Amortization
What is amortization? Amortization is the process of paying off a loan through scheduled equal payments where each payment is split between interest on the remaining balance and reduction of the principal.
Full definition
Amortization is how nearly all truck financing, real estate loans, and term-structured working capital loans repay. The borrower makes the same payment every month for the entire term, but the split between interest and principal shifts over time. Early payments are mostly interest because the principal balance is high; late payments are mostly principal because the balance has dropped.
For a $130,000 truck financed at 9% APR over 60 months, the monthly payment is roughly $2,700. Of the first month's payment, ~$975 is interest and ~$1,725 is principal. By month 50, the same $2,700 payment is roughly $260 interest and $2,440 principal. The total interest paid over the life of the loan is ~$32,000.
This front-loaded interest structure is what makes early payoff and extra-principal payments so effective. Adding $200 a month to a 60-month truck loan can knock several months off the term and save thousands in interest because the extra payment directly reduces the principal balance and lowers every subsequent month's interest accrual.
The truckers.finance truck-financing calculator generates a full amortization schedule — monthly payment, running interest paid, running principal paid, and remaining balance — for any combination of loan amount, APR, and term. Use it before refinancing to see whether the new APR pays back the origination cost.
Example
- On a $100,000 loan at 8% APR over 60 months ($2,028/month payment): month 1 splits ~$667 interest / $1,361 principal; month 60 splits ~$13 interest / $2,015 principal.