Money decision lab
Pay off debt, or start investing?
You have a steady surplus each month and some debt at a moderate interest rate. You are also curious about investing. Where would the surplus go?
Free — no account needed to read
You have a steady surplus each month and some debt at a moderate interest rate. You are also curious about investing. Where would the surplus go?
What matters here
- Interest rate on the debt
- Emergency fund
- Time horizon
- Risk
- How the debt feels
Ways people reason about it
None of these is marked correct.
Debt first
Repaying debt gives a certain saving equal to its interest rate, while investment returns are uncertain.
Fits when: The debt rate is high or the debt weighs on you.
Split the surplus
Some people pay extra on debt and invest a little, to build both habits at once.
Fits when: The debt rate is moderate and you have a buffer.
Buffer before both
Without an emergency fund, any surprise would push you back into borrowing, undoing progress on either path.
Fits when: You have little set aside for emergencies.
What would change the answer
- The exact interest rate.
- Whether you have an emergency fund.
- When you would need invested money back.
Lessons behind this
- Repayment strategies and refinancing — Snowball, avalanche and the basic idea of refinancing — and how to choose. (8 min · Practical)
- What investing is, and why people do it — Putting money to work in the hope of growth — and how that differs from saving. (6 min · Foundation)
- Risk, return and volatility — Higher possible returns usually come with bigger swings and bigger chances of loss. (7 min · Foundation)
- Emergency funds and buffers — Money set aside for surprises turns a crisis into an inconvenience. (7 min · Foundation)