Let's make sure you're able to enter the correct start period for your VAT setup, @meegank.
Usually, the information you set on the Start of the tax period field is based on when you want QuickBooks to begin tracking tax, or the start of your company's fiscal year.
However, we always would recommend reaching out to a tax advisor or the tax agency to help you put the correct month. This is to ensure your tax filing and amounts are accurately reported when filed.
Please see this article that talks about setting up VAT in QuickBooks Online for South Africa: Set up and use VAT in QuickBooks Online.
If you have additional questions or concerns about VAT setup or preferences, this thread is always available. You can also mention me on your posts for assistance. Have a wonderful day.