ok ftb - it's a family payment, so only one of you can claim
ftba has income threshold around 101k combined for both you and hubby, then you get nothing
ftbb has to have higher income on less than 150k, and is then based on lower income earner - if you, as lower income earner, are under about 24k for the year, you may get something. the thresholds this year are different to what they were the previous two years - so your estimate will be a bit out


ccb - benefit - is income based - it's payable up until your combined income is about 138k this year (would have been less in previous years) - based on income, you get a percentage of the basic rate (at the moment it's 3.78, less in previous years) per hour. ccb is paid at that amount and then you pay the difference. everyone is entitled to 24 hours of child care benefit per week (no activity test) - if you meet the work study training test for at least 15 hours per week though, you may be entitled to 50 hours (and in some cases more than that). if your income is over the income threshold (around 138k this year) you would qualify for ccb at zero percent

ccr (rebate) is not income tested - but IS activity tested. you have to be meeting the work study training test for at least 1 hour per week to qualify for the rebate. the number of hours you qualify for relates directly to the number of hours of ccb you qualify for. ccr is half of your out of pocket costs after ccb has been calculated - it is capped (7500 maximum per child per year) - there are several ways to have it paid, but given you're looking at previous years, i won't go into that!

if you're doing a lump sum claim for previous years, you'll need to make sure your child care centre have your crn and your DS' crn so that they can submit usage

when you do your lump sum, they'll likely send you a letter saying it's been processed but can't be paid at this time - this is generally because they need additional information (child care usage) and confirmation of income (direct from ATO) so it can take a while after FAO process things

hope that helps!