Monthly Payment vs. Total Cost
These two numbers tell different stories. Monthly payment determines affordability — whether you can cover the obligation each month without strain. Total cost is what you actually spend to borrow the money. A longer-term loan always has a lower monthly payment but a higher total cost. A shorter-term loan costs more each month but less overall.
When comparing two loans, decide which constraint matters more. If your budget is tight, the lower monthly payment may be necessary. If you have flexibility, the loan with the lower total cost saves real money over time.
Why the Same Rate Can Produce Different Total Costs
Two loans at the same APR but different terms will have significantly different total costs. On a $20,000 loan at 8% APR:
| Term | Monthly Payment | Total Interest | Total Cost |
|---|---|---|---|
| 36 months | $627 | $2,572 | $22,572 |
| 60 months | $406 | $4,332 | $24,332 |
| 84 months | $311 | $6,100 | $26,100 |
The 84-month loan has a monthly payment $316 lower than the 36-month loan — but costs $3,528 more in total interest. That difference is real money paid to the lender in exchange for smaller payments.
How Origination Fees Change the Math
An origination fee is a one-time charge deducted from your disbursement or added to your balance. It can change which loan is actually cheaper, even when the interest rate looks better. For example:
| Loan A | Loan B | |
|---|---|---|
| Amount | $10,000 | $10,000 |
| APR | 9% | 11% |
| Term | 36 months | 36 months |
| Origination Fee | $500 | $0 |
| Total Interest | $1,426 | $1,753 |
| Total Cost | $11,926 | $11,753 |
Loan A has the lower rate but the higher fee makes it more expensive overall. Always include fees when comparing offers — APR is the best single number to compare, since it factors in fees.
Frequently Asked Questions
Can I compare loans with different amounts?
Yes — sometimes lenders offer different amounts based on underwriting. Use this calculator to compare the actual offers you received, even if the amounts differ. The total cost column shows the true out-of-pocket difference.
What if one loan has a prepayment penalty?
A prepayment penalty is charged if you pay off the loan early. This calculator assumes you make standard payments through the full term. If you plan to pay off early, a loan with a prepayment penalty could cost significantly more than one without — factor that in before deciding.
Should I always choose the loan with the lowest total cost?
Not necessarily. If the lower total cost loan has a monthly payment that stretches your budget, missing payments or paying late will cost you more in fees and credit damage than the interest savings are worth. Choose a loan whose monthly payment fits comfortably within your budget.