Multiple Debts? Which Interest Rate to Pay Off First

Michael Chen

Michael Chen writes about personal finance fundamentals. Bay Area-based · finance enthusiast for 15 years.

Visual representation of the voice · not a photographic portrait

Quick answer: Pay the minimum on every debt, then put all extra money on the debt with the highest interest rate (the avalanche method). When it is paid off, roll its whole payment into the next-highest rate. If you need quick wins to stay motivated, start with the smallest balance instead.↗ Share on X

If you have several debts with different interest rates, pay the minimum on every one of them, then send every extra dollar to the debt with the highest interest rate first. When that one is gone, roll the money you were paying on it into the next-highest rate. This is called the avalanche method, and it costs you the least in total interest. The one big exception: if you keep quitting debt plans, start with the smallest balance instead, because a quick win can keep you going.

That is the short answer. The rest of this page shows you how to set it up in one evening, with real math, and how to handle the tricky cases: 0% promo cards, student loans, and debts that are already in collections.

Step 1: What do you actually owe, and at what rate?

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You cannot pick an order until you can see everything in one place. Grab a sheet of paper or open a notes app and list every debt with four facts:

1. Name (for example, "Visa card" or "car loan")

2. Balance (what you owe today)

3. APR (the yearly interest rate; it is printed on your statement or in your online account)

4. Minimum payment (the smallest amount you must pay each month)

Do not skip the small ones. A $300 store card at 29% APR matters.

Here is an example list we will use for the rest of this article:

Step 2: How much extra money can you put toward debt each month?

The order only matters if you pay more than the minimums. Look at last month's spending and find a real number you can repeat every month. It does not need to be big. Even $100 a month extra changes the timeline.

A simple way to find it:

• Add up your take-home pay for the month.
• Subtract rent or mortgage, utilities, groceries, transportation, insurance, and the total of your minimum payments.
• What is left, minus a small cushion for surprises, is your "extra."

In our example, say the person can pay $970 a month total. That is $670 in minimums plus $300 extra.

Before you send extra money to debt, keep a small emergency fund. Even $500 to $1,000 in savings stops a flat tire or a doctor's bill from going straight back onto a credit card. Without it, many people pay down a card and then run it right back up.

Step 3: Which order saves the most money?

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The avalanche method (highest rate first)

Sort your list from the highest APR to the lowest. Pay minimums on everything, and put the full $300 extra on the top line.

With our example, the order is:

1. Store card (29%)

2. Visa card (24%)

3. Personal loan (13%)

4. Car loan (7%)

5. Student loan (5%)

Why it works: interest is charged as a percentage of the balance. A dollar sitting on a 29% card costs you about 29 cents a year. The same dollar on a 5% student loan costs about 5 cents. Paying the expensive dollar first is pure math.

The snowball method (smallest balance first)

Sort your list from the smallest balance to the largest, no matter the rate. Pay minimums on everything and put the extra on the smallest balance.

In our example, the store card happens to be both the smallest balance and the highest rate, so both methods start in the same place. After that they split: the snowball would go to the personal loan ($3,500) before the Visa ($4,200), even though the Visa charges almost twice the interest.

Avalanche vs. snowball side by side

How big is the difference? It depends on your numbers. When your highest-rate debts are also your biggest, the avalanche can save hundreds or even thousands of dollars. When your rates are close together, the difference can be small. Plug your own list into any free online debt payoff calculator and compare the two totals. Use the one you will actually follow.

Step 4: How does the "roll-over" work in practice?

This is the part that makes either method fast. When one debt hits zero, you do not get a raise. You move its whole payment to the next debt on the list.

Using our example and the avalanche order:

1. Months 1 to 3: Store card gets $35 + $300 = $335 a month. Everything else gets its minimum. The $900 card is gone in about three months.

2. Next: The Visa now gets its own $105 + the $335 you freed up = $440 a month.

3. When the Visa is paid off: the personal loan gets its $120 + $440 = $560 a month.

4. Then: the car loan gets $260 + $560 = $820 a month.

5. Last: the student loan gets everything, the full $970.

Your total payment stays the same $970 the whole time. You just keep pointing it at a new target. That is why it is called a snowball or avalanche: the payment grows as it rolls.

What about 0% promo cards and balance transfers?

A 0% promotional rate changes the order, but only until the promo ends. Two rules:

• Look at the end date. Divide the balance by the months left. If you can pay it off before the promo ends, it can sit lower on your list. If you cannot, the remaining balance will jump to a high rate, often above 20%.
• Watch for "deferred interest." Some store cards say "no interest if paid in full in 12 months." If you miss that by even one dollar, they can charge all the interest back to the first day. Read the terms. If your card works this way, treat it as a top priority before the deadline.

A balance transfer card can help if you have good credit, but there is usually a transfer fee (often 3% to 5% of the amount moved). Only do it if the interest you save is clearly more than the fee, and if you will stop using the old card.

Where do student loans and mortgages fit?

Low-rate debts like a 4% mortgage or a 5% student loan usually go at the bottom of the list. Pay the minimum and focus extra cash on anything above roughly 8% to 10%.

Two things to check on federal student loans before paying them early:

• If you are on an income-driven repayment plan or working toward Public Service Loan Forgiveness, extra payments may not help you. In some cases they reduce the amount that would be forgiven.
• Call your loan servicer or check the federal student aid website to confirm your plan before changing anything.

What if a debt is already in collections?

Debts that are past due or in collections need different handling. The rate is no longer the only thing that matters. Late fees, damage to your credit report, and the risk of a lawsuit all come into play.

• Ask for written validation of the debt before you pay a collector.
• Do not make a small "good faith" payment by phone without knowing your state's rules. In some states, a payment can restart the clock on old debts.
• Get any settlement deal in writing before you send money.

This is the point where you should talk to a nonprofit credit counselor. Look for agencies that are members of the National Foundation for Credit Counseling (NFCC). Many offer a free first session. If you are being sued or facing wage garnishment, talk to a consumer attorney or your local legal aid office.

Can a consolidation loan make this simpler?

A debt consolidation loan pays off several debts and leaves you with one payment. It only helps if:

• The new interest rate is lower than the average rate you are paying now.
• The fees (often called an origination fee) are small.
• You do not run the credit cards back up after they are paid off.

If the new loan has a lower monthly payment only because it stretches over more years, you may pay more interest in total. Compare the total cost, not just the monthly payment.

Common mistakes that slow you down

• Paying extra on the wrong debt. Some lenders apply extra money to future payments instead of the balance. Check your statement, or tell the lender in writing to apply it to principal (the amount you borrowed).
• Missing a minimum to make a bigger payment elsewhere. Missed minimums bring late fees and can trigger a penalty APR. Always pay every minimum first.
• Closing paid-off cards right away. It can lower your credit score by shrinking your available credit. If the card has no yearly fee, it is often better to keep it open and unused.
• Not asking for a lower rate. Call your card company and ask. It takes ten minutes and sometimes works, especially if you have paid on time for a year.

Your next step tonight

1. Write down every debt with balance, APR, and minimum payment.

2. Pick one number for your monthly extra, even if it is $50.

3. Sort the list by highest APR (or by smallest balance, if you need fast wins).

4. Set up autopay for every minimum so you never miss one.

5. Send the extra to the top of your list this month, and put a reminder on your calendar to check your progress next month.

If your minimum payments alone are more than you can cover, stop here and call a nonprofit credit counselor before choosing any method. A plan you cannot afford will not last, and they can help you find one that will.

FAQ

Is the avalanche or snowball method better?

The avalanche method (highest rate first) costs less in total interest. The snowball method (smallest balance first) pays off your first debt faster, which helps some people stay motivated. The better one is the one you will stick with.

Should I save money or pay off debt first?

Keep a small emergency fund of about $500 to $1,000 first. Without it, a surprise bill often goes back onto a credit card and undoes your progress.

When should I get professional help with debt?

If you cannot cover your minimum payments, a debt is in collections, or you are facing a lawsuit or garnishment, talk to a nonprofit credit counselor or a consumer attorney before choosing a payoff method.

Educational content, not personalized financial advice. Sources cited where applicable.