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Income tax expenses (Details) ¥ in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 CNY (¥) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 CNY (¥) | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Composition of income tax expenses |  |  |  |  |  |
Current income tax expense | ¥ 9,010 |  | ¥ 10,437 |  |  |
Deferred taxation | 4,025 | $ 593 | (910) |  |  |
Income tax expenses | 13,035 | $ 1,920 | 9,527 |  |  |
Total tax adjustments | 6,085 |  | ¥ 4,144 |  |  |
Undistributed earnings intended to be invested indefinitely in the PRC | ¥ 131,700 |  |  |  |  |
KY |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Withholding tax to be imposed upon payments of dividends to shareholders (as a percent) | 0.00% | 0.00% |  |  |  |
HK |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Enterprise income tax rate (as a percent) | 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% |  |  |
Withholding income tax rate on dividends declared by PRC companies to their foreign investors (as a percent) | 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% |  |  |  |
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% |  |  |  |
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 |  |  |  |  |  |
Preferential tax rate (as a percent) |  |  |  | 15.00% | 15.00% |
Percentage of reduction in tax rate | 10.00% | 10.00% |  | 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% |
Preferential tax rate (as a percent) | 10.00% | 10.00% |  | 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% |
Percentage of reduction in tax rate | 10.00% | 10.00% | 10.00% |  |  |
Alibaba Beijing | PRC | Software Enterprise |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Preferential tax rate (as a percent) |  |  |  | 12.50% |  |
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
Alibaba Beijing | PRC | Key Software Enterprise |  |  |  |  |  |
Composition of income tax expenses |  |  |  |  |  |
Preferential tax rate (as a percent) |  |  |  | 12.50% |  |
Percentage of reduction in tax rate | 10.00% | 10.00% |  |  |  |

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