We do a lump sum payment at the end of the financial year, once DH's tax return is complete.

This year we moved to fortnightly payments and they based what we are getting on a yearly income estimate. I'm now working on the books for the business, previously I worked without pay and everything went through him. Centrelink keep a certain amount held in case you end up being overpaid and from what I understand, if your estimation is correct, you get a balloon payment at the end of the financial year.