Bro, practically speaking, you pay 17% General Sales Tax on your electricity bill, which is a federal government tax, payable to FBR, but you can get that federal government tax adjusted against the provincial government tax payable to SRB.
I have been doing it since ages, then why is the vice versa treatment not allowed (Advance tax on registration / annual token payment made to provincial government adjusted against federal government tax payable), which, in fact, is fully adjustable under section 234B of the Income tax ordinance, 2001?