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Qotien Jeanbrun Tax Deduction Simulator
x402
Qotien Jeanbrun Tax Deduction 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).
Calculates the annual tax savings from the Jeanbrun rental amortization device (LF 2026) for a French property, based on housing price, rental category, and taxpayer marginal tax rate.
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 containing the primary computed tax saving value in EUR, the capability label ('Dispositif Jeanbrun'), the fiscal year (millésime fiscal), confidence level (fiable/estime/etc.), applicable legal sources (e.g. LF 2026 art. 47), and a non-advisory disclaimer. Includes unit, label, and value fields in the result object.
Example use cases
First-time landlord tax saving estimate
“I'm thinking of buying a new flat for €250,000 and renting it out at the intermediate social rate. I'm single with a net taxable income of €60,000. Can you use the Jeanbrun device to tell me how much income tax I'd save each year?”
High-income investor TMI optimization
“I already know my marginal tax rate is 41%. I want to know my annual tax saving under the Jeanbrun amortization scheme for an old renovated property I'm buying for €420,000 to rent in the 'Très social' category.”
Married couple rental investment comparison
“My wife and I file jointly with 3 family quotient parts and a household taxable income of €110,000. We're considering a new property at €300,000 to rent at the intermediate rate — what would the Jeanbrun device save us on our tax bill each year?”
Technical details
Endpoint
POSThttps://app.qotien.fr/api/fiscal/v1/calc/jeanbrunWhen to prefer
Use this endpoint when you need to compute the specific tax benefit from the French Jeanbrun landlord amortization device (Loi de Finances 2026, art. 47) for a given property. Prefer it over generic French tax calculators when the user is evaluating a buy-to-let investment under this specific device and needs a sourced, Légifrance/BOFiP-backed computation with confidence indicators. Not suitable for IFI, PER, or retirement simulations — those are separate sibling endpoints on the same platform.
Side effects
- Missing required prix_logement — returns ok:false with error message
- TMI value exceeds 45% maximum — validation error
- Invalid enum for type_location or type_logement — 400-level error
- Neither revenu_net_imposable nor tmi_pourcentage provided — unable to derive TMI, returns non_calculable confidence
- Fiscal referential not yet updated for current year — may return estime or partiel confidence
- Network/service unavailability — returns ok:false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| parts | number | Parts de quotient familial (pour la TMI dérivée). |
| situation | string | Situation familiale (pour la TMI dérivée). |
| prix_logement | number | Prix du logement (€). L'assiette amortissable = 80 % (terrain forfait 20 %). |
| type_location | string | Catégorie de location (taux et plafond annuel croissants). |
| type_logement | string | Neuf ou ancien rénové (taux d'amortissement différents). |
| tmi_pourcentage | number | TMI en points de % (ex. 30) si connue — court-circuite la dérivation depuis le revenu. |
| revenu_net_imposable | number | Revenu net imposable du foyer (€) — sert à dériver la TMI pour l'économie d'impôt. Ignoré si tmi_pourcentage fourni. |
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": "Dispositif Jeanbrun (amortissement bailleur, LF 2026)",
"value": 0
},
"domaine": "fiscal",
"sources": [
"LF 2026 art. 47 (loi n° 2026-103 du 19/02/2026)",
"CGI (amortissement bailleur — dispositif Jeanbrun)",
"BOFiP dédié attendu S2 2026"
],
"confiance": "fiable",
"capability": "jeanbrun",
"referentiel": "references_officielles.json v0.8.6",
"annee_revenus": 2025,
"millesime_fiscal": "2026"
}
}Tags
x402
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