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Stock-based compensation | 12 Months Ended
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Mar. 31, 2019
Stock-based compensation | 22. Stock-based compensation The stock-based compensation plans of the Bank are as follows. Employees Stock Option Scheme(ESOP): The shareholders of the Bank approved in January 2000 Plan “A”, in June 2003 Plan “B”, in June 2005 Plan “C”, in June 2007 Plan “D”, in June 2010 Plan “E”, in June 2013 Plan “F”, in July 2016 Plan “G” of the Employees’ Stock Option Scheme (the “Plan”). The Bank reserved 50.0 million equity shares, with an aggregate nominal value of Rs.100.0 million, for issuance under each Plan “A”, “B” and “C”. Under Plan “D” the Bank reserved 75.0 million equity shares with an aggregate nominal value of Rs.150.0 million. The Bank reserved 100.0 million equity shares with an aggregate nominal value of Rs. 200.0 million, for issuance under each Plan “E”, “F” and “G”. Under the terms of each of these Plans, the Bank may issue stock options to employees and whole time directors of the Bank, each of which is convertible into one equity share. Plan A provides for the issuance of options at the recommendation of the Nomination and Remuneration Committee of the Board (the “NRC”) at an average of the daily closing prices on the BSE Limited during the 60 days preceding the date of grant of options, which was the minimum prescribed option price under regulations then issued by the Securities and Exchange Board of India (“SEBI”). Presently, there are no stock options issued and outstanding under Plan A. Plan B, Plan C, Plan D, Plan E, Plan F and Plan G provide for the issuance of options at the recommendation of the NRC at the closing price on the working day immediately preceding the date when options are granted. For Plan B the price is that quoted on an Indian stock exchange with the highest trading volume during the preceding two weeks, while for Plan C, Plan D, Plan E, Plan F and Plan G, the price is that quoted on an Indian stock exchange with the highest trading volume as of the working day preceding the date of grant. Presently, there are no stock options issued and outstanding under Plan B. Such options vest at the discretion of the NRC. These options are exercisable for a period following vesting at the discretion of the NRC, subject to a maximum of five years, as set forth at the time of the grant. Modifications, if any, made to the terms and conditions of these Plans as approved by the NRC are disclosed separately. On April 4, 2017 and April 21, 2017, the NRC approved, under Plan F, the grant of 16,865,850 options (Scheme XXVII) and the grant of 16,200 options (Scheme XXVIII), respectively, to the employees of the Bank. On September 1, 2018, September 29, 2018 and February 2, 2019 the Nomination and Remuneration Committee of the Board approved, under Plan G, the grant of 19,119,000 options (Scheme XXIX), the grant of 440,000 options (Scheme XXX) and the grant of 336,000 options (Scheme XXXI), respectively, to the employees of the Bank. Modification of employee stock option schemes During the periods ended March 31, 2017, March 31, 2018 and March 31, 2019, there were no modifications to employee stock option schemes. Assumptions used The fair value of options has been estimated on the dates of each grant using a binomial option pricing model with the following assumptions:
|  | Years ended March 31,
|  | 2017 |  |  | 2018 |  | 2019
Dividend yield |  |  | 0.0 |  |  | 0.65%-0.66% |  | 0.62%-0.65%
Expected volatility |  |  | 0.0 |  |  | 19.94%-21.65% |  | 14.53%-18.68%
Risk-free interest rate |  |  | 0.0 |  |  | 6.73%-7.20% |  | 7.23%-8.31%
Expected term (in years) |  |  | 0.0 |  |  | 4.66-6.06 |  | 2.78-5.16
The Bank recognizes compensation expense related to stock and option awards over the requisite service period, generally based on the instruments’ grant-date fair value, reduced by expected forfeitures. Ultimately, the compensation cost for all awards that vest is recognized. Activity and other details Activity in the options available to be granted under the Employee Stock Option Scheme is as follows:
|  | Number of options available to be granted year ending March 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
Options available to be granted, beginning of period |  |  | 31,534,850 |  |  |  | 133,673,650 |  |  |  | 117,841,600 |
Equity shares allocated for grant under the plan |  |  | 100,000,000 |  |  |  | 0.0 |  |  |  | 0.0 |
Options granted |  |  | 0.0 |  |  |  | (16,882,050 | ) |  |  | (19,895,000 | )
Forfeited/lapsed |  |  | 2,138,800 |  |  |  | 1,050,000 |  |  |  | 3,260,085 |
Options available to be granted, end of period |  |  | 133,673,650 |  |  |  | 117,841,600 |  |  |  | 101,206,685 |
Activity in the options outstanding under the Employee Stock Option Scheme is as follows:
|  | Years ended March 31, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | Options |  |  | Weighted average exercise price |  |  | Options |  |  | Weighted average exercise price |  |  | Options |  |  | Weighted average exercise price |
Options outstanding, beginning of period |  |  | 128,654,300 |  |  | Rs. | 840.19 |  |  |  | 92,156,300 |  |  | Rs. | 904.97 |  |  |  | 75,443,800 |  |  | Rs. | 1,050.22 |
Granted |  |  | 0.0 |  |  |  | 0.0 |  |  |  | 16,882,050 |  |  |  | 1,433.23 |  |  |  | 19,895,000 |  |  |  | 2,060.47 |
Exercised |  |  | (34,359,200 | ) |  |  | 658.20 |  |  |  | (32,544,550 | ) |  |  | 837.59 |  |  |  | (23,772,304 | ) |  |  | 925.79 |
Forfeited |  |  | (1,992,500 | ) |  |  | 981.44 |  |  |  | (986,800 | ) |  |  | 1,055.59 |  |  |  | (3,205,385 | ) |  |  | 1,518.42 |
Lapsed |  |  | (146,300 | ) |  |  | 857.61 |  |  |  | (63,200 | ) |  |  | 963.45 |  |  |  | (54,700 | ) |  |  | 837.10 |
Options outstanding, end of period |  |  | 92,156,300 |  |  | Rs. | 904.97 |  |  |  | 75,443,800 |  |  | Rs. | 1,050.22 |  |  |  | 68,306,411 |  |  | Rs. | 1,365.97 |
Options exercisable, end of period |  |  | 56,314,000 |  |  | Rs. | 835.06 |  |  |  | 46,810,250 |  |  | Rs. | 901.44 |  |  |  | 40,304,861 |  |  | Rs. | 1,017.78 |
Weighted average fair value of options granted during the year |  |  |  |  |  | Rs. | 0.0 |  |  |  |  |  |  | Rs. | 464.17 |  |  |  |  |  |  | Rs. | 525.57 |
The following summarizes information about stock options outstanding as of March 31, 2019:
|  |  |  | As of March 31, 2019 |
Plan |  | Range of exercise price |  | Number of shares arising out of options |  |  | Weighted average remaining life (years) |  |  | Weighted average exercise price |
Plan C |  | Rs.680.00 to Rs.835.50 (or US$ 9.83 to US$ 12.08) |  |  | 1,537,400 |  |  |  | 0.87 |  |  |  | 685.70 |
Plan D |  | Rs.680.00 (or US$ 9.83) |  |  | 659,900 |  |  |  | 0.97 |  |  |  | 680.00 |
Plan E |  | Rs.680.00 (or US$ 9.83) |  |  | 2,498,700 |  |  |  | 0.96 |  |  |  | 680.00 |
Plan F |  | Rs.835.50 to Rs. 1,462.15 (or US$ 12.08 to US$ 21.14) |  |  | 44,238,411 |  |  |  | 2.71 |  |  |  | 1,134.48 |
Plan G |  | Rs.2,006.05 to Rs. 2,090.45 (or US$ 29.01 to US$ 30.23) |  |  | 19,372,000 |  |  |  | 3.57 |  |  |  | 2,060.45 |
The intrinsic value, of options exercised during the years ended March 31, 2017, March 31, 2018 and March 31, 2019 at grant date was Rs. 140.7 million, Rs. 28.8 million and nil, respectively, and at exercise date was Rs. 26,951.4 million, Rs. 34,123.2 million and Rs. 33,117.4 million, respectively. The aggregate intrinsic value as of grant date and as at March 31, 2019 attributable to options which are outstanding as on March 31, 2019 was Rs. 0.6 million (previous year Rs. 0.6 million) and Rs. 65,091.1 million (previous year Rs. 63,062.0 million), respectively. The aggregate intrinsic value as at grant date and as at March 31, 2019 attributable to options exercisable as on March 31, 2019 was Rs. 0.2 million (previous year nil) and was Rs. 52,441.6 million (previous year Rs. 46,092.3 million), respectively. Total stock compensation cost (including on modification) recognized under these plans was Rs. 8,203.2 million, Rs. 6,594.6 million and Rs. 5,343.3 million during the years ended March 31, 2017, March 31, 2018 and March 31, 2019, respectively. There is no income tax benefit recognized associated with share-based compensation expense. As of March 31, 2019, there were 28,001,550 (previous year 28,633,550) unvested options with weighted average exercise price of Rs. 1,867.2 (previous year Rs. 1,293.5) and aggregate intrinsic value at grant date and as at March 31, 2019 was Rs. 0.3 million (previous year Rs. 0.6 million) and Rs.12,649.5 million (previous year Rs. 16,969.6 million), respectively. As at March 31, 2019, the total estimated compensation cost to be recognized in future periods was Rs.7,065.9 million (previous year Rs. 4,168.8 million). This is expected to be recognized over a weighted average period of 0.92 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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