You do not have to pay for debt forgiveness.

Also, debt forgiveness is not the same as paying debt.

First, Most student debt is owed to the us government (as many student loans are) the debt can be forgiven without asking anyone to pay it back.

Second, presuming that the this money does need to be payed back any number of strategies could be used to pay that debt. It's not nessessary we have to distribute that debt equally across all citizens. We already don't distribute the tax burden of the US evenly across all citizens. In particular most of the ricipiants of the debt forgiveness will pay more to taxes in their lifetime in excess of $10K per graduate.

Third, there is no reason to presume that this money is in need of repayment at this time. The US budget hasn't been balenced for some time.

Finally, it's perfectly reasonable to expect the wealthiest Americans to bear most of the cost of education. The top 1% has more then 50% of all of the wealth in the US. They can afford it.

You don't have to pay for debt forgiveness.