Finance

Shop Credit Card Monthly Interest Calculator (10 Years)

Estimate monthly interest on a card balance. This shop version uses a 10-year planning term as its starting point.

The Monthly interest result is the interest charged on the balance each month at the entered annual rate, so paying only this amount each month covers the interest but leaves the balance unchanged, and over 10 years it would add up to $9,000 if only interest were paid on the default balance.

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 10 years. Using the page formula, monthly interest equals $5,000 times 18 divided by 100 divided by 12, which is $75.00 a month. That is the calculator's own result for these defaults, and it is the same on every page in this group because the term is not an input: only the balance and the rate decide the answer.

If only the $75.00 of interest is paid every month for 10 years, the total interest paid over 120 months is $9,000, and the $5,000 balance is still owed at the end, because interest-only payments never reduce the balance. That total is an illustration only, not a second output of this page: it assumes the rate stays at 18% and no new spending is added to the card.

Who this term suits for a shop owner: a shop owner spreading a larger refit, such as new shelving and refrigeration, where takings must cover the interest plus a steady payment toward the balance, or the card will still be there in 10 years.

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 shop 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 $75 a month look small but cost $9,000 over 10 years?
Because $75 times 120 months is $9,000, nearly twice the $5,000 balance, and the balance is still owed at the end if only interest is paid.

Is 10 years too long to carry a shop card balance?
Yes, for most shops. Ten years of card interest drains takings that could buy stock, pay rent, or fund a refit, and a cheaper shop loan usually costs far less over the same period.

What happens if the rate rises above 18 percent during 10 years?
The monthly interest rises with it. At 24 percent, for example, monthly interest on $5,000 becomes $100, so the same balance costs $25 more every month.

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