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Income tax expense (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Taxes [Abstract] |
Summary of Allocation of Income Tax Expense Between Current and Deferred Taxes | The table below shows the allocation of income tax expense between current and deferred taxes:
(€ million) | 2023 | 2022 |  | 2021 |
Current taxes | (2,560) |  | (2,774) |  |  | (1,908) |  |
Deferred taxes | 958 |  | 768 |  |  | 350 |  |
Total | (1,602) |  | (2,006) |  |  | (1,558) |  |
Income before tax and investments accounted for using the equity method | 7,153 |  | 10,422 |  |  | 7,798 |  |
Summary of Difference Between Effective Tax Rate and Standard Corporate Income Tax Rate | The difference between the effective tax rate and the standard corporate income tax rate applicable in France is explained as follows:
(%) | 2023 | 2022 | 2021
Standard tax rate applicable in France | 25.8 |  | 25.8 |  | 28.4 |
Difference between the standard French tax rate and the rates applicable to Sanofi(a) | (13.6) |  | (6.5) |  | (9.5) |
Revisions to tax exposures and settlements of tax disputes | 2.7 |  | (0.8) |  | 1.0 |
Probable reversal of temporary differences on investments in Consumer Healthcare subsidiaries(b) | 5.1 |  | — |  | — |
Fair value remeasurement of contingent consideration | 0.1 |  | (0.2) |  | — |
Other items(c) | 2.3 |  | 0.9 |  | 0.1 |
Effective tax rate | 22.4 |  | 19.2 |  | 20.0 |
(a) The difference between the French tax rate and tax rates applicable to foreign subsidiaries reflects the fact that Sanofi has operations in many countries, most of which have lower tax rates than France. (b) In accordance with IAS 12, a deferred tax liability was recognized in 2023 on the temporary differences arising on investments in subsidiaries which Sanofi expects will reverse in connection with the proposed separation of the Consumer Healthcare business, as announced in October 2023. (c) In determining the amount of the deferred tax liability for 2023, 2022 and 2021, Sanofi took into account changes in the ownership structure of certain subsidiaries.

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