Banks reuse the phrase overdraft protection for three different products. One is a flat-fee courtesy pay. One is an automatic transfer from savings or another checking. One is a true overdraft line of credit (a small revolving loan tied to the checking account). Confusing them leads people to accept high flat fees when a cheaper structure exists, or to treat a line of credit like free coverage.
This page is a product comparison. For fee traps and opt-in tactics, use How to avoid overdraft protection traps. For short-term credit framing, see Overdraft vs payday loans.
Side-by-side product map
| Product | What happens when you are short | Typical cost | Repayment |
|---|---|---|---|
| Overdraft privilege / courtesy pay | Bank pays the debit/ACH; posts a fee | Flat fee per item (illustrative $10–$35); some banks cap daily items | Next deposits repay the negative balance |
| Overdraft protection transfer | Auto move from savings, second checking, or sometimes a card | Transfer fee ($0–$12 common) and/or card cash-advance pricing | You refill the linked account |
| Overdraft line of credit | Bank advances from a preapproved LOC linked to checking | Interest (APR on the advance) plus possible annual or draw fees | Minimum payments or auto-sweep from deposits |
Named large banks (Chase, Bank of America, Wells Fargo, U.S. Bank) and many credit unions publish these under slightly different labels. Always open the personal fee schedule and the credit agreement for the LOC version.
Cost example with numbers
Sam is $40 short when three small debits post.
| Coverage method | What Sam “borrows” | Cost in this sketch | Notes |
|---|---|---|---|
| Privilege fees ×3 at $28 | $40 of goods | $84 in fees | Fee can exceed the shortfall |
| Savings transfer, $0–$10 fee | $40 from savings | $0–$10 | Only works if savings holds real cash |
| OD line of credit at 18% APR | $40 advance for 10 days | Interest ≈ $0.20 plus any draw fee | Cheap if repaid fast and no big annual fee |
The transfer or LOC can beat privilege fees on small shortfalls. Card-funded “protection” can become cash-advance APR and fees. Read the card agreement before linking a credit card as the backup.
Fee menus in context: Checking account fees.
When each product fits
Privilege / courtesy pay fits almost no one as a plan. Keep opt-in off for one-time debit/ATM if your bank still uses that framework, and rely on alerts plus a checking floor instead.
Savings or second-checking transfer fits when you keep a real buffer in the linked account and the transfer fee is low or $0. Pair with Autopay without overdrafts.
Overdraft line of credit can fit if:
- You are approved for a small LOC (example: $500–$1,000) with a clear APR.
- You repay advances within days, not months.
- The annual or monthly LOC fee does not erase the savings vs privilege fees.
- You will not treat the LOC as permanent spending money.
Build a cash buffer when you can (Emergency fund basics) so you need the LOC less often.
How to tell which one you have
- Open your bank app’s overdraft or “account services” settings.
- Look for language: “courtesy pay,” “transfer from savings,” or “line of credit / overdraft protection loan.”
- Pull the last statement. Flat per-item OD fees point to privilege. Interest charges labeled “OD LOC” or similar point to a credit product.
- Ask secure chat: “Is my backup a fee-based overdraft, a deposit transfer, or a line of credit?” Get the answer in writing.
- If a fee looks wrong, use How to dispute a bank fee.
Checklist
- Name which of the three products your account actually uses.
- Screenshot fee schedule lines for OD, NSF, transfer, and LOC APR/fees.
- Decline debit opt-in if privilege pricing is your only backup.
- Link savings only when it holds cash you will not also overdraw.
- If you keep an OD LOC, calendar repayment within one paycheck.
- Prefer a checking floor over any of the three as the default plan.
Educational only. Not banking or credit advice. Product names, opt-in rules, and APRs vary by institution and change over time.