How can I add tax to bills from vendors?

Hello @newerapoolservic,

As of the moment, there isn't an integrated way to enter taxes on your bills and purchases in QuickBooks Online.

With this, I'd recommend contacting your accountant for guidance in choosing the account you wish to associate with taxes on your bills. If you haven't yet, here's a link you can use to find a bookkeeper near you: Business is better with a ProAdvisor.

Also, I have here a compilation of references you can use to help you with any QuickBooks tasks and navigate them easily.

Keep me updated in the comments if you have any other questions. Stay safe!

Is there a way to add a "Sales Tax" or "Tax" column when creating a vendor bill?

@Jorjie 

Out of curiosity, why do you want a separate entry for sales tax charged by a vendor?  Sales tax paid to a vendor is part of the expense and can just be added to the cost of whatever you purchased.  If you purchase $150 in supplies ($157.50 with tax), just enter $157.50 under supplies expense.