My partner's income for 19/20 was 24k. Due to a job change his income for 20/21 will be 19.5k. Due to the disregard it appears they will calculate our income (he is the only one working) as 22k. If they based it on his actually wage we would get £800 a year more in tax credits. Will we get that back of the end of the 21/22 tax year or will they just say that he has the 22k income when he doesn't in reality?