1. Reconcile the bill before proposing a repayment
Obtain the return calculation and HMRC statement. Separate the balancing liability, payments on account, earlier arrears, interest and any penalties. Match payments already made to their dates and references.
A January demand can include an advance payment for the following year. Read our payments-on-account guide before assuming the whole amount is tax on the completed year. Affordability alone is not a reason to reduce payments on account; review any reduction against the expected liability.
2. Build a realistic affordability schedule
List regular income, essential household costs, other fixed commitments, savings, investments and debts. Show irregular earnings by month rather than assuming a recent good month will repeat. Separate business receipts from the cash actually available for personal tax.
For illustration, monthly income of £3,200 less £2,700 of listed outgoings leaves £500 before reviewing irregular costs and future tax. That arithmetic does not establish that HMRC will accept a £500 instalment. Keep the evidence and assumptions with the schedule.
3. Distinguish advance saving from arrears arrangements
A Budget Payment Plan allows weekly or monthly Direct Debit payments towards the next Self Assessment bill, provided earlier Self Assessment payments are up to date. It reduces the amount left at the deadline; any remaining balance still needs paying.
This differs from a Time to Pay arrangement for payment difficulties. HMRC provides an online eligibility service and a contact route where an online arrangement cannot be made. Check the current service for your circumstances rather than assuming a particular debt amount automatically qualifies.
4. Prepare for HMRC’s questions
Have the relevant tax reference, UK bank details and income-and-spending information ready. HMRC may ask what can be paid immediately, the proposed monthly amount, other taxes due and available savings or assets.
HMRC assesses affordability and expects available assets to be considered. Its guidance describes repayments in relation to disposable income, with the duration depending on the debt and circumstances. Agreement is not guaranteed. Keep the agreed terms, payment references and contact records.
5. Keep new liabilities in the forecast
Include future payments on account and the next return in your cash forecast. A proposal that pays old debt but leaves no provision for new tax may be unsustainable. Contact HMRC if circumstances change or another bill cannot be paid.
Interest can increase the overall cost, so do not treat instalments as interest-free finance. A payment discussion does not replace completing an outstanding return or correcting omitted income. See our earlier-year income guide where relevant.
Agree the return and payment-support scope
Tell us the filing position, approximate balance, deadline and whether HMRC has contacted you. We can agree preparation or review of the tax calculation and any separate payment-support work. HMRC decides whether to accept an arrangement.
Personal tax services start from £400. UA Tax supports London and UK-wide clients. Get in touch for a scoped quote. Keep banking details out of an initial website message.
For advice on your own circumstances, see our Self Assessment payment preparation service and agree the scope before acting.
Official sources and further reading
These primary sources support the framework above. Check the current version before acting because tax law and HMRC guidance can change.