At 3.5% simple interest, $50,000 earns $1,750 per year. Over 5 years, the total interest earned is $8,750, bringing your balance to $58,750. This predictable income stream makes simple interest attractive for retirees or conservative investors who need reliable returns on large sums.

For savers and investors, compound interest products are generally better because they earn interest on interest. However, if you're borrowing $50,000, a simple interest loan saves you money because you only pay interest on the original balance. Always compare the total cost or return over the full term before choosing a financial product.

Common simple interest products for large sums include U.S. Treasury bills and notes, certain corporate bonds, auto loans, and some fixed-term deposits at credit unions. Business lines of credit and commercial loans also frequently use simple interest. These products offer predictable returns or costs, which simplifies financial planning for large amounts.