An installment loan is a fixed sum of money repaid in equal payments over a set period. You agree the amount, the rate and the number of payments up front, and none of them change. A car loan and a mortgage are installment loans. So is the $2,000 personal loan someone takes to cover a boiler replacement.
Written by the Loan For Any Purpose USA lending team. Reviewed by the Loan For Any Purpose Editorial Review Team. Last reviewed September 10, 2026. We explain products we do not sell as well as the ones we do.
How the payments are built
Each payment covers the interest that accrued since the last one, and whatever is left reduces the principal. Because interest is charged on the balance you still owe, the interest share of each payment shrinks over time while the principal share grows. This is called amortisation.
On a $2,000 loan at 99% APR over 12 months, the payment is $268.84. The first payment includes about $165 of interest; the last includes about $20. The payment never changes, only its composition.
| Payment | Interest | Principal | Balance after |
|---|---|---|---|
| 1 | $165.00 | $103.84 | $1,896.16 |
| 6 | $114.49 | $154.35 | $1,233.44 |
| 12 | $20.49 | $248.35 | $0.00 |
Try any combination in the installment loan calculator.
How it differs from other credit
| Installment loan | Credit card | Payday loan | |
|---|---|---|---|
| Amount | Fixed at the start | Revolving limit | Fixed, small |
| Payment | Same every month | Varies with balance | One payment |
| End date | Known on day one | None | Next payday |
| Interest basis | Declining balance | Daily on balance carried | Flat fee |
| Can the balance grow? | No | Yes | Only if renewed |
The end date is the practical difference. A credit card lets you pay a minimum forever; an installment loan forces the balance down every month and closes itself.
What drives the total cost
- The APR, which bundles interest and required fees into one annual figure.
- The term. A longer term always means more total interest even though the payment is lower.
- The origination fee, if any, usually deducted from the amount funded rather than billed separately.
- Extra payments, which reduce the balance immediately and therefore every future interest charge.
Effect on your credit
Installment loans are reported as closed-end accounts. They do not affect credit utilisation the way a card does, and a completed loan leaves a record of consistent payments, which is what a thin file lacks most. Missed payments are reported too. More detail in how loans affect your credit score.
Where we fit
We offer installment loans of $500 to $5,000 over 3 to 24 months, and personal loans of $1,000 to $5,000 at lower APRs for fair credit and above. Neither carries a prepayment penalty.
Frequently asked questions
What is an installment loan in simple terms?
A fixed sum of money you repay in equal payments over a set number of months. The amount, the rate and the number of payments are all agreed before you sign and none of them change.
What is the difference between an installment loan and a line of credit?
An installment loan is closed-end: you receive the whole amount at once and repay it to zero. A line of credit is revolving, so you can draw, repay and draw again, and there is no fixed end date.
Do installment loans have fixed payments?
Yes. The payment is the same every month. What changes is the split between interest and principal: early payments are weighted toward interest, later ones toward principal.
Is a longer installment loan term better?
It lowers the monthly payment but raises the total interest. Choose the shortest term whose payment you can sustain after rent, food and existing commitments.
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