Thanks for getting back to the Community, tjkirk,
I'm here to provide information about recording sales tax payment in QuickBooks Online.
For now, the option to record payment is unavailable if you have no tax owed. To help resolve the problem, you can create a Journal entry for the late filing to adjust liabilities.
For assistance in creating a Journal entry, you may wish to contact your Accountant. They can provide more expert advice about this to make sure your books are recorded correctly.
As always, if you have any other questions, feel free to visit the Community again. Have a great day!