Split tax credits

My husband & I are jointly assessed for tax with Revenue. Up until recently my husband was on two payrolls and we split out the credits between 3 employers (including mine). Now he is employed by only one employer but we have not amended the credits. He has rec'd a P45 from the previous employer and my question is if he sends that to Revenue will they automatically move those credits to his current employer or can we leave things as they are and expect a return from Revenue on request of a P21? Thanks in advance

Yes Revenue will move his tax credits to the existing employer if you send in the P45

Thanks for your reply. Do you know would there be any problems if we did not send p45? Just pay more tax than what's due to receive an overpayment at year end?