ACH Prenotes Explained: How to Verify Account Information Before Sending Payments
Prenotes (short for prenotifications) are test ACH transactions used to confirm that a bank account and routing number are set up correctly before you send or collect real money.
They don’t move funds. Instead, prenotes help verify that the account exists and can accept ACH payments, reducing errors and surprises when live payments begin.
When Should You Use Prenotes?
Prenotes aren’t required in every situation, but they’re a smart step when accuracy matters. Common use cases include:
- Paying a new vendor by ACH for the first time
- Setting up direct deposit for a new employee
- Updating banking details for an existing vendor or employee
- Switching from checks to ACH payments
- Sending high‑volume or high‑dollar ACH payments
If incorrect account information would cause delays, fees, or operational issues, prenotes are worth the extra step.
How Prenotes Work (Step‑by‑Step)
- Enter the recipient’s bank account and routing number in your ACH system
- Send a prenote instead of a live payment
- The prenote is sent with a $0 amount
- The receiving bank reviews the account details
- Wait at least three business days
- If no return is received, you can begin sending live ACH payments
If a problem is found, the prenote will be returned so you can correct the information before any money is involved.
Key Rules to Know
- Prenotes are optional — they are not required by Nacha rules
- No money moves; prenotes are always sent for $0
- You must wait at least three business days before sending live payments
- If a prenote is returned, the account information must be corrected before retrying
- Prenotes don’t last forever — if account details change or too much time passes, a new prenote should be sent
Your bank may have additional ACH requirements, so it’s important to follow your institution’s guidelines.
Why Prenotes Matter
Skipping prenotes can seem faster, but it increases risk for your business.
- Fraud prevention: Prenotes help catch invalid or suspicious account details early
- Fewer returns: Incorrect payments can lead to ACH returns, fees, and added scrutiny
- Operational efficiency: Fixing errors before payments go live avoids delays, rework, and frustration
Prenotes help protect your business from payment errors that cost time, money, and trust.
