Can I Pay Self Assessment Tax Through PAYE in 2026/27? | Expert Guide

HMRC allows many taxpayers to collect their Self Assessment tax bill through their PAYE tax code. This process, known as “coding out,” spreads the tax you owe over 12 months rather than requiring a single lump sum payment by 31 January.

However, strict eligibility criteria apply for the 2026/27 tax year. We explore the legal thresholds, filing deadlines, and specific exclusions that determine whether HMRC can automatically transfer your balancing payment to PAYE.

The General Rule: £3,000 Eligibility Threshold

Under regulation 186 of the Income Tax (PAYE) Regulations 2003, HMRC can adjust your tax code for a subsequent tax year to recover a Self Assessment balancing payment.

(3) The Inland Revenue must have regard to the difference in determining a taxpayer’s code for a subsequent tax year under regulation 14 (matters relevant to determination of code) if— (a)it is less than £3,000

This means your balancing payment (including any outstanding payments on account) must be strictly £2,999.99 or less for an automatic transfer to PAYE.  If the liability equals or exceeds £3,000, you cannot automatically pay your Self Assessment tax through PAYE.

Strict Deadlines for Coding Out

To rely on this mechanism, you must submit your tax return by specific statutory deadlines. Under regulation 186(3)(b) of the PAYE Regulations 2003, the return must be:

• delivered electronically before 31 December following the end of the tax year; or
• delivered by paper before 1 November following the end of the tax year.

If you file early but leave a payment on account unpaid, HMRC will assess the total debt at the time of capture.  If your unpaid payment on account pushes the total balance to £3,000 or more, the system will not automatically code it out, and you must manually request a restriction to your PAYE code.

Regulation 14D: The Sliding Scale for Debt Collection

When HMRC determines a code to recover a debt under regulation 14D, it applies a sliding scale based on the taxpayer’s expected PAYE income.  While the taxpayer-initiated coding out for Self Assessment balancing payments is generally capped at £3,000, HMRC’s overall debt recovery limit scales up for higher earners.

For example, if your expected PAYE income is less than £30,000, HMRC can recover a maximum of £3,000.  If you earn £90,000 or more, the total amount of debt HMRC can recover through your tax code increases to a maximum of £17,000.  However, this sliding scale primarily applies to “relevant debts” (like underpayments found by HMRC), whereas standard Self Assessment coding out remains strictly subject to the £3,000 cap.

Exclusions: When Can You Not Pay Through PAYE?

HMRC’s Self Assessment Manual outlines several exclusions where automatic transfer to PAYE will not occur.  These include:

• Taxpayer Election: The taxpayer explicitly requests on their return not to code the amount out, or objects to it.
• No PAYE Source: The return lacks Employment pages, Minister of Religion pages, or entries for non-State pensions or Taxable Incapacity Benefit, meaning no active PAYE link exists.
• Class 2 NICs: Class 2 National Insurance Contributions are excluded from the coding out process.
• Outstanding Disputes: There is a formal or informal stoodover amount or remitted amount for that tax year.

Context for 2026/27: HICBC and CGT Changes

For the 2026/27 tax year, two major tax updates may impact whether you fall within the Self Assessment regime and whether your debt remains under the £3,000 threshold.

First, the High Income Child Benefit Charge (HICBC) threshold increased to £60,000 in April 2024, with the charge fully applying at £80,000.  Individuals earning between £60,000 and £80,000 must report the charge via Self Assessment. If the resulting tax charge is below £3,000, they can opt to pay it through their PAYE code, provided they file their electronic return before 30 December.

Second, Capital Gains Tax (CGT) rates have increased. Following the Autumn Budget 2024, the lower rate increased from 10% to 18%, and the higher rate increased from 20% to 24%.  These higher rates may push an individual’s total Self Assessment liability over the £3,000 limit, rendering them ineligible for the PAYE coding out mechanism and requiring a direct payment.

Summary Table

Next steps: Review your client’s total 2026/27 Self Assessment liability to ensure it falls below the £3,000 threshold, and confirm their online return is filed before 30 December to utilise the PAYE coding out facility.