Special Economic Zone development deduction hinges on Developer status, timely filing, and market-value computation of eligible profits. Deduction is available to a Developer deriving profits from the business of developing a notified Special Economic Zone, subject to audit, timely return filing, and claim in the return. The deduction is computed under the former section 80-IAB framework, is available at 100% of eligible profits for 10 consecutive assessment years out of 15, and does not apply where development begins on or after 1 April 2017. Inter-unit transfers are to be valued at market value for computing eligible profits.