Inventory Purchases Budget

The inventory purchases budget basically shows the business how much inventory it needs to purchase each period to maintain the required inventory levels, and ensure the availability of products in appropriate quantities and costs to meet anticipated demand.

Inventory Purchases Budget Formula

The inventory purchases budget is calculated using the following formula

Purchases = Cost of sales + Ending inventory - Beginning inventory


Each of the values used in the inventory purchases budget formula can be found from the financial projections template as follows:

  1. Cost of sales is shown on the income statement for the current period.
  2. Ending inventory is shown on the balance sheet for the current period.
  3. Beginning inventory is shown on the balance sheet for the previous period.

Inventory Purchases Budget Example

Suppose for example, the financial projection is showing that cost of sales for the period is 50,000, an ending inventory level of 8,000 and a beginning inventory level of 6,000. Using the inventory purchases budget formula, the purchases required during the period are calculated as follows:

Purchases = Cost of sales + Ending inventory - Beginning inventory
Purchases = 50,000 + 8,000 - 6,000
Purchases = 52,000

This is simply showing that during the period purchases of 52,000 are required in order to be able to sell goods costing 50,000 (cost of sales), and to increase inventory levels by 2,000 from 6,000 (beginning inventory) to 8,000 (ending inventory).

Inventory Purchases Budget and Cash Payments

The inventory purchases budget simply tells the business how much product it needs to purchase in order to satisfy sales demand and maintain inventory levels, it does not tell the business the amount of cash it will need in order to pay for the inventory purchases.

To convert the inventory purchases budget into a cash payments budget, the effect of credit given by trade suppliers needs to be taken into account, this is achieved using the following formula:

Cash payments = Purchases + Beginning accounts payable - Ending accounts payable

It should be noted that in the context of the above formula purchases and accounts payable refer only to those relating to inventory suppliers.

In the above formula, purchases is the inventory purchases budget calculated earlier (52,000), and the values for beginning and ending accounts payable can be found in the balance sheets for the previous and current accounting periods respectively.

To continue our example, if the beginning accounts payable was 5,000 and the ending accounts payable was 7,500, then the cash payments required during the period is calculate as follows:

Cash payments = Purchases + Beginning accounts payable - Ending accounts payable
Cash payments = 52,000 + 5,000 - 7,500
Cash payments = 49,500

The cash payments (49,500) are less that the required inventory purchases budget (52,000), because additional credit (2,500) has been taken from suppliers by increasing accounts payable from 5,000 to 7,500 during the accounting period.

Based on information from the financial projections, the business now knows that if the forecast cost of sales is 50,000, then given the required levels of inventory and accounts payable, it must purchase products to the value of 52,000, and make cash payments of 49,500 during the accounting period.

The benefit of an inventory control purchases budget is that minimizes the working capital and consequently cash invested in inventory, while ensuring that there is enough raw materials, work in process, and finished goods to satisfy production levels and customer demand.

Last modified February 8th, 2019 by Michael Brown

About the Author

Chartered accountant Michael Brown is the founder and CEO of Plan Projections. He has worked as an accountant and consultant for more than 25 years and has built financial models for all types of industries. He has been the CFO or controller of both small and medium sized companies and has run small businesses of his own. He has been a manager and an auditor with Deloitte, a big 4 accountancy firm, and holds a BSc from Loughborough University.

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