Some taxpayers may have noticed changes to their digital tax coding notice when they log in to their accounts. HMRC began trialling the changes from mid-March and it will continue into June.
A number of customers were selected for the trial which is testing simplified language designed to help customers better understand changes to their tax code and clearly explain how a tax code change affects their take-home pay.
Only taxpayers with simple tax affairs were selected. Primarily, this included individuals:
- With a single live employment or occupational pension at the time of logging into the PAYE service.
- With no special code (e.g. BR, D0, CD1) as either their previous or new code.
- With at least one change to their coding components.
- Whose tax code must be calculated more than 31 days after the customer’s first date of employment.
- Whose tax code change does not relate to a change in country of residence unless tax code prefix changes from ‘CK’ to ‘no prefix’ and vice versa, or from ‘K’ to ‘C’ and vice versa.
The trial also improves the information provided about tax codes and an explanation of each coding item.
If customers notice incorrect information in their tax code notice, they can update details such as estimated pay in both the HMRC app or their online account.
Useful guides on this topic
Tax Data Card 2026-27
A summary of key tax rates and allowances for 2026-27 and 2025-26.
Finance Acts 2026-27: tax update and Rolling Tax Planner
This rolling planner tracks the key tax announcements that impact the 2026-27 tax year and beyond. This planner is updated on an ongoing basis.
External links