If you get universal credit, all your income is disregarded.
HB Regs, Sch 4 , para 12 & Sch 5 , para 4

Otherwise, all your income is considered, including earnings, benefits and pensions. However, some income may then be disregarded, partially or fully. In 4 to 6 below, we outline how earnings are assessed and how much is disregarded; in 7 to 19, we describe how other income is treated.

In some cases you can be treated as possessing income or earnings that you don’t actually have (see 20 and 21 below).