What is the tolerance threshold under the EU-Switzerland?

The general tolerance is 10% of the ex-works value of the finished product.

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EU-Switzerland - HS 29

EU-Switzerland Free Trade Agreement

8 rulesTolerance: 10%1973

2901Acyclic hydrocarbons for use as power or heating fuels

Specific process(es). See Introductory Note 9.

OR - alternative rule

Operations of refining and / or one or more specific process(es). For the special conditions relating to "specific process(es)", see Introductory Notes 8.1 to 8.3.