Finance

Business Credit Card Monthly Interest Calculator (15 Years)

Estimate monthly interest on a card balance. This business version uses a 15-year planning term as its starting point.

In real terms, the Monthly interest figure is the cost of carrying the balance for one month, so a payment equal to it does not reduce the balance, and only a larger payment brings the balance down.

Formula

Monthly interest equals balance times annual rate divided by 100 divided by 12.

How it works

Paying only interest leaves the balance unchanged. Paying more than interest reduces the balance.

Worked example

Balance $5,000, annual rate 18%, term 15 years. Monthly interest is $5,000 times 18, divided by 100, divided by 12, which is $75.00 a month. That is the calculator's own output, and it is the same every month because the balance and rate do not change. If the business pays only interest, after 15 years it has paid $13,500 in interest, which is 270% of the balance, and it still owes the original $5,000. Paying more than $75.00 in any month is what finally reduces that balance.

Who this term suits for a business: a growing firm paying recurring costs on a card, such as software, advertising, or travel, where the monthly $75 hides a 15-year interest bill of $13,500, nearly three times the balance.

FAQs

Why is card interest high?
Card rates are usually higher than loan rates, so balances grow quickly if only minimum payments are made.

Is this business calculator exact?
No, it is an estimate for planning only, based on the numbers you enter.

Are these figures financial advice?
No, they are estimates for planning only, not financial advice. Check with a qualified adviser for decisions involving large sums.

Why does $13,500 interest over 15 years matter more than the $75 monthly figure?
Because $75 a month for 180 months is $13,500, which is 270% of the $5,000 balance, while the balance itself is still owed in full.

What happens if a business raises its card limit during those 15 years?
The monthly interest rises with the balance, so the $75 figure no longer holds: rerun this calculator with the new balance before spending more.

Is a 15-year card balance a sign the business pricing is too low?
It can be: if regular costs can only be met on a card, the business may be charging too little or collecting payment too slowly, and that needs fixing, not more credit.

Estimates only, not financial advice. Figures are approximate and do not include all fees, taxes, or changing rates unless stated.