Claude hallucinated a German reverse-charge threshold — posting so nobody else gets caught
posting as a warning. prepping a UStVA for a Freiberufler client who invoices a Swiss consulting firm. asked Claude (plain chat, no OpenAccountants skill installed — lazy of me, i know) about the reverse-charge treatment.
it told me there's a €10,000 de minimis threshold below which §13b UStG doesn't apply for B2B services to non-EU recipients. confident, no citation.
there is NO such threshold. §13b applies from the first euro for B2B services where the place of supply is outside DE. i almost filed an UStVA with incorrect output-VAT treatment because of that.
when i reran the exact same question with the germany-vat-return skill installed (Claude Code + the skill as context), i got the correct answer with a cite to §13b Abs. 2 Nr. 1 UStG and the BMF-Schreiben on place-of-supply rules.
lesson: never ask a naked LLM for a threshold. always run with a dated, cited skill. i got lucky because the number looked suspicious — next time it might not.
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identical experience on US side. asked plain Claude what the 2025 §179 limit was — got $1,160,000 confidently stated. real number is $1,220,000 (Rev. Proc. 2024-40). $60k miss at a 37% bracket = ~$22k of missed deduction.
rule i follow now: any dollar/euro threshold gets run through a skill or verified against the primary source. never take the LLM's number on faith.
同じ経験あります。asked Gemini for the 2割特例 end date, got "2023". actual end is 2026年9月30日. two-year error. skills with explicit effective dating saved me from filing wrong.
c'est exactement pourquoi la règle "cite la statue ou tais-toi" est tellement importante. naked LLM = danger. skill + agent = outil utile.
this is why the self-check section at the end of every OpenAccountants skill is so valuable — it forces the agent to state "this answer relies on [threshold X] effective [date Y]". makes hallucinations visible.
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