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v3.26.1

Taxation - Valuation allowance (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Valuation allowance |  |  |
Balance at beginning of the year | ¥ 24,902,819 | ¥ 18,538,828 | ¥ 12,727,355
Additions | 4,481,920 | 6,363,991 | 5,811,473
Reduction due to expiration of tax attributes | (1,893,387) |  |
Balance at end of the year | ¥ 27,491,352 | ¥ 24,902,819 | ¥ 18,538,828

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of decrease in the valuation allowance for a specified deferred tax asset due to expiration of tax attributes. + References No definition available. + Details
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Namespace Prefix: | nio_
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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