Keeping track of inventory is an essential part of warehouse operations. Every product that enters, leaves, or moves within the warehouse affects the available stock.
As the number of products and transactions increases, keeping inventory records manually can take more time and attention. That is why businesses need a clear process for recording and tracking every inventory transaction.
What Is Inventory Bookkeeping?
Inventory bookkeeping is the process of recording and tracking the quantity of physical goods available in a warehouse. Every inventory movement is recorded to keep track of how much stock comes in, goes out, or remains available.
Transactions can include purchases, goods receipts, sales, stock issues, returns, transfers, production output, material usage, damaged goods, and inventory adjustments. Keeping an accurate record of each transaction helps businesses maintain visibility over inventory levels and track stock movements across the warehouse.
Functions of Inventory Bookkeeping
- Monitor Available Inventory
Keeping track of inventory records helps businesses know how much stock is currently available. Businesses can then use this information to assess whether the available quantity is enough to meet operational needs. - Track Inventory Movements
Inventory levels change as goods are received, issued, transferred, returned, produced, damaged, or adjusted. Recording each transaction helps businesses understand what causes changes in their inventory. - Support Replenishment
Stock records provide information for replenishment decisions based on actual inventory levels and product movement rather than manual estimates. Businesses can identify products that need replenishing and plan the required stock accordingly. - Reduce the Risk of Stockouts
Regular monitoring of inventory levels helps businesses identify products approaching their minimum stock levels. Teams can act before stock runs out and affects order fulfilment or daily operations. - Improve Reporting
All recorded inventory movements can be compiled into reports. These reports give businesses a view of their stock levels and changes over a specific period, making it easier to review inventory.
Inventory Bookkeeping Formula
The basic formula for inventory bookkeeping helps calculate the stock remaining based on changes in inventory:
Ending Stock = Beginning Stock + Stock In - Stock Out
For example, a company has 1,000 units of Product A at the start of the day. During the day, 300 units are received, and 200 units are issued.
The calculation is:
Ending Stock = 1,000 + 300 − 200
Ending Stock = 1,100 units
The formula can be applied easily when dealing with a small number of products and transactions. However, manual inventory management becomes increasingly challenging when a company handles thousands of SKUs, multiple warehouses, frequent transactions, batch numbers, and serial numbers.
Types of Inventory Bookkeeping
Inventory bookkeeping can be divided based on how goods enter, leave, and are stored in the warehouse. The level of detail can also vary depending on product characteristics and warehouse requirements.
- Inbound
Covers transactions that increase the quantity of goods in the warehouse. Common examples include:
- Purchase receipts from suppliers
- Customer returns
- Transfers from other warehouseProduction output
Each receipt should have a related document and a verifiable quantity. In a warehouse that uses a WMS, operators can scan the SKU or barcode during receiving. Once the transaction has been processed according to the required procedures, the system updates the inventory quantity automatically. - Outbound
Activities that decrease the quantity of goods in the warehouse. Examples include:
- Shipments based on Delivery Orders
- Transfers to other warehouses
- Material usage for production
- Damaged goods
- Expired goods - Inventory by Location
Inventory can also be recorded based on its physical location within the warehouse. For example, the system may show 1,000 units of Product A in total, distributed across several locations:
Zone A: 500 units
Zone B: 300 units
Outbound Staging: 200 units - Batch and Expiry Date
Some industries require inventory records beyond SKU and quantity. Food and beverage, pharmaceutical, cosmetic, and chemical products may also need to be tracked by batch number and expiry date.
Batch-level records show which batch each product belongs to and when it expires. The information can also help warehouse teams select the appropriate stock for outbound orders and identify products approaching their expiry date.
Key Inventory Bookkeeping Process
Creating inventory bookkeeping starts with recording every product and tracking each change in inventory. A proper inventory record should cover the entire process, from product registration and stock transactions to reconciliation and reporting.
- Product Master Data
Start by registering every product using a unique SKU, name, category, unit of measure, and other relevant information. Accurate master data helps ensure each transaction is recorded under the correct product. - Record Every Movement
Count the available quantity of each product and record every movement that affects inventory. Transactions may include inbound, returns, putaway, and outbound activities.
Each transaction should be recorded as it happens so the inventory record reflects the latest stock position. - Update Inventory Records After Each Transaction
Update inventory balances as soon as goods enter or leave the warehouse. Delaying the entry can create a gap between the physical stock and the recorded balance, especially when other transactions occur before the previous transaction is recorded. - Reconcile Inventory Regularly
Compare inventory records with physical stock using cycle counting or stock opname. Any difference should be investigated before an inventory adjustment is made.
Start by reviewing the transaction history, including inbound, outbound, transfers, returns, damaged goods, and picking activities. Identify the source of the difference before changing the recorded balance. - Prepare Periodic Reports
Inventory data can also be used to prepare periodic reports. Reports may cover slow-moving products, dead stock, and replenishment requirements.
Reviewing these reports helps teams identify inventory that requires attention and plan the next stock-related actions. - Use a Warehouse Management System
Managing each step manually can become increasingly challenging when the warehouse handles a large number of products and transactions. A Warehouse Management System (WMS) can automate inventory recording, update stock balances, capture warehouse transactions, link inventory data to supporting documents, and generate reports.
A WMS also gives warehouse teams access to current information as transactions are recorded. As a result, many companies use WMS to manage inventory bookkeeping and handle stock records across their warehouse operations.
Manage Inventory Bookkeeping with BOSNET Warehouse Management System (WMS)
BOSNET Warehouse Management System helps businesses manage stock across the warehouse. By automating inventory processes and providing real-time visibility, businesses can identify products faster, track stock movement accurately, and maintain records across multiple warehouse locations.
With its self-correcting system, BOSNET Warehouse Management System automatically updates inventory records based on the latest physical activity, delivering precise data for smarter decision-making and helping FMCG businesses increase revenue and reduce costs.
Contact us to see how BOSNET can efficiently manage your warehouse.
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