How Simple Interest Works in Financial Transactions
Simple interest is determined solely by multiplying the daily or annual interest rate by the principal amount and the number of days or years that elapse. The classic equation is SI = (P × R × T) / 100, where P is the initial principal, R is the annual interest rate, and T is the duration in years.
Simple Interest vs Compound Interest
In simple interest contracts, the interest earned or owed in Year 1 is identical to the interest in Year 5 because the principal remains flat. Under compound interest, unpaid interest is added back into the principal at each interval (annual, semi-annual, or quarterly), compounding the total sum exponentially over longer tenures.
Frequently Asked Questions
Can simple interest be computed for daily or monthly loans?
Yes. For monthly loans, time T is expressed as Months / 12. For daily interest calculations, time is expressed as Days / 365.
Do Indian banks offer simple interest on Fixed Deposits?
Bank fixed deposits with tenures below 6 months generally use simple interest calculated on a daily product basis. Deposits of 6 months or longer compound interest on a quarterly basis.
Is simple interest better for a borrower?
Yes. For a borrower, simple interest is always more economical than compound interest because you never pay interest on accumulated interest.