https://help.gosimpletax.com/hc/en-gb/articles/360001684839-How-do-I-add-my-P11d-details-

https://help.gosimpletax.com/hc/en-gb/articles/360001684839-How-do-I-add-my-P11d-details-

On the Employment page, click on + INCOME Select Other Benefits P11D Enter the Income Details      Click SAVE