Try this link: https://e.fbr.gov.pk/esbn/Service.aspx?PID=hlQmWNPq8p1dua2oTURqyg== select CNIC from Parameter Type list, then enter your NIC# in Registration No. box without dashes, and click on verify button. it will show a detail where you can find a Reference No. This Reference # is your TIN. I also googled and found this solution. You can verify yourself further.
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