I checked my test file and can confirm that the Tax Collected at Source (TCS) is currently unavailable in QuickBooks Online. What you can do at the moment is consult with your accountant on how to record the TCS.
To check articles for taxes in QuickBooks Online, you can go to this link: Tax for QBO
Please let me know in your reply if you require additional information. I'll be right here to help. Take care!
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