During that time, they also paid off Brennan's $38,500 in student loans, two cars, an engagement ring, and a bed.
Brennan graduated from college in 2014 with a finance degree, a couple of major expenses, and no immediate income.
Here's how the couple paid off their six-figure debt and plan to hit a net worth of $1 million in 2022.
In June 2021, one of their highest-earning months with Budgetdog, they threw an extra $30,000 at the mortgage, Brennan said.
"September was the first month that we didn't have a mortgage and we saved 75% of our income," said Brennan.