those that report each fortnight are reporting exact income for parenting payment hun - they still have an estimate on the system for ftb as well - but they wouldn't change that one very often.

if you're nudging close to your estimated income, change it NOW - the last thing you want to do is go over. if you are receiving both a and b for ftb, and you underestimate the lower income, you can be overpaid as much as 40c for every dollar you underestimate (20c part a for every dollar, 20c part b) - so you need to estimate

assume your good weeks will be your every week - and estimate accordingly. if you have a few bad weeks early in the year, you can drop it again but you don't want to assume they'll be crummy and end up with good weeks - and then end up with a nasty debt