A guide for underwriters at ISOs and Acquirers onboarding MCC 5813 bar and nightclub merchants, covering risk assessment, fraud signals, and the underwriting questions that matter.
If you're underwriting a bar or nightclub, MCC 5813 has elevated chargeback and tip-fraud exposure driven by open tabs, high-volume late-night service, and disputed charges customers do not remember. Add cover charges and bottle service and the risk climbs. Here's what to look for.
Key Information
This guide covers bars, taverns, and nightclubs, where open tabs, tip adjustments, and late-night volume produce some of the highest dispute and internal-fraud rates in hospitality.
Typical Business Types
Neighborhood Bars and Taverns
#1
Local establishments serving drinks with limited food.
Nightclubs and Lounges
#2
High-volume venues with cover charges, bottle service, and events.
Sports Bars and Gastropubs
#3
Venues combining bar service with food and event programming.
Payment Processing Information
Transaction Types
1
Open Tab Authorization
A card held open and settled at the end of the visit.
2
Tip Adjustment
Authorization adjusted upward after a tip is added.
3
Cover Charge
Entry fees collected at the door.
4
Bottle Service
High-value packaged service charged to a single ticket.
5
Mobile and Contactless
Tap-to-pay for quick bar transactions.
Common Payment Methods
Credit and Debit Cards - Primary method for tabs and bar sales
Mobile Payments - Contactless and digital wallets
Cash - Common for small rounds and tips
Reservation and Event Deposits - Prepaid holds for bottle service or events
Gift Cards - Venue stored value applied at checkout
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Tip Fraud - Unauthorized upward changes to tip amounts after the customer leaves
Open Tab Disputes - Customers disputing tab totals they do not recognize
Friendly Fraud - Buyers claiming they never made late-night purchases
Employee Skimming - Staff processing voids or reopening tabs for personal gain
Card-Not-Present Deposit Fraud - Stolen cards used for event or bottle deposits
Regulatory Challenges
Liquor License Compliance - Permits for on-premise alcohol service
Age Verification - ID checks for entry and service
Occupancy and Safety - Fire code and capacity limits
Labor and Tip Reporting - Wage and gratuity reporting rules
PCI Compliance - Payment card data security
Common Fraud Signals
Tip Percentages Above Norm
Tips far above typical levels point to fraudulent post-visit adjustments.
Late-Night Dispute Clusters
Disputes concentrated on weekend late hours suggest tab or memory disputes.
Void and Reopen Spikes by Staff
One employee reopening or voiding tabs frequently signals skimming.
Example Scenarios and Red Flags
Inflated Tip Adjustments
Tip changes well beyond the norm after customers depart.
Open Tab Chargeback Pattern
Repeated disputes on settled tabs claiming unrecognized charges.
Employee Tab Manipulation
Staff reopening or transferring tabs to obscure theft.
Cover and Deposit Card Fraud
Card-not-present deposits on stolen cards that later dispute.
Card Testing at the Bar
Bursts of small approvals and declines during service.
Common Underwriting Questions
UW Tips Business
Verify liquor license and any entertainment or late-hour permits
Confirm occupancy limits and safety compliance
Check the venue is operational and matches records
UW Tips Financial
Assess average ticket size including bottle service and cover
Review weekend and event-driven revenue concentration
Examine seasonal and event calendar effects on volume
UW Tips Risk
Evaluate tip adjustment controls and authorization windows
Assess open tab handling and settlement practices
Review employee void and reopen controls
UW Questions Business
What type of venue do you operate and what hours do you keep?
Do you charge cover or offer bottle service?
Are your liquor and entertainment permits current?
UW Questions Payments
How do you manage open tabs and pre-authorization amounts?
What controls govern tip adjustments after departure?
How are event and bottle deposits collected and refunded?
UW Questions Fraud
What measures prevent employee tab manipulation?
How do you verify large or unusual transactions?
What training do staff receive on payment security?
UW Questions Compliance
Are you PCI compliant and when was your last assessment?
How do you handle tip and wage reporting?
Do you verify age at entry and service consistently?
UW Questions Chargebacks
What is your chargeback ratio and what reasons dominate?
How do you document tabs and authorizations for disputes?
Do you retain signed receipts and tip records?
UW Questions Infrastructure
What POS handles tabs, tips, and bottle service?
How do you secure terminals during high-volume service?
Do you support EMV and contactless at all stations?
Ongoing Monitoring
Transaction Monitoring
Flag tip adjustments above normal thresholds
Track void and reopen activity by employee and shift
Monitor late-night dispute concentration
Compliance Checks
Maintain liquor and entertainment licensing
Keep tip and labor reporting current
Hold PCI assessments current
Security Updates
Use EMV and contactless at all bar stations
Set tip adjustment limits and authorization windows
Encrypt and tokenize stored card data
Risk Assessment
Increase monitoring on weekends and event nights
Track tip and tab dispute trends
Review employee controls and access regularly
Merchant Communication
Help the merchant set tip-adjustment limits and tighten open-tab settlement. Share practices for documenting authorizations to defend disputes. Support employee controls against void and reopen abuse.
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