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QuickBooks will mark your tax return as Mark as filed after submitting it.
You'll need to contact the QuickBooks Chat Support Team to unfile a tax return. Just make sure you have this information ready so they can unfile it for you:
Here's how to get your company ID:
Let me also share these additional articles about collecting and managing taxes or VAT in QBO:
As always. don't hesitate to reach out to us again if you need anything else.