GlossaryEN1 min readUpdated: Jun 18, 2026

tax res judicata

A tax assessment becomes res judicata once all statutory deadlines for objection and appeal have expired without a challenge being filed.

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Last updated: 18 June 2026Published: 27 January 2026

Source: https://de.wikipedia.org/wiki/Rechtskraft

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A tax assessment becomes res judicata once all statutory deadlines for objection and appeal have expired without a challenge being filed. At that point, the assessment is conclusively binding: the tax authority may proceed with enforcement, while the taxpayer loses the right to contest the underlying liability in court. In customs and international trade, this status is particularly relevant for import duty assessments that are no longer open to appeal. Tax res judicata should be distinguished from mere administrative finality, which may not preclude correction procedures under specific statutory provisions.

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tax res judicata

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