Should I pay off my loan first or invest in ETFs? Millions ask this question. The answer is simpler than you think — and it is purely mathematical.

The Golden Rule

If loan interest is higher than your expected return → pay off loan first.

If expected return is higher than loan interest → invest.

Example

Consumer loan at 8% → Pay off immediately. No investment delivers 8% risk-free.
Car loan at 4.5% → Prefer paying off. ETFs deliver ~8% long-term, but with risk.
Mortgage at 1.5% (old) → Invest. Even a savings account yields more than 1.5%.
Student loan at 0% → Definitely invest.

The Exceptions

Psychological Factor

Some people sleep better without debt — even when math says invest. If debt stresses you, pay it off.

Overdraft

Overdraft rates of 10-15% are a financial emergency. Stop all investments and pay off immediately.

Credit Card Debt

15-20% effective annual rate. Highest priority. Before emergency fund, before investments, before everything.

The Hybrid Strategy

70% of savings rate: Debt repayment
30% of savings rate: Start ETF savings plan

This way you reduce debt AND benefit from compound interest.

Debt Types by Priority

Pay off immediately: Credit cards, overdraft (10-20%)
Pay off quickly: Consumer loans, car loans (4-8%)
Normal repayment: Mortgages with medium rate (2-4%)
Slow repayment: Mortgages with low rate (under 2%)
Do not prepay: Interest-free student loans, 0% financing

Bottom Line: Paying off debt IS an investment — with guaranteed return equal to the loan interest rate. Paying off a 5% loan is like a risk-free 5% investment. Better than most investments.