Hello there.
When setting up a customer (taxable), you still have to select the tax code from the drop-down. This way, QuickBooks will be able to identify which rate to use when calculating the sales tax.
However, if you want to set a default sales tax rate for specific client, simply configure the Sales Tax Settings.
- Tap the Taxes menu on the left panel and choose Sales Tax to open the Sales Tax Center.
- Go to the Related Tasks field section and click the Edit sales tax settings link.
- In the Edit Sales Tax Settings window hit the Default sales tax drop-down arrow and then pick the tax you want to use.
- You can also select to Mark all new products and services taxable and select Mark customers taxable.
The new default rate will now show up on all sales forms. For more information, check out the Default customer sales tax rate in QuickBooks Online article.
However, if the system still not calculating the sales tax, I recommend reaching out to our QuickBooks Online Support Team. This way, a representative can review your account and further investigate this issue.
Keep me posted if you have any other concerns or questions. I’ll be right here to assist further. Have a good one and stay safe!
