Currently DH and I both work full time, me on a fairly decent salary and him on a much lower one. Our outgoings (mainly rent) are high but we manage ok, particularly as I do a fair amount of overtime which pays for our 'extras' - days out etc. However DH hasn't been able to work his full hours recently due to health issues and while he had been still getting his full pay for now, this is likely to end soon. I've therefore done a rough calculation on entitledto and it seems we would be able to claim about £350/month in universal credit when his salary drops (we'd be entitled to a small amount now but currently don't claim).
My question is, I understand that they look at your actual income each month to see how much UC to pay you the following month, but how does this work in a couple? Do we claim in his name or mine, and if in his name, do they automatically look at how much overtime I've done and adjust it automatically or do we need to inform them? If it makes a difference, for payroll purposes my overtime pay is effectively a second job even though it is with the same employer so it gets paid through a different payroll number and I get taxed at basic rate on the whole amount. Also, how much would his UC be reduced by for each £ that I earn in overtime?