Finance

Investment Loan Total Interest Calculator (15 Years)

Estimate total interest paid over a loan. This investment version uses a 15-year planning term as its starting point.

The Total interest is the amount paid on top of the loan itself over 15 years, and the Total paid is the loan amount plus that interest, so comparing the two figures shows the true cost of borrowing for this term.

Formula

Total interest equals monthly EMI times number of payments minus the principal.

How it works

A longer term lowers the monthly payment but raises total interest.

Worked example

Loan amount $200,000, annual rate 6.5%, term 15 years. The number of monthly payments is 15 times 12, which is 180 payments. Using the page formula, the monthly EMI is $1,742.21, total paid is $1,742.21 times 180, which is $313,598.65, and total interest is $313,598.65 minus $200,000, which is $113,598.65. That is the calculator's own result for these defaults. Note how the monthly payment falls as the term lengthens, while total interest rises every time: a longer loan is cheaper each month but more expensive overall.

Who this term suits for an investor: an investor holding a rental property or a small business asset for the medium term, where a $1,742.21 payment is easier to carry from rental income but $113,598.65 of interest must still be earned back before any real profit.

FAQs

Why does a longer loan cost more interest?
More payments mean interest is charged for longer, so total interest rises even if each payment is smaller.

Is this investment 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.

Is $113,598.65 of interest over 15 years acceptable for an investor?
Only if the property or business earns well above that in rent or profit over the same 15 years, after all running costs and taxes.

Why does the payment fall but total interest keep rising?
A longer term spreads the principal over more payments, so each payment is smaller, but interest runs for 180 months instead of 60 or 120.

Should an investor overpay a 15-year loan when income is strong?
Extra payments cut the balance early and reduce total interest, but only after keeping a cash reserve for repairs, vacancies and tax bills.

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