A payday loan is closed-end, single-repayment credit: one lump sum, one fixed fee, one due date tied to your next paycheck. It is not an installment loan and it is not a revolving line, and the distinction is more than paperwork. Structure decides how cost is measured, whether paying early saves you anything, and what reaches your credit file. Here are the three structures and the gray zone between them.
The three structures
Closed-end single-repayment. The loan is disbursed once and repaid once. A payday loan or cash advance of $100 to $1,000 carries a fee of $10 to $30 per $100, with 15% typical, and is collected in a single ACH debit on your next payday. There is no schedule to follow because there is only one date.
Closed-end installment. The loan is disbursed once and repaid on a fixed schedule of amortized payments. Each payment covers that period’s interest plus a slice of principal, so the balance declines to zero on a known date. On our network, installment loans run $100 to $5,000 over 3 to 24 months, with APRs from 6.63% to 225% depending on the lender and the state.
Revolving. A credit card or line of credit stays open. You borrow, repay, and borrow again without a new application, there is no scheduled end date, and interest accrues on whatever balance you carry. Because the account never closes, the cost has no ceiling except your limit and your discipline, and minimum payments can keep a balance alive for years.
Why the label changes the cost
Fee versus APR. A flat fee is easy to read and easy to misread. Fifteen dollars per $100 for two weeks sounds modest; annualized, that rate is roughly 391% APR. Installment lenders must disclose an APR up front because their terms vary in length, which makes APR the common currency for comparing anything longer than one pay period. Lenders tend to quote whichever number flatters the product; comparing a two-week fee to a six-month APR without converting units is the most common cost mistake in this market.
Prepayment. Pay a payday loan two days early and the fee is unchanged; the fee prices the advance, not the days you hold it. Pay an installment loan early and you skip the remaining interest, because interest accrues on a declining balance. Pay down a revolving balance and the interest on what you cleared stops immediately. The same disciplined action has three different payoffs across the three structures.
Credit reporting. Many single-repayment lenders, and most app-based advance products, do not report on-time repayment to the bureaus, so these loans build no payment history even when paid exactly as agreed. A single-repayment advance that goes unpaid still lands as a collections entry, which is the worst of both worlds: no positive history when paid, a negative record when not. Installment loans normally report every payment, which is why they can help a thin file when paid on schedule. Revolving utilization, the share of your credit line in use, is one of the largest score factors, so a card near its limit can cost more score than a larger installment loan.
The gray zone between the labels
Some licensed payday lenders offer flex or multi-payment versions that split repayment into two to four installments: still closed-end, no longer single-repayment, and priced under different state rules. Tribal installment loans are genuine installments: $300 to $2,500, up to $3,500 with some lenders, repaid over 3 to 12 months at 400% to 800% APR by lenders chartered by federally recognized tribes. State rate caps generally do not reach those loans, but federal law does: truth-in-lending disclosure, CFPB oversight, the E-Sign Act, and a 36% APR cap for servicemembers under the Military Lending Act. App-based cash advances are the small cousins of payday: single-repayment advances funded by tips and subscription charges rather than a fee per $100. When an offer is labeled loosely, ask two questions: how many times money leaves your account, and whether the price is a fee or an APR.
Structures side by side
The same $300 shortfall prices very differently across structures:
| Structure | Repayment | Cost unit | Example |
|---|---|---|---|
| Closed-end single repayment | One lump sum, one due date | Fixed fee per $100 borrowed | $300 payday loan: $45 fee at 15%, collected with one debit in 14 days |
| Closed-end installment | Amortized payments over a set term | APR on a declining balance | $1,000 installment loan over 6 months, paid monthly until zero |
| Revolving | Open-ended; minimum payments | Interest on the running balance | Credit card: borrow, repay, borrow again with no end date |
Choosing by structure, not by habit
If the shortfall is a one-time gap to payday and the fee is disclosed in writing, single-repayment math is at least simple: know the fee, know the date. If the need is larger or repayment needs spreading, an installment loan gives you a schedule and an APR you can actually compare, and our tribal loans overview explains the charter-based version of that product. For how collateral changes the same picture, read is a payday loan secured or unsecured. And if a quoted price arrives without a schedule or a cost unit attached, treat that as a reason to keep shopping; how we present costs is described in our disclosure.