ACH Prenote vs. Microdeposits: Why Your Bank Account Is Being Verified
Why did a new bank link send tiny credits or a zero-dollar prenote? Learn Nacha account verification rules, ACCTVERIFY entries and how to spot suspicious tests.
Quick answer: An ACH prenotification, or prenote, is a zero-dollar entry used to test account information. ACH micro-entries are small actual credits, typically less than $1, and any permitted offsetting debits used for validation. They are not the same process, and verification does not mean a future transfer has already settled.
Identify whether the bank sent a prenote or a micro-entry
When linking a checking account to an investment platform, billing service, payroll provider or another bank, the service may verify that the routing and account details can be used. A prenotification is a zero-dollar ACH entry; it does not move a customer-facing amount of money in the way a normal credit or debit does. Micro-entries, by contrast, are actual small ACH credits and, where applicable, offsetting debits. Nacha defines micro-entry credits as amounts below $1 used for account validation and prescribes specific identifying information. Seeing a pair of tiny entries is not automatically a direct deposit from a new employer or a merchant's purchase refund.
Suppose an account-linking service tells you to look for two credits of $0.13 and $0.27, then enter those figures into its authenticated portal. This is different from a prenote that has no dollar amount. If a statement displays an unexpected “ACCTVERIFY” description, check whether you recently authorized an external account connection. A malicious actor may also test stolen account numbers, so do not dismiss every micro-entry without review. The verifying company should identify itself, and the bank can help interpret the originator information. Keep account-linking emails and app confirmations securely until the connection is tested.
Understand the ACH rules around small verification entries
Nacha's Micro-Entries rules standardize the use of the company entry description “ACCTVERIFY” and set conditions for related credits and debits. Under Nacha rules, the total value of micro-entry credits must be at least as large as any offsetting micro-entry debits, so that the aggregate verification entries do not result in a net debit to the receiver. That restriction does not mean the receiver has authorized a separate later bill payment. Phase 2 added commercially reasonable fraud-detection obligations for originators using micro-entries, including monitoring forward and returned entries. These rules govern originators and network processing; they do not create a universal right for every consumer to receive verification money at a particular hour.
Prenotes and micro-entries both test account information, but their formats and downstream processing differ. Nacha explains that a prenote has a distinct zero-dollar transaction code while a micro-entry is a live ACH transaction identified in other ways. An originator may use other account-validation methods as well, including commercial validation services. Do not infer from the absence of visible microdeposits that the verification necessarily failed; the service might have used a prenote or other method. Likewise, do not infer from the presence of $0.20 in credits that permission for unlimited future debits was properly established. Account verification and transaction authorization are legally and operationally distinct.
Complete account linking without exposing credentials
Start an external connection from a trusted financial service's website or app and verify that you intended to authorize the relationship. If it uses micro-entries, watch the actual bank ledger and enter only the requested amounts inside the original secure linking workflow. Do not reply to a random SMS with your full account number, banking password or one-time passcode. Some services use secure delegated authentication instead of trial deposits; review what permission the connector receives and whether you can revoke it. A micro-entry alone may show that an account can receive ACH items, not that a specific person owns or is authorized to debit it.
If the expected amounts do not appear, verify the account type, routing number and last few digits before trying again. The originating service may allow a limited retry or may require manual review. Too many guesses can lock the link and delay a legitimate payment. Ask whether old account details from a recent merger or name change are still supported. Some linked accounts prohibit certain debits or credits despite successful small test deposits. After successful validation, confirm the company lists the intended destination and account holder, and check that any actual transfer authorization reflects the amount, frequency and date you approved.
Separate successful validation from a successful payment
Account validation is only one prerequisite for moving money. A later ACH transfer can still return for insufficient funds, a closed account, restrictions, wrong transaction type or a revoked mandate. Do not tell a vendor that its $5,000 invoice was paid because two 10-cent test credits cleared. Request the real payment's initiation date, ACH trace information and receiving-bank confirmation. Likewise, a completed ACH prenote does not reserve money in a checking account or prove the payor will have enough available funds when the actual debit arrives.
For a biller changing its withdrawal account, make sure the previous authorized payment path is canceled as appropriate and the new mandate is explicit. Keep the signed payment authorization separate from the account-validation screenshot. If a company schedules a real debit before you authorize it, report the issue to your financial institution rather than relying on the absence of errors in the prenote. Because settlement is not instantaneous in ordinary ACH, allow sufficient processing time around payroll dates, rent due dates and insurance renewals. Valid routing details reduce one type of failure, but they cannot guarantee that the transfer is legitimate or on time.
Respond when unexpected test entries appear
Unexpected sub-dollar ACH credits or offsetting debits deserve inspection. Ask your bank for the originator information, transaction date and any identifying trace if available. Check whether you or an authorized account user recently connected the account to a brokerage, payment service, loan platform or payroll provider. If nobody recognizes the originator, report the activity promptly and ask the bank about blocking unauthorized future debits and replacing compromised account details when appropriate. Do not send money to an unknown party who claims the test credits were deposited “by mistake.”
Keep the original statement entries and dispute case number. A legitimate micro-entry should not be treated as carte blanche for a later withdrawal; a separate authorized transaction needs its own basis. If the bank or originator describes the validation as a zero-dollar prenote, ask why a visible debit appears, because those are distinct network entries. Review connected-account settings after changing passwords or closing a service. Regularly looking for small unfamiliar ACH activity is valuable because fraud can begin with a tiny test even when the eventual attempted withdrawal is much larger.
Frequently asked questions
Are microdeposits always exactly a few cents? They are sub-dollar ACH credits under the Nacha rule; exact amounts vary.
Does a prenote take money out of my bank account? No. It is a zero-dollar ACH validation entry.
Can a linked account still reject the later payment? Yes. Validation does not guarantee settlement or available funds.
MyBankAnswers Editorial Verdict
ACH account validation should be understood as a routing and eligibility check, not proof that a future payment occurred or that an originator has unlimited authority. A prenote is a zero-dollar entry; micro-entries are small live credits and possible offsetting debits with standardized labeling and risk controls. Confirm a linking request in the service you actually use, monitor the verifying entries and retain the separate actual-payment authorization. Unrecognized ACCTVERIFY activity should prompt originator identification and possible account-security steps. This distinction helps customers avoid two opposite errors: mistaking harmless authorized tests for settled income, and overlooking a criminal's trial entries because the amounts appear too small to matter.