A $100 loan is the smallest advance most lenders bother to issue, and it is also the amount where the cheap routes usually win. At this size the fee gap between routes is the whole decision: $15 to a payday lender, a few dollars of tip to a cash advance app, under $5 of interest on a credit union loan that formally starts at $200. Nothing about $100 is complicated. The work is picking the right route before the bill is due.
Same-day reality
| When approved | When money lands |
|---|---|
| Cash advance app, minutes to a few hours | Minutes with an instant transfer for a small fee, 1-3 business days on a standard transfer |
| Storefront payday loan, under an hour | Cash in hand at the counter the same day |
| Online payday loan | Same day at some lenders, next business day at most |
| Credit union PAL | 1-2 business days, after membership is opened |
What $100 actually costs
| Route | Cost for $100 | The catch |
|---|---|---|
| App advance | $0 required, tip $0-$10, optional subscription $0-$20 a month | First advances are often capped below $100 |
| Credit union PAL | Under $5 for a month at the 28% APR cap | Minimum is $200, so exactly $100 does not qualify |
| State payday loan | $15 at the typical 15% fee | Repay $115 in one debit about 14 days later, roughly 391% APR |
Payday fees are priced per $100 borrowed, and state caps run from about $10 to $30 per $100. Fifteen percent is the most common figure, which is why $15 shows up in every fee example. The full $115 leaves your checking account in one debit on your next payday.
Where to get $100, in order
Cash advance apps come first because their limits run from $20 to $700 and a one-time $100 draw usually costs nothing but an optional tip. Eligibility is built on banking history: most apps want a checking account in good standing and an incoming direct deposit. If the app only offers $50 today, that is still $50 at close to zero cost, and the limit typically grows with use.
Credit unions are the second stop, with one wrinkle: federal PALs start at $200. If $200 of breathing room fits your budget better than $100 does, the 28% APR cap makes it the cheapest regulated credit in this market. You have to join the credit union first, which means a small share deposit and a basic eligibility check.
Payday lenders are the third stop. A storefront hands over $100 minus a $15 fee in about fifteen minutes, and online lenders fund the same amount to a bank account, sometimes the same day. You are paying the full 15% for speed and availability, which is a fair price when the cheaper routes are closed and the bill is due today, and an expensive one when they are not.
When payday wins at this size
The payday route earns its fee in three situations: no app will approve you yet, since new users commonly see limits of $20-$50; there is no credit union membership in place and no time to open one; or you need physical cash within the hour. A licensed lender verifies income and an open checking account with a soft inquiry rather than a hard credit pull, and most states want to see roughly $1,000 a month in income. If you have no bank account at all, the options narrow sharply; see our no-bank-account guide.
Being honest about “free” app advances
A tip is voluntary, but the business model counts on you paying it repeatedly. Borrow $100 monthly for a year with an $8 tip each time and you have paid $96, close to six consecutive payday fees. Flat subscriptions are worse for light users: $20 a month for two advances a year works out to $120 for $200 of credit. Used once or twice, apps are the cheapest $100 in this market. Used as a monthly habit, they are not free.
If $100 will not cover it
Borrowing $100 twice means two fees, so if the real problem is bigger, price it once: the $200 version or the $300 workhorse. And if this is the third month in a row the budget has come up short, a one-debit loan will not fix it. The ranked options in our alternatives guide start with routes that cost less than any of the above.