I stopped by my local centrelink office on a whim while down the street today and found out that the limit for a LIC with one child is approximately $6,200 over 8 weeks. DF and I are going to go through all of his payslips (we overestimated for the FTB in case he had a week where he earned more than normal, which happens occasionally) and figure out exactly how much he gets over 8 weeks.

Thanks for all your help BG