Hi there, usersonal-nigam.
The information shown on the VAT return is correct. QuickBooks calculates the amount based on gross sales (inclusive). However, Box 6 is labeled as the Net value of Sales that is without the tax. I’m also adding an article that provides a breakdown on how QBO computes the FRS: UK Flat Rate Scheme: How does it work?
Additionally, this guide covers all the details about the VAT Flat Rate Scheme and how to manage two rates: HMRC.
Please don't hesitate to let me know if there's anything you need, I'm always up to talk about QuickBooks. Thanks for reaching out to the Community and have a good one.