How do you go back to manually calculating your own sales tax on invoices?

Hello there, @nwteamex.

At this time, QuickBooks Online is now using the new automated sales tax center. You can consider overwriting the sales tax amount from the invoice transactions. 

Here's how:

1. Open an invoice.
2. Fill up the invoice information and click on the Sales tax link (with blue highlights).
3. In the Tax Categories and Totals section, click on Override this amount.
4. Enter the tax rate and reason.
5. Click on Confirm override.
6. Click on Close.

For future reference, I suggest visiting the Switch to Automated Sales Tax article. It contains important notes about Automated Sales Tax.

I've also added an article about recording and managing your sales tax payments.

We'll be around if you have other questions.