if he has bubs less than a certain amount of time, you don't have to pay him anything

essentially they look at how much time you both have the child - if you have them more than 86%, you're considered to have them all the time, there is no obligation for you to pay to him, and due to his minimal income, none for him to pay to you. you get full FTBA in lieu of child support. if the percentage of care is between 14 and 35%, the calculations get much more complex - but you don't have that division of care, so it's not a drama. ring up, get the assessment in place - all it's going to do is stop you losing any ftba for not meeting the governments obligation to attempt to collect child supprt