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Positive Pay: A Step‑by‑Step Guide to Preventing Payment Fraud for Your Business

February 23, 2026

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Businesses face growing threats from both check fraud and unauthorized ACH transactions. Criminals can alter checks, create counterfeits, or initiate fraudulent electronic withdrawals—putting company funds at major risk. Positive Pay was created to stop these losses before they happen by verifying each check and controlling which ACH debits are allowed. Positive Pay gives business owners stronger protection, tighter payment control, and greater peace of mind.

What is Business Positive Pay?

Business Positive Pay is a service that verifies that payments are authorized before they leave your account, helping businesses reduce check and ACH fraud, prevent financial loss, and improve payment security. An automated, easy-to-use system flags and alerts businesses if an amount doesn’t match, allowing businesses to reject inaccurate or fraudulent payments before money leaves the account. Although there is a fee for the service, businesses can potentially save thousands of dollars from even one failed fraud attempt.

Key Benefits of Positive Pay:

  • Prevents check fraud by blocking altered, counterfeit, or duplicate checks.
  • Stops unauthorized ACH debits when paired with ACH filters or blocks.
  • Gives you control over which payments clear your account.
  • Reduces financial losses by catching suspicious items before money leaves.
  • Strengthens internal controls and supports audit/compliance requirements.
  • Speeds up fraud detection with real-time exception alerts.
  • Improves cashflow accuracy because only verified payments post.
  • Provides peace of mind knowing your disbursements are protected.

How Positive Pay Works

How Positive Pay Works ~ 1: Company issues checks/ACH - 2: Company uploads check/ACH information - 3: RCU flags unmatched checks/ACH - 4: Company pays or rejects pending payments

How does it work?

How Positive Pay works for checks:

  1. Set up the service
    Enroll your business in check Positive Pay with RCU and select file format, cut off times, and user access.
  2. Issue checks and upload a file
    Write checks as usual, then upload an "issued check" file to RCU with check numbers, dates, amounts, and sometimes, payees.
  3. RCU receives checks for payment
    When a check is presented at a branch, ATM, or through clearing, our system compares it to your uploaded check file.
  4. System matches or flags items
    • Match: If the check number, amount, and other details line up —the check is paid.
    • No match or missing from file: The item becomes an “exception” and is held for your review.
  5. Review your exceptions
    Log in to your online banking portal, see the exception items, and choose to pay or return each one before the deadline.
  6. RCU processes your decisions
    Approved checks are paid; rejected ones are returned unpaid, helping block counterfeit, altered, or unauthorized checks.

How ACH Positive Pay works:

  1. Define your ACH rules
    Work with RCU to set up ACH filters/blocks—such as allowed companies (originators), dollar limits, or blocking all debits except approved ones.
  2. ACH transactions hit your account
    When an ACH debit request comes in, our system checks it against your rules (e.g., “Is this from an approved vendor?” “Is it under the limit?”).
  3. System allows or flags items
    • Allowed: If the transaction fits your rules, it posts to your account.
    • Not allowed: It’s flagged as an exception or automatically blocked, depending on how you set it up.
  4. Review ACH exceptions (if enabled)
    For flagged items, you can log in and decide whether to approve a one time payment or reject it.
  5. Final posting or return
    Approved exceptions post to your account; rejected ones are returned, helping prevent unauthorized electronic withdrawals.

Fraud moves fast, but Positive Pay moves faster

By matching every check and ACH debit against what you authorize, Positive Pay stops counterfeit checks, altered payments, and unauthorized withdrawals before they hit your account. It’s one of the simplest, most effective ways to protect your cash and keep your business a step ahead of fraud.

To learn more about how Business Positive Pay can help safeguard your business, contact us today at (707) 576‑5070 option 4 or visit redwoodcu.org/positive-pay.

Business must apply for and be granted access to Positive Pay services. Additional fees may apply. Certain restrictions and fees may apply. Service is not guaranteed to prevent or detect fraud.

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