You are currently using Payroll.
Sales tax is added to the base subscription price.
You had promotional discounts that have expired, so you are now being billed the regular price for your subscription.
You recently upgraded from Simple Start/Simple Start to Essentials, or from Essentials to Plus.

You can find more details about charges with these few easy steps:

Sign in to your QuickBooks Online account.
Go to the Gear > Account and settings.
On the left panel, select the Billing & Subscription tab. You’ll see all your active subscriptions.

Please see this sample screenshot as a guide:

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