01The note rate and APR answer different questions
The note rate determines interest on the balance. The estimated APR relates the amount financed and the timing of scheduled payments, including entered fees that are finance charges. It is solved from the cash flows; the fee percentage is never simply added to the note rate.
On a $25,000 loan at 7.5% for 60 months with a 5% fee deducted from proceeds, the payment is $500.95, usable cash is $23,750 and estimated APR is 9.69%. Interest is $5,056.92 and borrowing cost — interest plus the fee — is $6,306.92.
Enter the note rate when you itemize fees. Entering a fee-inclusive APR and then adding the same origination fee again can double count cost.
- Deducted: repay the requested note amount, but receive the request minus the fee.
- Financed: receive the requested amount, add the fee to the note and pay interest on it.
- Paid separately: receive the requested amount and keep the note at that amount, but pay the fee in cash at funding.
02A longer term buys payment room, not a cheaper loan
At $25,000 and 8%, a 36-month schedule costs $783.41 a month and $3,202.73 in interest. An 84-month schedule lowers the payment to $389.66 but raises interest to $7,731.05. Neither term is universally right; the payment must fit while the lifetime trade remains visible.
A fixed fee usually has a larger annualized effect on a short loan because the cost is concentrated into fewer payments. Compare APR, total borrowing cost and net cash together rather than treating any one number as a complete ranking.
03Payment frequency and extra principal change the payoff path
Accelerated biweekly means 26 half-monthly payments a year, equivalent to 13 monthly reference payments. Accelerated weekly means 52 quarter-monthly payments, also 13 monthly references. Swiftly converts the monthly note rate to an equivalent periodic rate instead of pretending every cadence compounds identically.
Recurring, yearly and independent lump-sum extras are applied to principal after accrued interest. The scheduled installment stays fixed in this model, so the loan ends earlier. The final row caps both the required payment and extra principal at the amount actually needed.
Check the contract for prepayment penalties and tell the lender to apply extra money to principal. A servicer that merely advances the next due date can produce a different result.
04Compare the cash you need, not just the amount you request
Two offers with the same requested amount can deliver different usable cash when one deducts a fee. The target-cash solver works backward from the amount you need to receive; the target-payment solver works backward from a monthly budget and handles financed flat fees separately.
Offer A/B keeps amount, cadence and extras aligned while changing rate, term and fee treatment. It reports separate leaders for monthly payment and lifetime borrowing cost because those goals often conflict.
05Where this estimate stops
This is a fixed-rate, single-advance model with monthly compounding and equal modeled periods. Estimated APR uses the baseline schedule without extras and includes the actual capped final installment. Weekly and biweekly APR use 52- and 26-period annualization under the actuarial cash-flow method.
Daily simple interest, an odd first period, lender cent rounding, late charges, optional products, taxes, prepayment penalties and fees that are not finance charges are outside the model. The lender disclosure and contract control the actual obligation.