Exact French tax & payroll calculations for AI agents: income tax (impôt sur le revenu: parts, quotient familial, décote, TMI), micro-entrepreneur URSSAF contributions (ACRE, versement libératoire) and gross-to-net salary with total employer cost. Deterministic, no LLM: matches all 7,095 values of the official DGFiP tax tables and URSSAF's official engine. Missing or unsupported inputs are answered for free with the questions to ask the user; you pay $0.005 in USDC via x402 only when the calculation succeeds. Free catalogue tool: list_france_calculators.
Scored across 4 tools
Each tool targets a clearly distinct domain: employee gross-to-net payroll, household income tax, and micro-entrepreneur URSSAF contributions, with list_france_calculators acting as an explicit router. The only mild adjacency is that gross-to-net mentions prélèvement à la source while income tax computes the actual IR, but the descriptions make the boundary explicit (withholding vs. annual household tax).
All names are snake_case and share a consistent france_ domain prefix, which makes the family easy to scan. The single deviation is list_france_calculators, which uses a verb prefix while the three calculators are noun-only, so it is not a strict verb_noun pattern throughout.
Four tools is a tight, well-scoped set for a niche calculator server, and each calculator plus the discovery tool earns its place. It sits at the thin end of the ideal range, with room expected to grow as more calculators are added.
The surface covers the three main French personal tax/payroll workflows and provides a free discovery tool with schemas and examples, so agents are not left guessing. Gaps remain around credits/reductions, non-resident and overseas cases, and there is no tool that chains payroll output into the income-tax calculation, but these are documented refusals rather than dead ends.
French private-sector gross-to-net salary (salaire brut → net), mainland France, 2026 rules, CDI or CDD, full-time or part-time (temps partiel): employee contributions, net pay, net taxable pay, optional tax withholding (prélèvement à la source), RGDU reduction, employer cost. For a CDD: end-of-contract bonus (prime de précarité), paid-leave indemnity, CPF-CDD, monthly average and contract total. Use when a user asks for the net salary from a gross salary in France (CDI or CDD, full-time or part-time), the total cost of an employee for the employer, the end-of-contract bonus of a fixed-term contract, or the amount of employer and employee social contributions. Deterministic code, no LLM: uses URSSAF's official payroll engine (modele-social). Official 2026 rates re-applied by hand in tests, official RGDU formula and example, and 30 cases checked on the official URSSAF salary simulator (15 full-time CDI, 15 CDD and part-time). Not supported (refused for free with HTTP 422): temporary agency work (intérim), CDD à objet défini, fixed-term contracts ended early, overtime, incomplete months, fixed-days (forfait jours), apprentices and interns, company officers (SAS president), Alsace-Moselle, overseas departments, salaries below the minimum wage (SMIC, prorated for part-time), years other than those listed. Price: 0.005 USDC per successful call, paid with x402 over MCP. Missing or invalid fields are reported for free with the questions to ask the user; you never pay for an error. Returns JSON (also in structuredContent): calculateur, resultat, detail (step by step), hypotheses, bareme (version, effective date, sources), estimation_indicative, avertissement, lien_verification. Full output schema and a real example: list_france_calculators.
Inputs: annee (required), periode (required), effectif (required), salaire_brut (required), +15 more.
Computes French personal income tax (impôt sur le revenu, IR) for a tax household: number of tax shares (parts, quotient familial), gross tax on the official DGFiP progressive scale, family-quotient cap, décote, net tax payable, average rate and marginal rate (TMI). Income years 2024, 2025. Input: household net taxable income, or declared salaries (the 10% deduction is applied). Use when a user asks how much French income tax a household pays, its marginal tax bracket (TMI), its number of tax shares, or the effect of marriage or children on the tax. Deterministic code, no LLM, exact decimal arithmetic. Matches all 7,095 values of the official DGFiP tax tables (brochure pratique 2025 and 2026) to the euro, and 15 cases checked on the official impots.gouv.fr simulator. Not supported (refused for free with HTTP 422): non-residents, overseas departments, alternating-custody children, extra half-shares (disability, veterans, box L), exceptional income taxed with the quotient system, tax credits and reductions, incomes above the high-income contribution thresholds (CEHR/CDHR). Price: 0.005 USDC per successful call, paid with x402 over MCP. Missing or invalid fields are reported for free with the questions to ask the user; you never pay for an error. Returns JSON (also in structuredContent): calculateur, resultat, detail (step by step), hypotheses, bareme (version, effective date, sources), estimation_indicative, avertissement, lien_verification. Full output schema and a real example: list_france_calculators.
Inputs: annee_revenus (required), cas_particuliers (required), enfants_a_charge (required), situation_familiale (required), +5 more.
Computes what a French micro-entrepreneur (auto-entrepreneur, micro-entreprise) pays to URSSAF for a month, quarter or year: social contributions (with or without ACRE), vocational training contribution (CFP), chamber tax (taxe pour frais de chambre), optional flat-rate income tax (versement libératoire), total to pay and net income. Years 2025, 2026, all six activity categories (sales, commercial or craft services, liberal professions SSI or CIPAV). Use when a user asks how much URSSAF contributions an auto-entrepreneur owes on a given turnover, what the ACRE reduction changes, or how much remains as net income. Deterministic code, no LLM, exact decimal arithmetic. Cross-checked on 2,000 cases against URSSAF's official engine (modele-social) and on 15 cases from the official URSSAF simulator. Not supported (refused for free with HTTP 422): mixed activities, furnished rentals and holiday lets, overseas departments, Alsace-Moselle craftspeople, periods straddling the end of ACRE, ACRE in 2025, minimum-contribution option, exit from the micro regime. CFE, VAT and business expenses are not included. Price: 0.005 USDC per successful call, paid with x402 over MCP. Missing or invalid fields are reported for free with the questions to ask the user; you never pay for an error. Returns JSON (also in structuredContent): calculateur, resultat, detail (step by step), hypotheses, bareme (version, effective date, sources), estimation_indicative, avertissement, lien_verification. Full output schema and a real example: list_france_calculators.
Inputs: acre (required), annee (required), periode (required), activite (required), +7 more.
Free. Lists every available French tax and payroll calculator with its MCP tool name, price, input schema, example input, real example output and unsupported cases. Call it first if you are unsure which tool fits the user’s question.
Inputs: no named parameters.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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France 2026: full income tax return, net salary, gross for net, employer cost, vs the Netherlands
Calcul fiscal et retraite français, déterministe et sourcé. Aucun conseil.
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