Hi there, info1178.

Thank you for coming back here to the QuickBooks Community. I appreciate you for providing a screenshot about the issue so I can provide further details.

Since the TCS is manually entered in QuickBooks as a line item, this will not affect the total GST Calculations. This is because the TCS will post right away on what account you've selected when you record the Purchase bill.

While TCS is currently not supported with QuickBooks for the deduction, I suggest consulting an accountant. They can provide you other alternative ways on how to enter this TCS in the system. And, how to adjust this in QuickBooks once you get this amount claim while paying GST.

Please check this article to see different information about QuickBooks for GST and how this affects for QuickBooks users: How GST impacts QuickBooks users.

Please know that you're always welcome to post if you have any other concerns. Wishing you and your business continued success.