2.3 Source Documentation and Cost Data Collection

Source Documentation and Cost Data Collection

1. The Role of Source Documents in Cost Recording

Every figure that appears on a job cost sheet, budget variance statement, or departmental cost report originates from a source document. A source document is an official paper or electronic record providing objective evidence of a transaction, verifying its occurrence, authorization, physical quantities, and monetary value.

In management accounting, source documents serve three critical functions:

1. Data Collection: They capture operational facts (hours worked, units delivered, kilograms issued) at the exact point of activity.
2. Managerial Authorisation: They enforce internal controls by ensuring that company assets (inventory, cash, payroll funds) are only committed upon formal approval by designated managers.
3. Audit Trail: They create an unbroken chain of verifiable evidence connecting physical shop-floor movements to ledger accounts and financial summaries.

Management accounting tracks costs across three foundational elements: materials, labour, and expenses.

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2. Material Cost Documentation Flow

Managing raw materials requires an orderly sequence of documents to track goods from initial requisition through purchasing, receiving, storage, and issue to the production line.

Step-by-Step Material Documentation Cycle

1. Purchase Requisition:
   • Raised by: The storekeeper or production supervisor when stock levels drop to the reorder point.
   • Purpose: An internal request asking the purchasing department to buy specified goods. It does not place an order with an external vendor.
2. Purchase Order (PO):
   • Raised by: The purchasing department.
   • Purpose: Sent to an external supplier, placing a formal, legally binding order specifying item descriptions, quantities, agreed prices, delivery dates, and payment terms. Copies are retained internally by purchasing, goods receiving, and accounts payable.
3. Delivery Note (Advice Note):
   • Raised by: The external supplier.
   • Purpose: Accompanies the delivery vehicle. The receiving bay checks physical packages against the delivery note before signing acceptance.
4. Goods Received Note (GRN):
   • Raised by: The Goods Inward (Receiving) department.
   • Purpose: Records that the goods have been inspected for quality, undamaged condition, and correct quantity. The GRN authorizes the storekeeper to take goods into physical stock and provides finance with proof of receipt.
5. Materials Requisition Note (MRN):
   • Raised by: A production supervisor or job leader.
   • Purpose: Authorizes the storekeeper to issue specified materials from the warehouse to a designated job or cost centre. The MRN provides the cost accountant with the basis for charging direct material costs to the job.
6. Materials Returned Note:
   • Raised by: The production department.
   • Purpose: Accompanies surplus, unused, or defective materials returned from the production floor back to stores. It credits the job originally charged and restores warehouse inventory balances.
7. Materials Transfer Note:
   • Raised by: The transferring production supervisor.
   • Purpose: Used when materials issued to one job (e.g. Job 101) are moved directly to another job (e.g. Job 102) on the factory floor without returning to stores. It ensures costs are transferred correctly in the cost ledger, preventing distorted job costing.

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3. Physical Inventory Records: Stores Ledger Account vs Bin Card

A key distinction in inventory recording is between a bin card and a stores ledger account (stores ledger card). While both monitor stock movements, their location, custodian, and recorded data differ fundamentally:

Because bin cards and stores ledger accounts are maintained independently by different personnel, periodic reconciliation between them serves as an essential internal control check.

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4. Labour Cost Documentation and Data Collection

Unlike materials, labour cannot be stored in inventory. If an operative is idle for an hour, that capacity is lost forever. Management accounting systems must therefore capture two separate dimensions of labour: attendance time (hours present at work) and productive time (how those hours were spent on specific jobs or overhead activities).

1. Attendance Records (Recording Presence and Total Time)

• Clock Cards / Electronic Badge Swipes / Biometric Scanners:
  • Record the exact timestamp when an employee enters and leaves the business premises.
  • Used primarily by the payroll department to calculate gross basic wages, overtime payments, shift premiums, and statutory deductions.
  • Limitation: Attendance records verify only that an employee was on site; they do not show which jobs were worked on or whether the time was productive.

2. Operational Activity Records (Allocating Labour to Cost Objects)

• Timesheets:
  • Completed daily or weekly by employees in service environments (e.g. accounting practices, legal firms, IT repair centres) or maintenance crews.
  • Detail the specific hours dedicated to client codes, maintenance tasks, or administration.
  • Form the basis for client invoicing and productivity analysis.
• Job Cards (Job Tickets):
  • Travel alongside a physical production order as it moves across various factory workstations.
  • Operatives log their employee ID, start time, finish time, and units completed on that specific job.
  • Enable the cost department to charge direct labour costs to specific job numbers.
• Piecework Tickets (Piecework Vouchers):
  • Used in output-based wage systems where workers are paid a fixed rate per unit produced rather than an hourly wage.
  • A quality inspector or supervisor checks the work and signs the ticket, verifying the count of acceptable units before submission to payroll.
• Idle Time Record Sheets:
  • Log non-productive hours caused by machinery breakdowns, material shortages, or power failures.
  • Ensure that unproductive wages are charged as indirect production overheads rather than being treated as direct labour on a job.

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5. Expense Documentation

Direct and indirect expenses must be supported by valid documentation before expenditure is approved:

• Supplier Invoices: Invoices from external providers for services such as equipment hire, sub-contracted fabrication, or building maintenance.
• Petty Cash Vouchers: Used for small, immediate cash payments (e.g. emergency consumables, local courier fares). Must be supported by attached receipts and approved by an authorized manager.
• Employee Expense Claim Forms: Submitted by staff to claim reimbursement for approved business travel, hotel stays, or customer entertainment.
• Utility Logs and Meter Readings: Factory meter logs for electricity, water, and gas, utilized to apportion utility expenses across factory cost centres based on floor area or machine kilowatt ratings.

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6. Internal Control Systems and Source Documentation

A cost recording system is vulnerable to fraud, theft, and clerical error unless supported by rigorous internal controls:

1. Three-Way Matching

To ensure that payments are only made for valid business purchases, the accounts payable team executes a three-way match prior to paying a supplier invoice:

1. Purchase Order: Confirms that the goods were officially approved and ordered at contracted prices.
2. Goods Received Note (GRN): Confirms that the goods were physically received in good condition and correct quantity.
3. Supplier Invoice: Confirms that the supplier is billing only for the items and quantities ordered and delivered.

If the supplier bills for 500 units, but the GRN shows that only 450 units arrived, the invoice is placed on hold until a credit note is issued.

2. Segregation of Duties

Critical operational functions must be divided among different employees:

• The individual who authorises a purchase (department manager) must not be the person who places the order (purchasing buyer).
• The person who receives physical goods (stores clerk) must not be the person who processes supplier invoices (accounts payable clerk).
• The storekeeper who updates bin cards must not maintain the stores ledger accounts in the finance office.

3. Sequential Pre-Numbering

All key documents—Purchase Requisitions, Purchase Orders, GRNs, Materials Requisitions, and Cheques—must be sequentially pre-numbered by the system. Any break in the numerical sequence alerts auditors to missing, destroyed, or fraudulent documents.