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I'd be delighted to take care of canceling tax filing. Since we're unable to pull up your account to this public forum, I encourage you to contact our Customer Support team.
From there, they'll ask for your info and use their tools to review your account and cancel the filing.
You can utilize the Help menu in your QuickBooks account to contact them. Here's how:
Also, you can chat with us depending on the payroll service you're using:
In case you need to cancel a tax payment that hasn't been processed yet, see this article for reference: Delete a tax payment.
Feel free to leave a comment if you need further assistance with QuickBooks Online Payroll. I'll be happy to lend you a hand. Stay safe!