Hi,
You should submit under self employment.
There is a box in the self employment section of SA104F of the full self employment suplementary page SA104.
On page SEF5, box 82 "Other tax taken off trading income" you would enter the tax deducted on your behalf, so that this sum can be factored into your tax calculation.
SA103F Self-employment (full) 2024.
If completing your tax return online, you will need to tick the option to state your income was over £85000, so that the full self employment version is available, which is
where you will find the tax box.
Thank you.