S. 115BBE: Taxation of unexplained income – Amendment enhancing tax rate from 30% to 60% w.e.f. 01.04.2017 cannot be applied retrospectively to income of F.Y. 2016-17 – Law applicable on the first day of the assessment year governs assessment – Enhanced tax and consequential penalty provisions are prospective- Demonetisation- Cash deposited in Bank -Charge of tax- The enhanced rate of tax @60% came into force on 01.04.2017 and can apply only from that date, i.e. for financial year 2017-18 onwards. [S.4, 68, 69 to 69D, 271AAC, Taxation Laws (Second Amendment) Act, 2016, Art. 226)]