You must declare this income for tax purposes in Britain.
Times, Sunday Times (2010)
Definition of 'income'
income
(ɪnkʌm)Explore 'income' in the dictionary
variable noun
A person's or organization's income is the money that they earn or receive, as opposed to the money that they have to spend or pay out.
Definition of 'declare'
declare
(dɪkleəʳ)Explore 'declare' in the dictionary
verb
If you declare goods that you have bought in another country or money that you have earned, you say how much you have bought or earned so that you can pay tax on it.