Income Tax Paripatra : http://nbr.gov.bd/taxtypes/income-tax/income-tax-paripatra/eng Challan Form: http://dae.portal.gov.bd/sites/default/files/files/dae.portal.gov.bd/forms/45ecc526_dffa_4ac0_beeb_e95ccd08a27e/Single%20Chalan%20form.pdf Editable Challan Form: https://fid.portal.gov.bd/sites/default/files/files/fid.portal.gov.bd/forms/fa1db13f_4601_470c_bd98_94edabd4edf4/Editable_Challan%20Form%20(Motijheel%20Office)_converted.pdf Online Challan Verification: http://103.48.16.132/echalan/ e-TIN registration: https://secure.incometax.gov.bd/TINHome Useful Link : https://home.kpmg/xx/en/home/insights/2017/03/bangladesh-income-tax.html Software : https://www.bdtax.com.bd/