Pay Off High-Interest Debt Before You Start Investing

If you have credit card debt at eighteen percent interest and you are putting money into an index fund that returns eight percent, you are losing ten percent on every dollar by investing instead of paying off the debt. High-interest debt is a guaranteed negative return, and no investment can reliably beat it. The math is straightforward, yet many people invest while carrying expensive debt because investing feels productive and debt repayment feels like standing still.

The exception is employer-matched retirement contributions — that is free money you should almost always capture. But beyond that match, every spare dollar should attack your highest-interest debt first. Once the expensive debt is gone, the money you were using for payments becomes available for investing, and now it compounds in your favor instead of against you. Eliminating high-interest debt is the safest and highest-returning financial move most people can make.