Core Debt Payoff Rules of Thumb
- Never pay only the minimum on credit cards above 10% APR — the interest far outpaces the principal reduction
- Target your consumer debt (non-mortgage) paid off within 3–5 years of taking it on
- Any credit card APR above 15% is a financial emergency — prioritize it above saving beyond employer match
- Your total debt payments (including mortgage) should not exceed 43% of gross monthly income
- Each $1,000 extra payment on a 22% APR debt saves approximately $220/year in future interest permanently
- A balance transfer makes sense if: transfer fee < 3 months of current interest, and you can pay it off during the promotional period
- If your highest-rate debt is more than 5 percentage points above your second-highest, always avalanche
- A debt load more than 20% of annual income in consumer debt (non-mortgage) requires an active payoff plan
- A tax refund applied to debt is often worth more than any other use — compute before spending
- For every 1% of APR reduction on $10K debt, you save approximately $500 in total interest (rough estimate)
Debt payoff rules of thumb and the math behind them
| Rule | The Math Behind It | When It Breaks Down |
|---|---|---|
| Never pay only minimum | Minimum barely covers interest | Debt over $100K may need professional restructuring |
| 43% DTI maximum | Lender risk threshold; also real financial stress | Very high-income earners may tolerate more |
| $1K extra saves $220/yr at 22% | 22% × $1,000 = $220 annual interest saved | Assumes interest on remaining balance, not future |
| 5-year payoff target | Long enough to be achievable; short enough to limit cost | Very large student loan loads may need longer |
| BT makes sense if fee < 3 months interest | Quick break-even calculation | Depends on discipline to pay off before period ends |
🔑The One Rule That Matters Most
Pay more than the minimum, every month, without exception. Every other strategy builds on this foundation. If you do only one thing: set your payment to at least twice the minimum on your highest-rate debt and never decrease it.
Test These Rules Against Your Actual Debt
Run your specific numbers to see your payoff timeline, total interest, and how each extra dollar of payment changes the outcome.