 Therefore, Karachi collects a significant 53.38% of the total collections of the Federal Board of Revenue, out of which 53.33% are customs duty and sales tax on imports.Revenue collected from Karachi includes revenue from some other areas since the Large Tax Unit (LTU) Karachi and Regional Tax Offices (RTOs) Karachi, Hyderabad, Sukkur and Quetta cover the entire province of Sindh and Baluchistan.Karachi's contribution to national revenue is around 55%.