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It's nice to see a new member here in the Community, @mike185. I'm happy to walk you through setting up a sales tax rate.
First off, let's enable the sales tax using the Automated Sales Tax option.
Once done, you can create Invoices and Sales Receipts that will have a sales tax charged on taxable items.
For additional information, refer to this help article: Set up your sales tax. It includes a quick video tutorial that will guide you through the process.
Here's another link that will help you manage sales tax payments in QuickBooks Online. It guides you in recording, adjusting and deleting sales tax payments in the Sales Tax Center.
Let me know if you have additional questions. We're always delighted to be of your service.