Your medical expenses will most likely be added to your DH's return as the medical expenses offset is for combined family expenses. If you aren't paying any tax, you don't get anything back for medical expenses, so better off in your DH's return anyway. Your accountant should be able to sort all that out for you. As far as Centrelink goes, I *believe* that they don't do anything until both of your returns are lodged. Someone else may be able to confirm this!