Why the ATO might hold your super
You have unclaimed super
Unclaimed super is money that a super fund is required to transfer to the ATO.
This might happen if your super becomes ‘lost'. Super might be ‘lost’ if your fund can’t contact you because you changed your contact details and haven't updated them, or your account hasn't received a contribution or rollover for five years. Sometimes, a lost account might be transferred to the ATO as unclaimed super at a later date.
Another reason is if you have an inactive low-balance account. Generally, this is an account with less than $6,000 that has not received a contribution or rollover for 16 months.
Your employer hasn’t paid your super correctly
If your employer doesn’t pay you the right amount of super (or they do it late), they must pay that amount to the ATO. But they only do this if you don’t have an active account.
You don’t have an active account for government contributions
The government might help boost your super if you earn a certain amount of income and make a contribution. But if you have an inactive account, then the government contribution could go to the ATO.