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Income tax expenses- General (Details) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2017 CNY (¥) | Mar. 31, 2016 CNY (¥) | Mar. 31, 2015 CNY (¥) | Mar. 31, 2014 | Mar. 31, 2012
Composition of income tax expenses |  |  |  |  |  |
Current income tax expense |  | ¥ 13,495 | ¥ 7,223 | ¥ 4,757 |  |
Deferred taxation | $ 41 | 281 | 1,226 | 1,659 |  |
Income tax expenses | $ 2,002 | ¥ 13,776 | ¥ 8,449 | ¥ 6,416 |  |
Enterprise income tax rate (as a percent) | 25.00% | 25.00% | 25.00% | 25.00% |  |
Undistributed earnings intended to be invested indefinitely in the PRC |  | ¥ 28,200 |  |  |  |
Adjustment |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Income tax expenses |  | ¥ 720 |  |  |  |
Cayman Islands |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Withholding tax to be imposed upon payments of dividends to shareholders (as a percent) | 0.00% | 0.00% |  |  |  |
Hong Kong |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Enterprise income tax rate (as a percent) | 16.50% | 16.50% | 16.50% | 16.50% |  |
PRC |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Enterprise income tax rate (as a percent) | 25.00% | 25.00% | 25.00% | 25.00% |  |
Withholding income tax rate on dividends declared by PRC companies to their foreign investors (as a percent) | 10.00% | 10.00% | 10.00% | 10.00% |  |
Lower withholding income tax rate on dividends declared by PRC companies to foreign investors with certain criteria met (as a percent) | 5.00% | 5.00% | 5.00% | 5.00% |  |
Minimum percentage of ownership interests held by investors in Hong Kong to qualify for lower withholding tax rate (as a percent) | 25.00% | 25.00% | 25.00% | 25.00% |  |
PRC | High and New Technology Enterprises |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Preferential tax rate (as a percent) | 15.00% | 15.00% |  |  |  |
PRC | Software Enterprise |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Period of full exemption from income tax | 2 years | 2 years |  |  |  |
Reduction in preferential tax rate during subsequent three years (as a percent) | 50.00% | 50.00% |  |  |  |
Period of 50% reduction to income tax rate | 3 years | 3 years |  |  |  |
PRC | Key Software Enterprise |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Preferential tax rate (as a percent) | 10.00% | 10.00% |  |  |  |
Alibaba China | PRC | High and New Technology Enterprises |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Enterprise income tax rate (as a percent) |  |  | 15.00% | 15.00% |  |
Alibaba China | PRC | Key Software Enterprise |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Preferential tax rate (as a percent) |  |  |  | 10.00% |  |
Taobao China | PRC | High and New Technology Enterprises |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Enterprise income tax rate (as a percent) |  |  | 15.00% | 15.00% |  |
Taobao China | PRC | Key Software Enterprise |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Preferential tax rate (as a percent) |  |  |  | 10.00% |  |
Tmall China | PRC | High and New Technology Enterprises |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Preferential tax rate (as a percent) | 15.00% | 15.00% | 12.50% | 12.50% | 12.50% |
Tmall China | PRC | Software Enterprise |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Period of full exemption from income tax |  |  |  |  |  | 2 years
Reduction in preferential tax rate during subsequent three years (as a percent) |  |  |  |  |  | 50.00%
Period of 50% reduction to income tax rate |  |  |  |  |  | 3 years

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