Section 15 Income and capital
In this Act “income” means income of any of the following descriptions—
earnings;
working tax credit;
retirement pension income;
income from annuity contracts (other than retirement pension income);
prescribed social security benefits (other than retirement pension income and state pension credit);
foreign social security benefits of any prescribed description;
a war disablement pension or war widow's or widower's pension;
a foreign war disablement pension or foreign war widow's or widower's pension;
income from capital;
income of any prescribed description.
Regulations may provide that a person's capital shall be deemed to yield him income at a prescribed rate.
Income and capital shall be calculated or estimated in such manner as may be prescribed.
A person's income in respect of any period shall be calculated in accordance with prescribed rules.
The rules may provide for the calculation to be made by reference to an average over a period (which need not consist of or include the whole or any part of the period concerned).
Circumstances may be prescribed in which—
a person is treated as possessing capital or income which he does not possess;
capital or income which a person does possess is to be disregarded;
income is to be treated as capital; or
capital is to be treated as income.