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Frontier LLMs fail tax calculations; experts advise deterministic engines

By PulseAugur Editorial · [1 sources] ·

A new benchmark, TaxCalcBench, reveals that even frontier Large Language Models struggle with tax calculations, with the best performer, Gemini 2.5 Pro, only getting 32% of tax returns correct. The study suggests that LLMs should not be the final authority on financial decisions like taxes, discounts, or pricing due to their probabilistic nature and inconsistent outputs. Instead, the recommended approach is a division of labor where LLMs translate natural language rules into formal specifications, which are then executed by deterministic engines for accuracy and auditability. AI

IMPACT Highlights the limitations of current LLMs for critical financial decisions, suggesting a hybrid approach for improved accuracy and auditability.

RANK_REASON The cluster discusses a new benchmark evaluating LLM performance on a specific task, which falls under research. [lever_c_demoted from research: ic=1 ai=1.0]

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Frontier LLMs fail tax calculations; experts advise deterministic engines

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The cluster discusses a new benchmark evaluating LLM performance on a specific task, which falls under research. [lever_c_demoted from research: ic=1 ai=1.0]
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COVERAGE [1]

  1. dev.to — LLM tag TIER_1 English(EN) · Webmaster Ramos ·

    Frontier LLMs Get 2 of 3 Tax Returns Wrong - Stop Letting Them Decide

    <p>Everyone is wiring LLMs into checkout flows right now. I want to make the unpopular case that for the decisions which actually move money - tax, discounts, eligibility, pricing - the model should never have the final say. Not because the models are bad, but because I have the …

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