It WILL catch up with him. It took 8years for CS to get a cent out of my ex after he didn't lodge a tax thing for 7years. CS even called me to tell me he wont pay so why don't I just drop it. They called another time to say he is voluntarily going to give me $50 a month and suggested I take the $50 monthly as its better then nothing and to drop the arrears (his assessment at the time was around $500 a month) He wont get away with it even if it takes 20years to get a cent. If he dies its still a debt so you would then be entitled to super etc. Just hang in there and one day you will get what your entitled to to support your children xx