How can I delete a filled tax quickbooks online

Hi there, @crm-retailbig-ne.

I'll help you take care of this so you can delete filed tax in QuickBooks Online. 

Deleting filed tax isn't available at this time, so I'd suggest calling our Customer Care support. They have tools to undo the filling and open it up for you to make changes.

Before contacting them, please prepare your QBO company ID and tax filing period you wish to delete. To get your Business ID No., directly go to the Gear icon, then choose Account and Settings, and select Company. 

Here's how to reach them:

1. Select the Help icon at the top, then choose Contact Us. 
2. Type your concern in the description field, then hit Let's Talk. 
3. Then connect with a live support agent.

You can refer to this article for more detailed information about the support we offer at Intuit and its availability: Support hours and types.

Additionally, to learn more about the unfiling process, kindly refer to this article: How to unfile VAT/GST.

Please browse through this article: Tax for QuickBooks Online. This link carries information about filing, paying taxes, and managing tax rates. 

Please don't hesitate to visit us again here in the Community if you have other concerns. I'm always ready to help. More power to your business.