Open the list of FBR field offices made available to you on FBR's website, now click on the office you are going to apply for; say you live in Karachi and you are going for Regional Tax Office, Karachi--click on it, on top of the page will be the name of the appointing authority, as in "Office of the Chief Commissioner, Regional Tax Office 1, Karachi" and that is what you have to write after "To". Make sure you write the proper address like opp. Sindh Secretariat, on Shahrah-e-Kamal Ata Turk etc., if you are sending your application by mail.


In Roman Urdu:-

Meray azeez humwatanon (just kidding), bhaiyon aur behnon, aap log jis FBR ke daftar mei apply karna chahtey hain jaisay ke farz karein aap Model Customs Collectorate, Sargodha mei apply karna chahtey hain tu uspe click karein ooper hee apko yeh likha hua nazar ayega "OFFICE OF THE COLLECTOR, MODEL CUSTOMS COLLECTORATE, SIALKOT. Sambrial Dryport, Sialkot." isko dekhein aur ditto form pe "To" ke agay chaapdein, tension khatam.