<ul><li><a href=https://taxnet.nadra.gov.pk/itax/howsystemworks target=_blank>Federal Board of Revenue of Pakistan(website of Federal Board of Revenue of Pakistan)</a></li><li><a href=https://download1.fbr.gov.pk/Docs/20211191412128257e-PaymentIncomeTax,SalesTax&FED.pdf target=_blank>Federal Board of Revenue of Pakistan(Guide on online payment of taxes)</a></li><li><a href=https://e.srb.gos.pk/ target=_blank>Sindh Revenue Board(website of Sindh (provincial) Revenue Board's taxpayer facilitation portal)</a></li></ul>