pay back

Instead, when the mortgage is refinanced or the house is sold, the borrower pays back the original loan, plus 20% of its increase in value.

The idea is that borrowers are more likely to pay back — and less likely to default on — a loan attached to the home they actually live in.

"I think of it as paying back a little bit. I was helped out quite a lot," he added.

Governments borrow money from investors by selling bonds - which is a loan the government promises to pay back at the end of an agreed time.

Hundreds of thousands of Australians forced to pay back welfare debts created by an illegal automated system have won the largest payout in the country's history.