Should I build an emergency fund, pay off debt, or invest first?

Do them in layers rather than choosing just one. First, build a small starter cushion — around $1,000 or one month of essentials — so a surprise doesn't push you deeper into debt. Next, aggressively pay off high-interest debt like credit cards, where the guaranteed "return" of eliminating 20%+ interest beats almost anything investing can offer. While doing that, capture any employer 401(k) match, since that's free money you shouldn't skip. After high-interest debt is gone, finish a full 3–6 month emergency fund and then ramp up investing for long-term goals. Low-interest debt like a mortgage usually runs alongside investing rather than blocking it. The right sequence depends on your interest rates and risk tolerance. Compare the trade-offs for your numbers at wealthserene.com/tools/debt-payoff.