Should You Pay Off Debt or Invest? The Real Answer
The debt vs investing debate depends on interest rates, risk tolerance, and personal psychology. Here is a clear framework to make the right decision.
The mathematically optimal choice between paying off debt and investing depends on whether your expected investment return exceeds your debt interest rate. But psychology, risk, and life circumstances matter too.
The Interest Rate Framework
- Debt above 10% APR (credit cards, payday loans): pay off first — guaranteed return
- Debt 7–10% (personal loans, some car finance): generally pay off before investing
- Debt 4–7% (student loans, some mortgages): split: invest and pay off simultaneously
- Debt below 4% (low-rate mortgage, 0% car deals): usually worth investing instead
- Employer pension match: always capture first — 50–100% immediate return beats any debt
The Psychological Factor
If debt causes you stress or sleep problems, the psychological value of paying it off exceeds the mathematical calculation. Conversely, if you are comfortable with uncertainty, investing while carrying low-rate debt makes sense. There is no single right answer — but there is a right answer for your specific situation.
The Hybrid Approach
- Pay minimum payments on low-rate debt
- Invest in employer match first — free money never passed up
- Build £1,000 emergency fund to prevent new debt
- Then split surplus: 60% to debt, 40% to investments (or reverse for low rates)
- Review annually as debt balances and investment performance change