Tax deduction exclusion: Special Economic Zone developers barred from section 80 IAB benefits for developments commencing on or after April 2017. The Bill inserts a proviso in sub section (1) of section 80 IAB excluding an assessee who is a developer where the development of a Special Economic Zone begins on or after 1 April 2017 from the section's deduction; previously developers commencing development on or after 1 April 2005 were entitled to a 100% deduction of profits and gains from such business. The amendment takes effect from 1 April 2017 and applies to the assessment year 2017 2018 and thereafter.