Hi Lisa,
If you invest in deeply discounted securities, put the difference between what you paid for the bond and what you redeem or sell it for in box 3 of SA101 (page Ai1).
The SA101 guidance notes advise:-
Box 1 Gilt etc interest after tax taken off . Put the total amount of interest received from your gilt-edged and accrued income securities with tax taken off in box 1.
If the interest did not have tax taken off, put this amount in box 3.
Do not fill in boxes 1 and 2.
Box 2 Tax taken off put the tax taken off the interest in box 2.
Box 3 Gross amount before tax Add together boxes 1 and 2 and put the total figure in box 3.
Make sure you include any deeply discounted securities you redeem or sell.
There is no mention of commission fees or interest, so these should not be include.
(
Additional information notes Tax year 6 April 2023 to 5 April 2024 (2023–24) Use these notes to help you fill in the Additional information pages of your tax return).
Thank you.