Why the Monthly Payment Is the Wrong Number to Focus On The monthly payment is a cash flow number. It tells you whether you can keep the lights on week to week. It tells you almost nothing about what the truck actually costs. What the truck actually costs is the purchase price plus every dollar of interest you pay from your first payment to your last. That number, the total cost of the loan, is what you need to know before you sign anything. On a typical owner-operator truck loan in the current market, the total interest paid over the life of a 60-month term can represent 20 to 30 percent of the purchase price on top of what you owe for the truck itself. On a longer term or at a higher rate, it can exceed 35 percent. Those are not small numbers on a $75,000 purchase. The calculation to produce this number is not complicated. It requires the purchase price, the interest rate expressed as APR, the loan term in months, and about five minutes with a spreadsheet or an online amortization calculator. What it requires first is understanding why the interest is structured the way it is. What Amortization Actually Means Every standard truck loan uses a structure called amortization, which means the total debt is divided into equal monthly payments across the loan term, with each payment covering a portion of principal, the amount you borrowed, and a portion of interest, the lender’s charge for lending…
