Was on mat leave last year, I always overestimate my salary (variable bonuses) slightly to avoid overpayment. I only get SMP so big drop in salary and received working tax too due to this. Renewed and a week later rememberer the first £100 of SMP disregard and rang to therefore change annual salary to deduct £3400 from p60 figure. I was hoping for a payment once they'd adjusted it but that was in May and nothing. Have I missed another change in the way it works? I'm due to make a change when childcare goes down instep rember when dc2 starts school