Hi all, I've been claiming tax credits (working and child) as a single person but I am going to be moving in with someone in Jan. I won't be eligible for any tax credits when that happens so I am worried that, because tax credits are worked out by tax year, they will look at my new much bigger joint income from Jan onwards and make me pay back everything I've received since April. Is this correct does anyone know? I can't afford to do that so I was wondering if I should wait till the end of the tax year either to a) move in together or, worse b) lie and say we only moved in together in April......