable to judicial review. That is an expensive route and rarely the right first answer; a better-evidenced second proposal usually is.

If an agreed arrangement defaults — a missed instalment, a new debt, or a return filed late during the term — HMRC's standard response is to cancel it and treat the whole remaining balance as immediately due. Reinstatement is possible but you negotiate from a materially weaker position. Build headroom into the schedule rather than proposing the maximum you can theoretically afford in a good month.

One reassurance worth stating plainly: a Time to Pay arrangement is a confidential agreement with HMRC and is not reported to UK credit reference agencies. It is the enforcement steps that follow a failure — a county court judgment, for example — that create a public record. That asymmetry is a strong argument for engaging early rather than waiting to be chased.

A worked sequence for a five-year cross-border catch-up

1. Scope both jurisdictions together. Establish the UK years to be filed and the US position — delinquent returns, FBARs, information returns — before any filing is made anywhere.
2. Quantify the full UK balance: tax by year, interest to a projected payment date, and every penalty that is likely to be raised. Model it, do not wait for HMRC to tell you.
3. Model the US credit position under both the paid and accrued bases, and identify the instalment profile that preserves the most relief.
4. Decide the penalty strategy: whether reasonable excuse, special reduction or the unprompted-disclosure reduction is in play, and prepare that argument alongside the returns.
5. Prepare the funding evidence: income and expenditure, asset schedule with realisability notes, any liquidity event timetable, and the banking arrangements for payment.
6. File all UK years together and let them post to the Self Assessment record.
7. Submit a written Time to Pay proposal immediately, covering both the arrears schedule and how forward payments on account will be met.
8. Run the US filing to its own timetable, with the US payment funded separately, and diarise every UK instalment and every future UK due date for the life of the arrangement.

The mistakes we see most often

• Telephoning HMRC before the returns are filed, and being told to call back — having flagged the debt without any ability to settle its terms.
• Proposing a schedule that ignores the next payment on account, guaranteeing default within twelve months.
• Paying the IRS first because that submission felt more urgent, then discovering the UK tax was the creditable side of the pair.
• Letting the most recent year's 30-day penalty trigger date pass while the proposal is still being drafted.
• Treating penalty mitigation and payment negotiation as one conversation. They are handled by different HMRC teams and the arguments do not transfer.
• Understating expenditure in the affordability review to look conservative, then being held to a schedule that cannot be sustained.

For a fuller picture of how a two-jurisdiction catch-up is structured from the start, see our guides library and our work with high-net-worth individuals and internationally mobile families as US-UK tax accountants.

Speak to us before you file

The window in which a multi-year UK balance can be shaped — the penalty position, the instalment profile, and the US credit year the payments land in — closes the moment the returns are filed and the debt crystallises. Everything after that is administration. If you are preparing to bring several years of UK returns up to date, and a US filing is in flight or about to be, contact our cross-border team for a confidential consultation. We will quantify the whole position on both sides of the Atlantic, prepare the returns, and put a properly evidenced Time to Pay proposal in front of HMRC on the day the balance appears.