Credit Card Payoff Interest Calculator (2026)

How credit card interest is calculated, in plain math

Credit cards charge interest using the average daily balance method documented by the CFPB. The mechanics:

1. Take your APR and divide by 365 to get the daily periodic rate. At 22.30% APR, the daily rate is 0.0611%.
2. Multiply the daily rate by your balance each day to get that day’s interest accrual.
3. Sum every day’s accrual across the billing cycle (usually 28 to 31 days).
4. The result is your interest charge for that cycle.

Most issuers post the interest charge as a single line on the statement, but the underlying accrual happens daily, which is why mid-cycle payments reduce more interest than end-of-cycle payments. See does paying mid-cycle save interest for the daily-accrual mechanics.

Total interest by payment level on a $5,000 balance at 22.30% APR

The minimum-only row is the most-cited stat on credit card payoff for a reason: lifetime interest exceeds the original principal by $2,184. This is the structural outcome the CARD Act 36-month disclosure was designed to make visible on every statement.

How APR scales the interest cost

Hold the monthly payment at $200 and vary APR on the same $5,000 balance:

The interest spread between 17.99% APR (typical credit-union rate) and 29.99% APR (penalty rate after 60-day delinquency, per most cardholder agreements) is $936 on this single balance. Multiplied across the Federal Reserve Survey of Consumer Finances figure of 3.8 cards per cardholder with revolving balances, APR differences alone can account for $2,000 to $5,000 in household interest costs per year.

How to run interest-focused scenarios on the pillar tool

The pillar calculator displays total interest alongside months-to-payoff for every scenario. To run interest-focused planning:

1. Enter your balance, APR, and current monthly payment. The output shows your current total interest.
2. Increase the monthly payment by $50 increments. Note how total interest falls at each step.
3. Run a “balance transfer” comparison: set APR to 0% for an intro period (e.g., 18 months) followed by your card’s regular APR. The output models the post-promo interest if the balance is not fully cleared.
4. Run a “consolidation loan” comparison: change the APR to your loan’s APR (typically 10% to 14% per NCUA credit union loan rate data) and the term to the loan’s repayment schedule.

The side-by-side outputs make total interest the headline number rather than monthly payment, which is the financially correct way to evaluate every payoff option.

Worked interest scenario: Devon at $11,400 balance

Devon carries $11,400 on a single Mastercard at 22.30% APR. Available budget: $400 per month.

Minimum-only path. Starting minimum: $114 (1% + interest floor). Declining over 196 months. Total interest: $16,380. The total amount paid: $27,780.

Fixed $400 path. Months to payoff: 36. Total interest: $3,051. Total amount paid: $14,451.

Fixed $400 plus biweekly cadence. Months to payoff: 32. Total interest: $2,729. Savings vs monthly $400: $322 and 4 months.

0% balance transfer (18-month intro, 3% transfer fee) + fixed $400. Transfer fee: $342. Balance cleared in cycle 29 with no interest during the intro. Post-promo balance carried through cycle 36 at 22.30% (assumed reverts to original card APR). Total interest: $172. Total cost including fee: $514. Savings vs fixed $400 alone: $2,537.

The balance-transfer route wins on interest by $2,537, but only if Devon executes the post-promo clean-up. If Devon misses, the math reverts to roughly the fixed $400 case minus the wasted transfer fee.

Why minimum-only is the most expensive option in modern finance

A 22.30% APR is roughly 4x the Federal Reserve 30-year mortgage rate and 8x to 15x typical savings-account yields. Carrying a credit card balance is one of the highest-cost forms of consumer debt available. The CFPB’s 2025 Consumer Credit Card Market Report documents that cardholders who pay only the minimum carry balances roughly 3x longer than cardholders who pay above the minimum, and pay roughly 4x the lifetime interest. The math case for any payment above the minimum is overwhelming.

Reducing interest is a 3-lever problem

These compound. A household that does all three on a $10,000 portfolio typically cuts interest from $7,000+ (minimum-only at 22% APR) to under $800 (consolidated to 11% APR with biweekly $350 payments).

When to prioritize interest reduction over speed

Most readers want to minimize total interest. But two scenarios favor a slower payoff to optimize a different metric:

1. Imminent mortgage application. Paying down balances slowly while keeping credit lines open reduces utilization without closing accounts, which can support a higher FICO score for the mortgage underwriting. See does paying off debt drop credit score.
2. Emergency-fund parallel build. If your emergency reserve is below one month of expenses, splitting the budget 70% to debt and 30% to savings produces a healthier total household position than 100% to debt, despite costing $200 to $600 more in interest. See should I pay off debt or save.

These are exceptions. For most readers, minimizing total interest is the right objective function.

Interest math for tax purposes

Credit card interest paid on personal accounts is not tax-deductible under IRS Topic 505, Interest Expense. Only credit card interest on business accounts (where charges are exclusively for business expenses) qualifies as a deductible business expense. This is the opposite of mortgage interest, which is deductible up to the IRS thresholds. The non-deductibility of credit card interest is part of why aggressive payoff produces a better after-tax return than slow payoff for most households.

Interest accrual during a hardship program

If you enter a credit card hardship program with the issuer (typically a 6-to-12-month reduced-payment period), most issuers continue to accrue interest at a reduced APR (often 6% to 10%) during the hardship. The CFPB documents that hardship programs reduce monthly payment burden but do not eliminate interest entirely. The reduced-APR period is a temporary bridge, not a forgiveness. Confirm the exact terms in writing from the issuer before relying on the program for interest savings. See what to do if you cannot afford credit card minimum payment.

Sources

1. Federal Reserve G.19 Consumer Credit Release, accessed 2026-05-13.
2. CFPB Consumer Credit Card Market Report 2025, accessed 2026-05-13.
3. CFPB explainer: How is my credit card interest calculated?, accessed 2026-05-13.
4. IRS Topic 505, Interest Expense, accessed 2026-05-13.

Sibling spokes

• Credit card payoff time calculator
• How is credit card interest calculated
• How does daily periodic rate work
• Does credit card interest compound daily
• Multi card payoff calculator

Parent hub

• Avalanche vs snowball method

Related

• Credit card payoff calculator (home)
• 0 APR balance transfer calculator
• Best debt consolidation loans 2026

Frequently asked questions

How much interest will I actually pay on my credit card?

It depends on the balance, the APR, and how long you take to pay off. On a $5,000 balance at 22.30% APR (the current Federal Reserve average) paying only the minimum, total interest is roughly $7,184 over a 16-year payoff. Paying $250 per month cuts total interest to $1,235 over 24 months. The pillar calculator returns the exact figure for your inputs.

Why is total interest higher than my balance?

Because minimum payments are mostly interest. At 22.30% APR on a $5,000 balance, the first month’s interest is roughly $93. If your $143 minimum payment is 65% interest and 35% principal, principal drops by only $50 in month one. Compounded across 196 months of declining minimums, total interest can exceed the original principal by 30 to 50%.

How do credit card issuers actually calculate interest?

Most issuers use the average daily balance method documented by the CFPB. Each day, your balance accrues interest at the daily periodic rate (APR divided by 365). The cycle’s interest charge equals the average daily balance multiplied by the daily rate multiplied by the number of days in the cycle. This is why mid-cycle payments save more than end-of-cycle payments.

Does paying off faster reduce interest by a specific ratio?

Yes, roughly inversely with the payoff time. Cutting payoff time in half cuts total interest by 50 to 60%. The relationship is non-linear because interest accrues against the declining balance, so the first months of payoff carry the highest interest charges. Front-loaded extra payments save disproportionately.

Can I see interest savings before I commit to a payoff plan?

Yes. The pillar calculator at ccpayoffcalc.com lets you run multiple scenarios side by side. Enter your balance and APR once, then compare minimum-only, fixed $200, fixed $300, and balance-transfer paths. The output shows total interest for each, so you see the dollar value of every monthly-payment increment before making a commitment.