Paying off a debt earns a guaranteed, tax-free return equal to its interest rate. Investing earns an uncertain return. So pay off high-interest debt first — credit cards around 22% beat any realistic investment. Low-rate debt, such as a 3% mortgage, can usually wait while you invest. In the middle, around 6–8%, the choice depends on your risk tolerance, taxes and time horizon. Before either, keep an emergency fund and take any employer retirement match.
The rule in one line
Paying off a debt is an investment with a guaranteed return equal to its interest rate.
If your credit card charges 22%, every dollar you pay toward it "earns" 22% — with no risk, no taxes and no market timing. No investment reliably beats that. If your mortgage charges 3%, paying it early earns 3%, which most long-term investments have historically exceeded.
The numbers in 2026
- Credit cards: 22.36% on accounts that pay interest, the Federal Reserve's figure for August 2026.
- New 30-year fixed mortgages: 7.32%, the Freddie Mac average on October 22, 2026. Many existing mortgages were taken at 3–4%.
- US stocks: the S&P 500 returned about 10% a year on average from 1928 to 2025 with dividends reinvested, before inflation and taxes — with losses in roughly one year out of four.
The gap between a guaranteed 22% and an average 10% is enormous. The gap between a guaranteed 7.3% and an uncertain 10% is not.
The order of priorities
- Make every minimum payment. Missed payments cost fees, higher rates and credit damage.
- Build a starter emergency fund. Without cash, the next surprise goes back on the credit card.
- Take the full employer retirement match. A 50% or 100% match is an instant return no debt payoff can beat.
- Pay off high-interest debt: credit cards, personal loans, anything above roughly 8–10%.
- Finish the emergency fund: three to six months of expenses.
- Decide on moderate-rate debt (about 5–8%) — see below.
- Invest, and pay low-rate debt on schedule.
Example: $10,000 for one year
| Option | What you get in a year | Guaranteed? |
|---|---|---|
| Pay off a credit card at 22.36% | $2,236 of interest avoided | Yes |
| Pay down a mortgage at 7.32% | $732 of interest avoided | Yes |
| Pay down a mortgage at 3% | $300 of interest avoided | Yes |
| Invest in a stock index fund | about $1,000 in an average year, before taxes | No — it can lose money |
Example: $500 a month extra on a mortgage
On a $300,000, 30-year mortgage at 7.32%, the regular payment is about $2,061. Adding $500 every month pays the loan off in about 17 years instead of 30 and saves about $214,000 in interest.
On the same loan at 3%, the same $500 a month saves about $64,000 and pays it off about 11.5 years early — a much smaller prize for the same discipline. That is why the rate on your loan, not the idea of being debt-free, should drive the decision.
The middle ground: 5–8% debt
When the rate is close to what investments might earn, other factors decide:
- Risk: paying debt is certain; markets are not. If a 20% drop in your portfolio would keep you up at night, paying down debt is a legitimate choice.
- Taxes: deductible interest (for some mortgages or student loans) lowers the real rate; investment gains in a taxable account are taxed.
- Liquidity: money paid into a mortgage is locked in the house. Money in an index fund can be sold in days.
- Time horizon: the longer you can leave money invested, the more likely it is to beat a moderate rate.
Splitting is perfectly reasonable: for example, half of the extra money to the loan and half to investments.
Common mistakes
- Investing while carrying card balances. The card's rate almost always wins.
- Emptying savings to pay off a loan. Without a cushion, new debt follows the first emergency.
- Skipping the employer match to pay debt faster. Free money first.
- Paying off a 3% loan early while holding cash that earns almost nothing. Look at both sides of the balance sheet.
- Comparing with the best year of the market. Compare with a realistic average after taxes and with the chance of losses.
How to do it in AOS
When to revisit
Revisit the decision when rates change, when a high-interest balance is gone, when you refinance, or when your income or job security changes. The right answer at a 22% card rate is not the right answer at a 3% mortgage.
FAQ
Should I pay off my mortgage early?
If the rate is low (around 3–4%), most people are better off investing the extra money while keeping liquidity. At today's 7%+ rates, extra payments become a strong, guaranteed return — especially if you are risk-averse or close to retirement.
Should I stop retirement contributions to pay off debt?
Not below the employer match. Above the match, pausing contributions to clear credit card debt quickly is often reasonable.
Is it better to pay the smallest or the highest-rate debt first?
Paying the highest rate first saves the most money. Paying the smallest balance first gives quick wins that help some people stay motivated. Both work if you keep going.
What about student loans?
Treat them by their rate. Federal student loans may also offer income-driven repayment or forgiveness options that change the math; check them before paying extra.
Does paying off debt improve my net worth?
Not immediately: cash goes down and debt goes down by the same amount. It improves net worth over time by stopping interest — and it improves your monthly cash flow.
Sources
This article is for information only and is not investment, tax or legal advice. Figures are given with their source and date.
