This story is part of CNBC Make It's Millennial Money series, which profiles people around the world and details how they earn, spend and save their money.

In January 2020, Marek and Kothney-Issa Bush, both 28, had a lot going for them: The couple started the year completely debt-free, having paid off the last of their $125,000 debt in 2019. They earned a combined income of $56,000 and had settled into life in a tiny home community in Lake Dallas, Texas.