MYEFO estimates student loans will increase from $42.4 billion in 2016 to $59.6 billion in 2019.
The government hasn't announced the details for its plans to partially deregulate university fees, and because the changes aren't due until 2018 there are no clues in MYEFO.
But we do get a better picture of the size of student loan debt.
In June 2015 there were more than 2.2 million Australians with student debt owed to the government.
As of June 30, 2017, the government estimates the total student loan debt will be $42.5 billion, and will increase over the next four years.
Interestingly, they note the average time taken to repay HELP debts is 8.7 years.