The FIRE movement says invest 30–40% of your income. Ramsey says 15%. George and Jade break down why: 15% of gross income is enough to retire with dignity while still funding college for kids, paying off the mortgage early, giving, and living your life. It's calculated on gross household income, the employer match doesn't count, and the order is 401(k) to the match, then Roth IRA, then back to the 401(k).