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Qotien IFI Calculator — French Wealth Tax (Impôt sur la Fortune Immobilière) Simulator
x402
Qotien IFI Calculator — French Wealth Tax (Impôt sur la Fortune Immobilière) Simulator is a paid API for AI agents from app.qotien.fr, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).
Computes the French IFI (Impôt sur la Fortune Immobilière) wealth tax due given a household's taxable real estate assets, deductible debts, and optionally household income for the art. 979 cap calculation.
Price / call$0.25
Success—
StatusUnknown
How this service works
Simulateur IFI, PER, IR et retraite (32 régimes). Logiciel CGP : bilan patrimonial, déclaration 2042, LMNP. Chiffres sourcés Légifrance et BOFiP. 14 jours d'essai.
Output
A JSON object with ok=true on success, containing a result object with the IFI amount in EUR, a human-readable label, a confidence level (typically 'fiable' for fiscal computations), the legal sources used (e.g. CGI art. 964, art. 977, art. 979), the fiscal vintage (barème year), and an optional capping warning. Returns ok=false with an error field on failure.
Example use cases
First-time IFI threshold check
“I think I might be subject to IFI this year — my real estate assets total about €1,450,000 gross, I have no deductible debts, and I don't need the income cap. Can you calculate whether I owe anything and how much?”
Wealth tax with mortgage debt and income cap
“Can you simulate the IFI for my client who has €3,200,000 in taxable real estate, €600,000 in deductible bank loans, annual household income of €250,000, and existing taxes (IR + social levies) of €70,000? I need the result after plafonnement art. 979.”
High-value portfolio IFI with art. 974 debt cap
“My client's real estate patrimony is €6,000,000 and they have €2,500,000 in deductible debts — please compute their IFI, making sure the art. 974 debt limitation above 5M€ is applied. No income capping needed for now.”
Technical details
Endpoint
POSThttps://app.qotien.fr/api/fiscal/v1/calc/ifiWhen to prefer
Choose this endpoint when you need a legally-sourced, CGI-compliant French IFI calculation for a household or client, especially when you need debt deduction (art. 974) and/or the art. 979 income-cap (plafonnement) applied. Prefer it over generic tax calculators because it cites Légifrance/BOFiP sources, handles the 1.3M€ threshold and progressive bracket logic, and returns a confidence indicator. Not suitable for non-French tax systems or for simulating IR/PER (use sibling endpoints for those).
Side effects
- Missing required field patrimoine_immobilier_taxable → validation error
- Negative values for patrimony or debts → schema minimum violation
- revenu_foyer absent but autres_impots_annuels provided → plafonnement ignored/warning
- Patrimony below 1.3M€ threshold → IFI = 0 returned (not an error)
- API payment not processed (x402) → 402 Payment Required before result delivered
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| dettes | number | Dettes déductibles rattachées à l'immobilier taxable (€). La limitation art. 974 s'applique au-delà de 5 M€ de patrimoine. |
| revenu_foyer | number | Revenus du foyer de l'année (€). Fourni → déclenche le plafonnement art. 979. Absent → IFI rendu avant plafonnement. |
| autres_impots_annuels | number | IR + prélèvements sociaux + CEHR déjà dus au titre de l'année (€), pour le calcul du plafonnement art. 979. Ignoré si revenu_foyer absent. |
| patrimoine_immobilier_taxable | number | Valeur du patrimoine immobilier taxable BRUT (avant dettes) entrant dans l'assiette IFI (€) — résidence principale après abattement 30 %, biens locatifs, SCPI part immobilière, etc. |
Output
Schema · Response
{
"type": "json",
"schema": {
"type": "object",
"required": [
"ok",
"domaine",
"capability",
"result",
"confiance",
"sources",
"millesime_fiscal"
],
"properties": {
"ok": {
"type": "boolean",
"description": "true = succès ; false = erreur (champ \"error\" présent à la place de result)."
},
"result": {
"type": "object",
"properties": {
"unit": {
"type": "string",
"description": "Unité de value (EUR, PERCENT, RATE…)."
},
"label": {
"type": "string",
"description": "Libellé lisible du résultat."
},
"value": {
"type": "number",
"description": "Valeur principale (quand le résultat est scalaire)."
},
"confiance": {
"enum": [
"fiable",
"estime",
"partiel",
"non_calculable",
"sourcee",
"variable"
],
"type": "string",
"description": "Confiance propre au résultat retraite (prime sur la confiance de capacité)."
}
},
"description": "Résultat. Contient typiquement { value:number, unit:string, label:string } ; les outils retraite ajoutent confiance, fourchette, et le détail par régime."
},
"domaine": {
"enum": [
"fiscal",
"retraite",
"referentiel",
"qotien"
],
"type": "string",
"description": "Domaine de la capacité."
},
"sources": {
"type": "array",
"items": {
"type": "string"
},
"description": "Sources primaires/légales du calcul."
},
"confiance": {
"enum": [
"fiable",
"estime",
"partiel",
"non_calculable",
"sourcee",
"variable"
],
"type": "string",
"description": "Niveau de confiance de CE résultat (fiscal = fiable ; retraite = variable)."
},
"capability": {
"type": "string",
"description": "Nom de la capacité appelée."
},
"referentiel": {
"type": "string",
"description": "Version du référentiel sourcé utilisé."
},
"annee_revenus": {
"type": "number",
"description": "Année des revenus concernés."
},
"avertissement": {
"type": "string",
"description": "Avertissement d'usage (résultat brut, pas un conseil personnalisé)."
},
"millesime_fiscal": {
"type": "string",
"description": "Millésime fiscal (année des barèmes appliqués)."
}
}
},
"example": {
"ok": true,
"result": {
"unit": "EUR",
"label": "Impôt sur la fortune immobilière (IFI)",
"value": 0
},
"domaine": "fiscal",
"sources": [
"CGI art. 964 (seuil 1,3 M€)",
"CGI art. 977 (barème + décote)",
"CGI art. 974 (limitation des dettes)",
"CGI art. 979 (plafonnement 75 %)"
],
"confiance": "fiable",
"capability": "ifi",
"referentiel": "references_officielles.json v0.8.6",
"annee_revenus": 2025,
"millesime_fiscal": "2026"
}
}Tags
x402
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