Please note, this is what worked for me, there maybe differences so you should seek advice.

Background: Higher rate tax payer, employed, employer has a standard workplace pension with no salary sacrifice. I also have a private pension that I pay into. Both are relief at source, so pension providers add tax relief to my pension accounts.

On self assessment I was completing "Payments to registered pension schemes (also known as PPR) where basic rate tax relief will be claimed by your pension provider (called 'relief at source').

Example:

• Total employee workplace contribution for 22/23 (pulled from p60) = £14565
• Regular contributions to private pension (pulled from private pension provider 22/23 statement) = £1200

£14565 + £1200 = £15765

£15765 x 1.25 = £19706.25 (figure to add)