Continue your simulation with the OneMain loan calculator and learn how the origination fee changes your monthly payment and real cost.
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Result of your simulation
Estimated monthly loan payment
—
for months
Total to repay
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loan amount + interest
Total interest
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interest rate of per month
Monthly payments are calculated as equal fixed amounts, based on the chosen amount, the loan term and an illustrative interest rate. The values are for guidance only.
Illustrative amounts and interest rates. This is not a loan offer or credit approval.
Choose another amountOneMain Financial charges APRs that can reach 35.99% and an origination fee that varies by state, so a quick estimate can be misleading. In this guide you will learn how to calculate the monthly payment, how added and deducted fees change the amount you repay, how APR includes the fee and how different terms affect total cost.
Direct answer: calculate the payment with the amortisation formula on the amount financed, then check whether the fee is added to the loan or taken from the proceeds. For US$10,000 at a 24% interest rate over three years, the payment is approximately US$392, rising to roughly US$412 when a 5% fee is financed into the outstanding balance.
Reviews in 2026 described OneMain origination fees as either a flat amount between about US$25 and US$500 or a percentage between 1% and 10%, depending on state law. Loans have generally ranged from US$1,500 to US$20,000, with repayment terms of 24 to 60 months. There is no prepayment penalty, so paying early reduces total interest.
A frequent error is comparing the interest rate on one offer with the APR on another. Under the Truth in Lending Act, the APR shown in your disclosure includes the origination fee, so it is higher than the simple interest rate. Comparing APR with APR, and total payments with total payments, is the only fair way to judge offers.
Next, you will see the inputs for the calculation, worked examples with fees added and deducted, a table of APRs, the effect of different terms, how secured loans change the numbers, the value of paying early, a comparison with a credit union loan and a checklist. Have your prequalified offer from OneMain nearby so you can test your own figures.
Inputs for the calculation
- Amount requested and amount actually received.
- Interest rate and APR from the disclosure.
- Origination fee: flat or percentage, added or deducted.
- Term between 24 and 60 months.
- Any optional add-on products you are considering.
The base payment
The payment equals P·r/(1−(1+r)^−n). For US$10,000 at 24% over 36 months, r = 0.02 and (1.02)^−36 is about 0.4902, so the payment is 10,000 × 0.02 ÷ 0.5098, or about US$392. Over three years you pay about US$14,120, of which roughly US$4,120 is interest.
When the fee is added to the loan
If a 5% fee of US$500 is financed, P becomes US$10,500 and the payment rises to about US$412. Total payments reach about US$14,830, so the cost of receiving US$10,000 is about US$4,830. The fee itself accrues interest for the full term.
When the fee is deducted from proceeds
If the same fee is taken from the loan, you owe US$10,000 but receive only US$9,500. The payment stays at about US$392, but the true cost is about US$4,620 for the cash you actually received. The effective APR rises to roughly 27.8%, compared with the 24% interest rate.
| Fee treatment | Cash received | Monthly payment | Total cost |
|---|---|---|---|
| No fee | US$10,000 | about US$392 | about US$4,120 |
| 5% added | US$10,000 | about US$412 | about US$4,830 |
| 5% deducted | US$9,500 | about US$392 | about US$4,620 |
Payments across APR levels
| APR (US$10,000, 36 months) | Monthly payment | Total interest |
|---|---|---|
| 18% | about US$362 | about US$3,020 |
| 24% | about US$392 | about US$4,120 |
| 30% | about US$425 | about US$5,280 |
| 35.99% | about US$458 | about US$6,480 |
At the top APR, interest is about sixty-five percent of the amount borrowed. If your offer is in this range, it is worth exploring every alternative, including credit unions, before accepting.
How the term changes the total
| Term at 24% | Monthly payment | Total interest |
|---|---|---|
| 24 months | about US$529 | about US$2,690 |
| 36 months | about US$392 | about US$4,120 |
| 60 months | about US$288 | about US$7,260 |
The five-year option cuts the payment by about US$104 compared with three years but adds over US$3,100 in interest. Choose the shortest term that keeps your budget safe.
Secured loans and lower APRs
Offering a vehicle as collateral may reduce the APR. On US$10,000 over 36 months, moving from 30% to 22% lowers the payment from about US$425 to about US$382 and saves roughly US$1,550. The vehicle must be insured and can be repossessed if you default, so weigh the saving against the risk.
Paying early to save interest
Because OneMain does not charge a prepayment penalty, extra payments reduce the principal and the interest that follows. Adding US$50 per month to the US$392 payment shortens the loan by around five months and saves several hundred dollars. Ask how extra payments are applied before sending them.
Comparing with a credit union
Federal credit unions are generally limited to an 18% APR on most loans. A US$10,000 credit union loan at 15% over 36 months costs about US$347 per month and US$2,480 in interest, far below the OneMain examples. Membership requirements apply, but checking local options is worthwhile.
A worked comparison of two real-world offers
Imagine a prequalified OneMain offer of US$7,000 at 27% APR over 48 months and a credit union offer of US$7,000 at 14% over the same term. The OneMain payment is about US$240 and total interest about US$4,520. The credit union payment is about US$191 and interest about US$2,180. The difference of roughly US$2,340 is large enough to justify joining the credit union.
If the credit union declines you, consider whether a smaller OneMain loan over a shorter term would still meet your need. Borrowing US$5,000 over 36 months at 27% costs about US$204 per month and roughly US$2,350 in interest, a more manageable commitment than the larger loan.
Budgeting for the payment
Subtract the full payment, including any add-ons, from your net monthly income and regular bills. If less than ten percent remains, reduce the amount or shorten the list of expenses before borrowing. A high-APR loan leaves little room for surprises.
Optional add-ons
Optional credit insurance or other products can add to the monthly payment. Ask for the cost of each in dollars, confirm that they are optional and decline any you do not need. Even small monthly charges add up over a multi-year loan.
Calculator checklist
- Confirm whether the fee is added or deducted.
- Compare APRs, not interest rates.
- Calculate total payments for each term.
- Test a secured option only if the risk is acceptable.
- Compare with at least one credit union quote.
Reading the disclosure
The federal Truth in Lending disclosure lists the APR, finance charge, amount financed and total of payments. Compare these four figures with your own simulation. If the amount financed is lower than the loan amount, a fee has been deducted, and the APR will reflect it.
Summary: simulating a OneMain loan
The origination fee and APR level dominate the cost of a OneMain loan. Simulate both fee treatments, compare terms and check alternatives before accepting.
- Use the amortisation formula on the amount financed.
- Account for added or deducted fees.
- Compare APR, which includes the fee.
- Prefer the shortest affordable term.
- Prepay when possible to reduce interest.
Frequently asked questions
Is the origination fee included in the APR?
Yes, the APR disclosed under federal law includes finance charges such as the origination fee.
Can I avoid the origination fee?
Fees depend on state rules, so ask what applies where you live before applying.
Does OneMain charge for paying off early?
Reviews indicate there is no prepayment penalty.
Conclusion
Using the OneMain loan calculator well means looking past the monthly figure. Check how the origination fee is handled, compare APRs and total payments, consider the risks of collateral and compare with a credit union before signing, so you choose the loan with the lowest real cost.