This article walks through the steps to setting up an inventory forecast using either the DIO or Inventory Turnover option.
Option 1: Days Inventory Outstanding (DIO)
Step 1: Calculate Daily COGS
Step 2: Set Up the Days Inventory Assumption
Step 3: Configure Balance Sheet Drivers
Step 1: Calculate Daily COGS
- Navigate to Custom Tables and create a new line called "Inventory COGS".
- Add a custom driver for inventory calculation:
- If all COGS accounts apply, select "COGS - All".
- If only certain COGS accounts apply, select the relevant COGS accounts or rollups.
- Multiple drivers may be required depending on the chart of accounts structure.
- Create another custom line called "Daily COGS".
- Add a custom driver with the formula:
- Inventory COGS ÷ 30 (to calculate daily values).
Step 2: Set Up the Days Inventory Assumption
- Navigate to Settings > Assumptions.
- Create a new assumption account called "Days Inventory".
- If Days Inventory needs to vary by month: Instead of an assumption account, create a custom table line to enter values manually.
Step 3: Configure Balance Sheet Drivers
- Navigate to the Drivers Button on the right panel.
- Scroll down to the Balance Sheet section.
- This method requires two drivers to forecast inventory balances:
Driver 1: Increase Driver
- Multiplies Daily COGS by the Days Inventory Assumption to calculate the inventory balance for each forecasted month.
Driver 2: Decrease Driver
- Reduces the Inventory Account by the prior month's balance to ensure accurate month-to-month forecasting.
Option 2: Inventory Turnover Ratio
Step 1: Calculate Inventory Turnover Ratio
Step 2: Configure Balance Sheet Drivers
Step 1: Calculate Inventory Turnover Ratio
- Create a custom table line named "Inventory Turnover Ratio".
- Add a Global Driver with the formula:
- COGS ÷ Average Inventory (between last month and this month).
- Apply this driver to actuals using a date range from min date to cutover date.
- Create a Periodic Growth Driver in the same table to calculate a trailing average for the Inventory Turnover Ratio.
- A longer range (e.g., 12 months) smooths out fluctuations.
- A shorter range (e.g., 3 months) captures more recent trends.
Step 2: Configure Balance Sheet Drivers
- Navigate to the Drivers Button > Balance Sheet Section.
- Since this methodology targets a monthly balance, two drivers are required:
Driver 1: Increase Driver
- Multiplies the trended Inventory Turnover Ratio by the COGS for the current month.
- Ensure the correct COGS rollups are selected.
- Adjust for any chart of accounts changes or use multiple drivers if necessary.
Driver 2: Decrease Driver
- Reduces the Inventory Account by the prior month's balance to maintain an accurate forecasted balance.