Hi, I would like to undo the past GST filed. Pls assist as soon as possible.

Hi there, @Kyi Kyi. 

Thanks for visiting the Community today for your taxes concerns. To give you an insight, we're unable to remove or unfile your filed tax return in QuickBooks. 

For further assistance, you'll need to contact our Customer Care team.

Here's how:

1. In QBO, click the Help icon at the top right.
2. In QB Assistant, enter your concern as "Unfile GST." 
3. Select Contact Us, then select Start a chat with a support expert. Live chat is available from M-F, 24 hours, GMT.

For more insights about managing GST in QBO, I suggest checking out these articles:

• FAQ for GST in QuickBooks Online.
• File and pay Tax/GST.

You can always get back here if you need anything else. I'll be glad to attend to your next posts.