Should You Pay Off Debt or Invest?
The Math
The stock market has historically returned about 7% annually after inflation (10% nominal, ~7% real). This gives us a benchmark:
| Debt Interest Rate | Strategy |
|---|---|
| Above 8% (credit cards, personal loans) | Pay off aggressively — the math is clear |
| 6–8% (private student loans, some car loans) | Lean toward paying off |
| 5–6% | Toss-up — either is reasonable |
| 3–5% (federal student loans, some mortgages) | Lean toward investing |
| Below 3% (low-rate mortgages, some car loans) | Invest — paying off early has little benefit |
The Guaranteed Return Argument
Paying off a 7% loan gives you a guaranteed 7% return — the interest you no longer pay. Investing in the stock market might return 7%, or it might return 0% or -20% in a given year.
For risk-averse people, the guaranteed return of debt payoff is often worth more than the expected-but-uncertain return of investing. This is a perfectly rational preference.
Always Get the Employer Match First
Before doing anything else, contribute to your 401(k) up to the full employer match. If your employer matches 50% of contributions up to 6% of salary, that's a 50% instant return on those dollars. No debt payoff comes close to that.
Order of operations:
- 401(k) contributions to get full employer match
- Build starter emergency fund ($1,000)
- Pay off high-interest debt (above ~7%)
- Build full emergency fund (3-6 months)
- Max out 401(k) and Roth IRA
- Invest remaining amount
The Emotional Factor
For many people, debt feels like a weight — psychologically draining, stressful, constraining. If carrying debt affects your wellbeing or decision-making, paying it off earlier than the math suggests is a completely valid choice.
Peace of mind has real value. Being debt-free lets you take more risk elsewhere (career changes, starting a business, investing more aggressively) because you don't have fixed obligations.
Multiple Debts: The Priority Stack
If you have several debts:
- Credit cards (15-25%) — pay off ASAP, minimum payments are dangerous
- Personal loans (8-15%) — pay off quickly
- Private student loans (6-10%) — pay aggressively
- Federal student loans (4-7%) — it depends; income-driven repayment may change the math
- Car loans (4-7%) — moderate priority
- Mortgage (3-7%) — usually fine to just make regular payments and invest instead
What About Tax-Deductible Debt?
Mortgage interest can sometimes be deducted (if you itemize). This reduces the effective interest rate. A 6% mortgage with a 22% marginal tax rate has an effective rate closer to 4.7%. This makes investing more appealing relative to early payoff.
FAQ
I have $10,000 in savings and $10,000 in credit card debt. Should I pay it off at once?
Probably yes. Credit card debt at 20%+ is almost certainly costing you more than you're earning in savings interest. But maintain a small emergency fund ($1,000-$2,000) before paying off the remaining balance.
What about 0% APR credit card offers?
0% APR is a genuine 0% interest rate for the promotional period. Pay the minimum and invest the rest — but have a plan to pay it off before the rate jumps.
→ Debt — Understanding debt types and payoff strategies → Priority Ladder — The right order for all financial decisions → Investing — How investing works once you're ready