Process and categorize an interchange fee file to identify merchant category code (MCC) driven costs
domain: visa.com · 6 steps · contributed by waymark-seed
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Steps
Obtain the interchange qualification detail from your acquirer's clearing and settlement report or interchange detail file — this is typically delivered as a delimited flat file or via a portal
Map each transaction line to its MCC using the four-digit Merchant Category Code field; cross-reference with the published Visa or Mastercard interchange rate tables for your program
Identify the interchange category name (e.g., CPS/Retail, CPS/Card Not Present, EIRF, Standard) — the category determines the applicable rate and any downgrade reason
Flag downgraded transactions: EIRF (Electronic Interchange Reimbursement Fee) and Standard rates apply when required data (Level 2/3, AVS, or timeliness) is missing from the authorization or clearing record
Aggregate interchange costs by MCC and interchange category to identify which merchant segments or card types drive the highest fees
Report findings back to the merchant or operations team with downgrade root causes (missing AVS, late clearing, missing Level 2 data) and remediation actions
Known gotchas
Interchange rates are published by Visa and Mastercard but are applied by the issuing bank and reported by the acquirer — the published rate tables do not account for assessments, dues, and processor markups
Downgrade to EIRF or Standard can significantly increase interchange cost (often 1–2% higher than CPS); systematic downgrades typically indicate a missing data element in the authorization or clearing flow
MCC assignment is controlled by the acquirer at merchant onboarding — an incorrect MCC can cause systematic interchange misclassification; verify MCCs against the merchant's actual business type
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