I’m here to provide information on why there’s a negative balance in the Inventory, Mandy.
When the quantity on hand is tracked inaccurately, you may get a negative inventory balance. Here's the list that caused negative inventory:
You simply more products than you actually had
You didn't enter all of your purchase orders into QuickBooks
You miscounted your physical inventory so the quantity in QuickBooks is different
The quantity you got from your vendor didn't match the purchase order in QuickBooks. This can cause a miscount
You didn't convert your purchase orders to bills. QuickBooks only counts items as inventory after you create a bill
You can run the Inventory Valuation and Balance Sheet report in QuickBooks Online (QBO) to see the difference. I’ll show you how:
Go to the Reports menu.
Type in/select "Inventory Valuation Detail" in the Search field.
Select All Dates in the Report period.
Hit Run report.
You can export it to Excel to have a better comparison.
Select Back to report list to go back to the report Search field, then enter "Balance Sheet."
Click the necessary information, then press Run report.
Then you can use this information to resolve the negative balance amount: Fix negative inventory issues in QuickBooks Online. This article is for QBO US but is also applicable to other regions. It helps ensure your inventories are well accounted for.