Being an early retiree means keeping a close eye on your spending. For Steve Adcock, 39, and his wife Courtney, 36, who have been retired since 2016, being financially savvy is especially important because they haven't added a penny to their investments since they left their jobs.

The couple, whose net worth sits around $1.2 million, have the majority of their investments in targeted retirement funds. But they keep their spending money in a high-yield savings account. The account has at least two years' worth of expenses at all times, which in the past few years has ranged from $60,000 to $80,000.