Standard Operating Procedure: Accounts Payable (AP) Lifecycle

This Standard Operating Procedure (SOP) outlines the standardized process for managing the end-to-end accounts payable cycle, from invoice receipt to final payment disbursement. The objective of this procedure is to ensure financial accuracy, maintain robust internal controls, prevent fraudulent disbursements, and optimize cash flow by ensuring timely payments to vendors. Adherence to these steps is mandatory for all members of the finance team to ensure audit readiness and compliance with corporate accounting policies.

1. Invoice Receipt and Verification

• Centralized Intake: Ensure all invoices are received through the dedicated AP email inbox or designated vendor portal. Avoid accepting physical invoices unless strictly necessary.
• Initial Review: Verify the invoice includes a valid Purchase Order (PO) number, vendor contact information, unique invoice number, date, and tax identification details.
• Three-Way Matching: Cross-reference the invoice against the original Purchase Order and the Goods Receipt Note (GRN) or Packing Slip.
• Discrepancy Handling: If the quantities or prices do not match, place the invoice in a "Pending" status and notify the procurement department immediately.

2. Coding and Data Entry

• General Ledger (GL) Coding: Assign the appropriate GL account code based on the nature of the expense. Refer to the Chart of Accounts to ensure consistency.
• Departmental Allocation: Assign the expense to the correct cost center or project code.
• Data Entry: Input the invoice details into the ERP/Accounting system exactly as presented on the document.
• Audit Trail: Attach a digital copy of the invoice and all supporting documentation (PO and GRN) to the entry in the accounting system.

3. Approval Workflow

• Routing: Submit the invoice for electronic approval based on the established Delegation of Authority (DOA) matrix.
• Approval Verification: Ensure the department head or budget holder has reviewed the expense for validity and budget availability.
• Escalation: If an invoice remains unapproved for more than three business days, send a automated reminder to the approver.

4. Payment Processing

• Payment Run Scheduling: Execute payment runs on a set schedule (e.g., weekly on Thursdays) to maintain consistent cash flow visibility.
• Payment Method Selection: Prioritize electronic payments (ACH/Wire) over physical checks for security and speed.
• Final Review: The AP Manager must perform a final sign-off on the "Payment Batch Report" before funds are released.
• Remittance: Once payment is issued, ensure a remittance advice is sent to the vendor via the ERP system.

5. Month-End Reconciliation

• Statement Reconciliation: Compare vendor statements against the AP sub-ledger to identify missing invoices or duplicate payments.
• Accruals: Identify and record expenses incurred but not yet invoiced to ensure accurate period-end financial reporting.
• Aging Analysis: Review the AP Aging Report to identify outstanding liabilities and resolve any long-standing credits or disputes.

Pro Tips & Pitfalls

• Pro Tip: Automate OCR: Use Optical Character Recognition (OCR) software to scan invoices; this reduces manual data entry errors by up to 80%.
• Pro Tip: Vendor Self-Service: Implement a vendor portal where suppliers can check the status of their own invoices to reduce email inquiries.
• Pitfall: Duplicate Payments: Failing to check for duplicate invoice numbers is the most common cause of AP leakage. Use system validation rules to block duplicate invoice numbers per vendor.
• Pitfall: Poor Segregation of Duties: Never allow the same person who sets up a new vendor to also approve invoices and process payments. This is a significant fraud risk.

Frequently Asked Questions (FAQ)

Q: What should I do if an invoice is missing a Purchase Order? A: Follow the "Non-PO Invoice" procedure. Flag the invoice for the relevant department head to provide a cost center code and written authorization for the expense before entering it into the system.

Q: How do we handle discrepancies in price between the PO and the Invoice? A: You must contact the procurement team to verify if a price change was authorized. Do not pay the invoice until either a Change Order (CO) is processed or the vendor issues a credit note to match the PO price.

Q: How often should we review the vendor master file? A: You should conduct a comprehensive review of the vendor master file every six months to deactivate inactive vendors and check for duplicate vendor records or suspicious banking details.