Simple interest is calculated only on the original principal, never on accumulated interest. The formula is I = P × r × t. It's used in some auto loans, personal loans, and short-term lending — anywhere lenders prefer transparency over compounding. A $20,000 simple-interest auto loan at 6% for 5 years costs $6,000 in interest, period. Compare that to compound interest where the math snowballs over time. From a borrower's perspective, simple interest is friendlier; from an investor's perspective, compound is the goal. Understanding which framework applies to a financial product is essential before signing any loan or savings agreement.
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Simple Interest
August 22, 2026 · Aditya Gupta
Personal Finance
Related terms
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Form 1099 is a family of IRS forms reporting various types of non-W-2 income. 1099-NEC reports nonemployee compensation…
529 Plan
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