When an employer or biller asks you to "prove" your bank account, three documents come up most often: a voided check, a deposit slip, and a bank verification letter. They overlap enough to be confusing, but they are not equivalent — they expose different information, are produced differently, and are accepted in different situations. Send the wrong one and you risk a misrouted deposit or a request to start over. This guide compares all three head to head so you can send the right document the first time.
If you need a refresher on what a voided check is in the first place, start with our explainer on what a voided check is and when you need one. Here we assume you know that and focus purely on the comparison: which document to choose, and why.
What each document is, in one line
All three exist to communicate your routing and account numbers to a payer in a form they can trust. The difference is how that proof is packaged and how authoritative it is.
- Voided check: a real check from your account marked VOID so it cannot be cashed, still showing your name, routing number, and account number in the standardized MICR line at the bottom.
- Deposit slip: the pre-printed slip from the back of a checkbook used to deposit money; it carries account information but sometimes a different internal routing number than a check.
- Bank verification letter: an official letter on bank letterhead stating your name, account number, and routing number — produced by the bank specifically to confirm the account.
Voided check vs. deposit slip vs. bank letter: a comparison
The table below summarizes how the three compare on the dimensions employers and billers actually care about. "Routing number reliability" is the key row: a voided check and a bank letter carry the routing number used for electronic ACH transfers, while a deposit slip's printed routing number is sometimes an internal deposit-only number that can misroute a transfer.
| What it does | Voided check | Deposit slip | Bank verification letter |
|---|---|---|---|
| What it proves | Account ownership plus the exact ACH routing and account numbers, in standard format | An account number and a routing number, but the format varies | Account ownership plus routing and account numbers, on official letterhead |
| Routing number reliability | High — carries the ACH routing number | Lower — may print a deposit-only routing number | High — the bank states the correct numbers |
| Acceptance | Most universal; payroll systems are built around it | Sometimes accepted but commonly discouraged; confirm first | Strong and formal; ideal when you have no checks |
| Cost and effort | Free if you have checks; instant with an online generator if you don't | Free if you have a checkbook | Request from the bank; some charge a small fee or take a day |
| Information exposed | Name, address, routing number, account number | Name, account number, routing number | Name, routing number, account number (no full statement) |
When is a voided check the right choice?
A voided check is the default for a reason: it is the format payroll and billing systems were designed around, it shows account ownership and the correct ACH routing number together, and it is machine-readable. If a form says "attach a voided check," send a voided check. If you have a checkbook, void one; if you bank online and have none, you can create a voided check online that lays your real numbers out in the same standardized format. For the full menu of no-checkbook options, see how to get a voided check without a checkbook.
When does a deposit slip fall short?
A deposit slip seems like an easy substitute — it is right there in the checkbook and shows account numbers. The problem is reliability. As payroll and banking guides repeatedly warn, the routing number pre-printed on a deposit slip is sometimes a different internal number meant only for deposits, not the routing number used for ACH electronic transfers. Some slips also omit information automated systems expect, or present it in a non-standard position. A deposit slip can work, but only if the recipient explicitly accepts one — never assume it. When in doubt, a voided check or bank letter avoids the risk entirely.
When is a bank verification letter best?
A bank verification letter — sometimes called an account-confirmation or bank reference letter — is the strongest formal alternative to a voided check. Because the bank itself states your name and the correct routing and account numbers on letterhead, it carries more authority than a check for situations that demand formal proof: a landlord, an immigration office, a brokerage, or a payroll department that does not issue paper checks. It also avoids oversharing — you confirm only the account details, not a full statement with your balance and transaction history. If this is the route you need, you can prepare a bank account verification letter in the format recipients expect, or request one from your bank.
How to decide in 30 seconds
Work backward from what the requester said and what you have on hand:
- They said "voided check" specifically → send a voided check (void a paper one, or generate one online if you bank app-only).
- You have no checks and want a formal document → request or prepare a bank verification letter.
- They offered a choice and you only have a deposit slip → confirm they accept it; if unsure, use a voided check or letter instead.
- They just need the numbers → type your routing and account number into their form; no document may be required at all.
Whichever you choose, none of these documents authorizes a payment by itself — they only prove your account. You still sign the employer's or biller's enrollment form to start a deposit or autopay. And because each one exposes your routing and account numbers, share it only with a trusted recipient through a secure channel; our guide on whether it is safe to give someone a voided check covers exactly what is at stake.