HMRC Time to Pay planner

This tool assumes:

• Self-serve online Time to Pay is available for Self Assessment debts up to £30,000 and within 60 days of the payment deadline, for up to 12 monthly instalments.
• Larger or longer plans require phoning HMRC and providing a budget; HMRC may agree up to 60 months in hardship cases.
• HMRC late-payment interest is set at Bank of England base rate + 2.5% — currently 7.75% from 9 January 2026.
• Interest accrues from the original due date until the balance is cleared, even under an agreed TTP.
• Missing a TTP instalment can collapse the arrangement and trigger enforcement; payment must be by Direct Debit.

Primary sources:

• HMRC: If you cannot pay your tax bill on time
• HMRC: Interest rates for late and early payments
• GOV.UK: Pay your Self Assessment tax bill