Thanks for joining in this thread, @dcaroli. Let's ensure to set your Bills or Expense to inclusive of sales tax so it'll automatically apply when you create a PO or a Bill. 

Here's how: 

1. Go to the Settings (gear icon) at the top right.
2. Select Accounts and Settings, then go to the Advanced tab. 
3. Click into the Accounting section to expand the accounting options.
4. Change the Default tax rate selection to 'Inclusive of Sales tax'
5. Click Save to record the change.

You can also check the specific supplier's details as there is an option to select a default sales tax code for them. If that is selected as Non-tax, then the column would not appear on any transactions to that specific supplier.

I've also added these articles for your future references about Sales GST/VAT in QuickBooks:

• How do I set up sales GST/VAT rates and use them on forms? (International QBO)
• Applying Sales Tax to Transactions and Sales Forms
• Manage a tax rate change

Let me know if you have additional questions about adding sales tax on bills. I'd be happy to get back and help.