Understanding Loan Payments: A Practical Guide
A plain-language explanation of how monthly loan payments work, what the math behind amortization means for you, and how to use the numbers to compare offers before you sign.
Figur Editorial · Explains the math behind everyday financial decisions · 2026-08-22
How a monthly payment is calculated
A standard installment loan uses a formula called amortization. Each month, the lender applies the monthly interest rate to the remaining principal to find the interest charge for that period. The remainder of your fixed payment reduces the balance.
The monthly rate is the APR divided by 12. For a $25,000 loan at 6.5% APR over 60 months, the monthly rate is 0.065 / 12, or about 0.5417%. Figur's loan calculator applies this rate using the standard amortization formula to return the fixed monthly payment.
This calculation assumes interest compounds monthly and that every payment is made on the exact due date. Real-world payment timing, lender rounding conventions, and any fees not included in the APR can cause your actual bill to differ slightly.
What APR includes and what it leaves out
APR stands for Annual Percentage Rate. For many consumer loans, lenders are required to disclose the APR so borrowers can compare products on a level basis.
APR typically includes the nominal interest rate plus certain mandatory fees, such as origination fees, spread across the loan term. It does not always include optional add-ons like credit insurance, prepayment penalties, or late fees.
A loan with a lower interest rate but high origination fees can carry a higher APR than a loan with a slightly higher rate and no fees. Comparing APRs, not just rates, gives a more complete picture of cost.
- Usually included: nominal interest rate, required origination fees, mandatory mortgage points
- Often excluded: optional insurance products, penalty fees, third-party settlement costs
- Always read the loan disclosure document to confirm what is and is not captured in the stated APR
How term length affects total cost
A longer repayment term lowers the monthly payment but increases the total interest paid over the life of the loan. A shorter term does the reverse: higher monthly payments, less total interest.
For example, a $20,000 loan at 7% APR paid over 36 months carries a monthly payment of about $617 and total interest of roughly $2,200. Stretched to 72 months, the payment drops to about $344 but total interest rises to around $4,800.
Choosing the right term means balancing what fits your monthly budget against the long-term cost you are willing to accept. There is no universally correct answer; it depends on your cash flow and financial goals.
Comparing loan offers side by side
To compare two loan offers accurately, calculate the total amount paid over the full term for each: multiply the monthly payment by the number of months, then add any upfront fees not included in the APR.
A lender might offer a lower APR but require a fee paid at closing. Run both through the same calculator with the same term to see which one costs less in total dollars out of pocket.
Pre-qualification inquiries that use a soft credit pull do not affect your credit score. Hard inquiries submitted during a short rate-shopping window, typically 14 to 45 days depending on the scoring model, are usually treated as a single inquiry.
- Compare total cost (monthly payment times months plus upfront fees), not just monthly payment
- Confirm whether the APR accounts for all required fees before comparing
- Rate-shop within a short window to limit the credit score impact of hard inquiries
Important: this is information, not advice
The content in this guide and Figur's loan calculator are for informational and educational purposes only. They are not a substitute for advice from a licensed financial professional, lender, or credit counselor.
Actual loan terms, interest rates, and approval decisions depend on your credit profile, income, the lender's underwriting criteria, and current market conditions. Results from a calculator are estimates based on the inputs you provide.
Before making a borrowing decision, review the full loan agreement, consult a qualified professional if needed, and consider your complete financial picture.