In that case, should I add my wife's and my allowance together, add 10% then deduct that from the actual joint salary we received in the relevant month.with the balance split 50/50 ?

Thanks for all the responses
The extra payment is a 3 month bonus. can this be spread over a 3 month period ? i.e My monthly salary plus 10% x 3 deducted from the bonus before 50% is sent

Hi Its clear that when one income is over 10% higher than expected you can keep the 1st 10% then share the rest 50 / 50 however is this taken as a joint income when you have a joint IVA ? My partners income is down by approx 3% however mine is up by 12%, overall 9%up. Will I be penalised for this. C...