Why a hybrid ranking beats pure snowball or avalanche
The classic methods each optimize for one thing. Snowball optimizes for psychology (smallest balance first, regardless of rate). Avalanche optimizes for math (highest APR first, regardless of balance). Neither is fully right. The hybrid ranking used here tries to capture both: any debt under $500 is automatically elevated for a fast win, then remaining debts are ordered by APR with a small deprioritization for anything under 7%.
The scoring logic, plainly
Each debt starts with a priority score equal to its APR. Then: if the balance is under $500, we add 15 points (this almost always pushes it to the front — a quick win you can eliminate in a single month or two). If the APR is 20%+, we add 10 points (high-APR debt is genuinely expensive). If the APR is under 7%, we subtract 5 (that's mortgage territory — no need to rush). The resulting ranked list is what the calculator above shows.
Why quick wins come first
A $380 store card at 28% is almost certainly your first target even though it's a small balance. Reasons: the APR is ugly, you can knock it out in one or two months with almost no pain, and removing one debt from your list delivers a disproportionate psychological boost. The math cost of not attacking the larger 22% Visa first is measured in tens of dollars; the morale benefit of a clean kill is measured in months of sustained motivation.
Why mortgages and low-APR student loans go last
A 5.75% student loan or a 6.25% mortgage looks high in today's rate environment but is actually a reasonable long-term cost of money. Every extra dollar going to those is a dollar not going to a 22% credit card, which costs you real interest savings. Deprioritizing them in the attack order is not "ignoring them" — it's letting them sit at their minimum while your extra cash does more damage elsewhere.
When to override the ranking
Three cases where your judgment should override the algorithm. (1) A co-signed debt with a family member — emotional incentive to clear it fast, even if math says otherwise. (2) A debt with a promotional rate that's about to expire (e.g., a 0% card at month 17 of an 18-month promo) — attack it immediately, algorithm be damned. (3) A debt specifically tied to a credit score problem you're trying to fix — paying a reported collection off may jump your score faster than paying a higher-APR debt.
What to do after the #1 debt is cleared
Re-run the calculator. The rankings shift — a quick win at #2 might now be a quick win at #1, or a formerly-middle APR debt might have moved up. The debt landscape changes as you make progress, so the attack order should too. Run it quarterly, minimum.
How this interacts with the full calculator
The full debt payoff calculator uses strict snowball or avalanche for its simulation. This priority calculator is the "which strategy applies to this specific debt" overlay — useful when your debts have asymmetric characteristics (very different balances, very different APRs, or a mix of secured and unsecured). Use both together: priority to decide order, full calculator to simulate the resulting timeline.
The rollover rule
Whatever payment you were sending to the #1 debt, roll it into the #2 debt's payment when #1 is cleared. Don't re-capture it as lifestyle spending. This is how the snowball mechanic works and why aggressive payoff accelerates near the end — your monthly "debt attack" payment stays constant as your number of debts shrinks.
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For education only. Not financial advice.