Guides · Updated June 21, 2026 · 5 min read

Which Debt Should You Pay Off First?

When you have several debts and a limited amount of extra cash, the order you pay them in genuinely matters — it can save you thousands. Here's the simple rule, plus the common exceptions worth knowing.

The simple rule: highest interest rate first

Mathematically, you save the most money by paying off the debt with the highest APR first, while making minimum payments on everything else. This is the debt avalanche method. Because high-rate debt grows fastest, eliminating it stops the most interest from piling up.

For most people, that means credit cards before car loans before student loans, because credit cards usually carry the highest rates by far.

Car loan vs. credit card: a quick example

Even though the car loan balance is larger, the credit card costs far more per dollar owed. Putting every spare dollar on the 23% credit card first saves dramatically more interest than chipping at the 7% car loan. Once the card is gone, you roll that payment onto the car loan.

When to break the rule

• You need a motivation win. If staying consistent is your real challenge, paying off a small balance first (the snowball method) can be worth more than a few dollars of interest — because momentum keeps you going.
• A debt is about to hurt your credit. If one account is near its limit or close to going late, address it first to protect your credit score.
• Tax-advantaged or very low-rate debt. Some debts (like certain student loans or low-rate mortgages) are cheap enough that aggressively investing or building an emergency fund may make more sense than rushing to pay them off.
• No emergency fund yet. Keep a small starter emergency fund (even $1,000) before going all-in on debt, so a surprise expense doesn't push you back onto the cards.

How to set up your payoff order, step by step

Turning the rule into an actual plan takes about ten minutes:

1. List every debt with its balance, minimum payment, and APR. Pull the APR from your latest statement — not the "introductory" rate, the one you're actually being charged now.
2. Sort by APR, highest first. That ordering is your attack list if you're using the avalanche method. If you'd rather use snowball, sort by balance, smallest first, instead.
3. Pay every minimum, every month. Missing a minimum triggers late fees and can spike your APR even higher, which undoes the math entirely.
4. Throw every spare dollar at the top debt until it hits zero, then roll its old payment onto the next one. This "rollover" is what makes either method accelerate over time.

A calculator does the sorting and the rollover math for you, and shows the exact month each debt disappears — useful for staying motivated when progress feels slow.

Common mistakes that cost you money

• Chasing balances instead of rates. A $1,000 card at 25% costs more each year than a $5,000 loan at 5%. Big numbers feel urgent, but the rate is what actually drains your wallet.
• Closing a card the moment you pay it off. Closing accounts can lower your available credit and shorten your credit history, nudging your score down. Pay it off, then keep it open and unused.
• Ignoring promo-rate expirations. A 0% balance-transfer card can jump to 24% on a set date. Note that date and prioritize clearing the balance before it hits.
• Going so aggressive you have no cushion. Without a small emergency fund, the next surprise bill goes straight back on a credit card — and you're paying it off twice.

The bottom line

Default to highest-interest-first to save the most money. Switch to smallest-balance-first if you need motivation, and handle any credit-threatening account as a priority. Whichever you choose, keep making minimums on everything else and roll freed-up payments forward.

Related: Debt snowball vs. avalanche · How to pay off $10,000 in credit card debt