Pension pot on self assessment

Hi I withdrew a small pension of £3200 I paid 20% tax the pension company sent me a P45 because I'm a 40% tax payer. Where do I include this on my self assessment form to pay the extra tax Thanks

Hi Steve Hope,
You would enter this on the paper tax return (SA100) in box 11 (pension) and 12 (tax) of page TR3.
When tailoring your return online, on page 2, tick 'yes' to 'Did you receive any UK pensions, annuities or state benefits'.
This will then allow you to declare your pension.
Thank you.