Should I pay off credit cards or invest?

Pay off credit cards first unless the APR is below 7-8%, which is rare. A 20% APR credit card costs you 20% per year in guaranteed interest. No investment reliably returns 20% per year. Paying off a 20% APR card is equivalent to earning a 20% return, risk-free. Only after credit card debt is cleared should you shift focus to investing. The OnSumo compound interest calculator can help you model investment returns for comparison.

What is a balance transfer and is it worth it?

A balance transfer moves your debt to a new card with a promotional 0% APR period (typically 12-18 months). You pay a one-time fee (usually 3-5% of the balance), but you eliminate interest during the promo period. If you can pay off the full balance before the promo expires, a balance transfer saves significant interest. If you cannot, you are back to a high APR and may have wasted the fee. Only transfer if you have a realistic payoff plan.

How do credit card payments get applied?

Credit card payments are applied to interest first, then principal. If you owe $5,000 at 20% APR and pay $100, roughly $83 goes to interest and only $17 reduces your balance in the first month. As the balance shrinks, the interest portion drops and the principal portion grows, but early payments feel like treading water. This is why extra payments have such a large impact: they go entirely to principal after covering interest.

What if I can only afford the minimum payment?

Paying only the minimum keeps you in debt for years and costs thousands in interest. If you genuinely cannot afford more, consider these options: balance transfer to a 0% APR card, negotiate a lower APR with your issuer, consolidate with a personal loan at a lower rate, or cut discretionary spending to free cash for extra payments. Even $20 more per month makes a material difference. The goal is to break out of the minimum-payment trap as fast as possible.

Should I pay off the highest balance or highest APR first?

Pay off the highest APR first (the avalanche method). A $1,000 balance at 25% APR costs you more in interest per month than a $5,000 balance at 15% APR. Paying the highest rate first minimizes total interest paid. Some people prefer the snowball method (smallest balance first) for psychological wins, but it costs more in total interest. Use the OnSumo debt snowball versus avalanche calculator to compare both strategies.

How does making extra payments early help?

Extra payments early in the payoff process save the most interest because they reduce the balance that compounds every month for the remaining life of the debt. Paying an extra $100 in month 1 of a 5-year payoff saves $100 × (1 + monthly rate)^60 in total interest. Paying the same $100 in month 59 saves almost nothing because there is only one month of compounding left. Front-load extra payments for maximum impact.

What is a personal loan consolidation?

A personal loan consolidation replaces your credit card debt with a fixed-rate installment loan, typically at a lower APR (8-15% instead of 20-30%). You get a lump sum to pay off the cards, then repay the loan over a fixed term (2-5 years). This works if the loan APR is lower than your card APR and you commit to not running up the cards again after paying them off. If you reopen the cards and carry balances, you end up with both the loan and new card debt.

How long does it take to recover my credit score after paying off cards?

Paying off credit card debt improves your credit utilization ratio (the percentage of available credit you are using), which is 30% of your FICO score. Most people see a score increase within 1-2 months of paying down balances. The effect is largest when utilization drops below 30%, and even larger below 10%. Keep the cards open after paying them off to maintain your total available credit and age of accounts.

Should I close a credit card after paying it off?

No, unless the card has an annual fee you do not want to pay. Closing a card reduces your total available credit, which increases your utilization ratio on remaining cards and can hurt your credit score. It also shortens your average account age if the card is old. Keep the card open, use it for a small recurring charge (e.g., a subscription), and pay it off in full each month to maintain the account.

What if my APR increases while I am paying off the balance?

Variable-rate credit cards can increase APR when the Federal Reserve raises interest rates, or when you miss a payment and trigger a penalty APR (often 29.99%). If your APR rises, your monthly interest cost rises, which extends your payoff timeline. Increase your monthly payment to compensate, or consider a balance transfer or consolidation loan to lock in a lower fixed rate. The OnSumo loan payoff calculator can help you model alternative payoff strategies.

Credit Card Payoff Calculator

Enter balance and APR, compare paying only the minimum vs a steady fixed payment or a debt-free-by date goal. Charts and totals update as you type.

100% client-side. Your inputs stay in this browser.

Compare paying only the minimum vs a steady fixed payment or a target payoff date, totals and chart update instantly.

Country / region

Saved with your inputs. Amounts display in USD.

Card balanceCurrent revolving balance you want to eliminate.APR (%)Purchase APR from your statement (default sourced from Fed consumer credit stats, refresh periodically).

Payment strategy

Minimum onlyFixed amountPay off by date

Minimum rule used here: max(1% + monthly interest, $25).

Fixed payment / monthMust exceed first-month interest ($95) and be at least your modeled minimum ($145).

Minimum only

19 yr 4 mo

$8,414 interest

Debt-free ~ Jan 16, 2046

Your plan (Fixed $200/mo)

2 yr 11 mo

$1,847 interest

Debt-free ~ Aug 16, 2029

Paying only the minimum costs about $6,567 extra in interest and adds roughly 16 years (197 mo) versus your current plan.

Balance over time

Gray: minimum-only path. Green: your selected strategy (when blocked, green stays flat at your balance).

How this tool works

This calculator takes your credit card balance, APR, and monthly payment to show how long it takes to pay off the debt and how much total interest you will pay. It uses the standard amortization formula, where each payment covers accrued interest first and the remainder goes to principal. The tool also shows what happens if you increase your monthly payment: every extra dollar reduces the payoff timeline and total interest, often by more than you expect because it stops interest from compounding on that dollar for the remaining life of the debt.

When to use it

Use this calculator when you carry a credit card balance and want to see the true cost of minimum payments versus aggressive payoff strategies. It is especially valuable when evaluating whether to allocate extra cash toward debt payoff versus other goals (saving, investing), or when comparing the value of a balance transfer to a 0% APR card versus paying down your current card faster. The tool is also useful for setting a realistic payoff target and tracking progress toward debt freedom.

How to interpret results

The calculator shows months to payoff and total interest paid. If you pay the minimum only, the timeline may stretch years and total interest may exceed your original balance, especially at APRs above 20%. The tool also shows the payoff date, which gives you a concrete target. If the timeline is unacceptably long, increase the monthly payment input to see how much faster you can pay off the debt. Even an extra $50 per month can cut years off the timeline and save thousands in interest.

Worked example

Balance: $5,000. APR: 18%. Minimum payment (2% of balance): $100/month. Payoff timeline: 94 months (nearly 8 years). Total interest paid: $4,311, nearly as much as the original balance. If you increase the payment to $200/month, the timeline drops to 31 months and total interest falls to $1,124, a $3,187 savings. If you increase it to $300/month, you pay off in 19 months with only $692 in interest, saving $3,619. The difference between $100 and $300 per month is $200, but it saves $3,619 and cuts the timeline by 75 months.

Key definitions

APR (Annual Percentage Rate) is the yearly interest rate charged on credit card balances; a 20% APR means you pay 20% of your balance in interest annually if you carry a balance month to month.

Minimum payments are designed to keep you in debt as long as possible; paying only the minimum can result in total interest costs that exceed the original balance.

Compound interest works against you in debt just as it works for you in investing; every month you carry a balance, you pay interest on interest, accelerating the total cost.

A balance transfer to a 0% APR card eliminates interest for a promotional period (typically 12-18 months), allowing every dollar of payment to reduce principal and dramatically shortening payoff timelines.

Frequently asked questions

Should I pay off credit cards or invest?
Pay off credit cards first unless the APR is below 7-8%, which is rare. A 20% APR credit card costs you 20% per year in guaranteed interest. No investment reliably returns 20% per year. Paying off a 20% APR card is equivalent to earning a 20% return, risk-free. Only after credit card debt is cleared should you shift focus to investing. The OnSumo compound interest calculator can help you model investment returns for comparison.
What is a balance transfer and is it worth it?
A balance transfer moves your debt to a new card with a promotional 0% APR period (typically 12-18 months). You pay a one-time fee (usually 3-5% of the balance), but you eliminate interest during the promo period. If you can pay off the full balance before the promo expires, a balance transfer saves significant interest. If you cannot, you are back to a high APR and may have wasted the fee. Only transfer if you have a realistic payoff plan.
How do credit card payments get applied?
Credit card payments are applied to interest first, then principal. If you owe $5,000 at 20% APR and pay $100, roughly $83 goes to interest and only $17 reduces your balance in the first month. As the balance shrinks, the interest portion drops and the principal portion grows, but early payments feel like treading water. This is why extra payments have such a large impact: they go entirely to principal after covering interest.
What if I can only afford the minimum payment?
Paying only the minimum keeps you in debt for years and costs thousands in interest. If you genuinely cannot afford more, consider these options: balance transfer to a 0% APR card, negotiate a lower APR with your issuer, consolidate with a personal loan at a lower rate, or cut discretionary spending to free cash for extra payments. Even $20 more per month makes a material difference. The goal is to break out of the minimum-payment trap as fast as possible.
Should I pay off the highest balance or highest APR first?
Pay off the highest APR first (the avalanche method). A $1,000 balance at 25% APR costs you more in interest per month than a $5,000 balance at 15% APR. Paying the highest rate first minimizes total interest paid. Some people prefer the snowball method (smallest balance first) for psychological wins, but it costs more in total interest. Use the OnSumo debt snowball versus avalanche calculator to compare both strategies.
How does making extra payments early help?
Extra payments early in the payoff process save the most interest because they reduce the balance that compounds every month for the remaining life of the debt. Paying an extra $100 in month 1 of a 5-year payoff saves $100 × (1 + monthly rate)^60 in total interest. Paying the same $100 in month 59 saves almost nothing because there is only one month of compounding left. Front-load extra payments for maximum impact.
What is a personal loan consolidation?
A personal loan consolidation replaces your credit card debt with a fixed-rate installment loan, typically at a lower APR (8-15% instead of 20-30%). You get a lump sum to pay off the cards, then repay the loan over a fixed term (2-5 years). This works if the loan APR is lower than your card APR and you commit to not running up the cards again after paying them off. If you reopen the cards and carry balances, you end up with both the loan and new card debt.
How long does it take to recover my credit score after paying off cards?
Paying off credit card debt improves your credit utilization ratio (the percentage of available credit you are using), which is 30% of your FICO score. Most people see a score increase within 1-2 months of paying down balances. The effect is largest when utilization drops below 30%, and even larger below 10%. Keep the cards open after paying them off to maintain your total available credit and age of accounts.
Should I close a credit card after paying it off?
No, unless the card has an annual fee you do not want to pay. Closing a card reduces your total available credit, which increases your utilization ratio on remaining cards and can hurt your credit score. It also shortens your average account age if the card is old. Keep the card open, use it for a small recurring charge (e.g., a subscription), and pay it off in full each month to maintain the account.
What if my APR increases while I am paying off the balance?
Variable-rate credit cards can increase APR when the Federal Reserve raises interest rates, or when you miss a payment and trigger a penalty APR (often 29.99%). If your APR rises, your monthly interest cost rises, which extends your payoff timeline. Increase your monthly payment to compensate, or consider a balance transfer or consolidation loan to lock in a lower fixed rate. The OnSumo loan payoff calculator can help you model alternative payoff strategies.

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