# Qotien Jeanbrun Tax Deduction Simulator

> 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.

## Facts

- Endpoint: POST https://app.qotien.fr/api/fiscal/v1/calc/jeanbrun
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/qotien-jeanbrun-tax-deduction-simulator-245bf00b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LDYWX1Edlt0hTTzKklY1D

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability qotien-jeanbrun-tax-deduction-simulator-245bf00b -d '<json body>'
```

Example prompt: Using the Jeanbrun amortization device (LF 2026), calculate how much annual tax I'd save on a new apartment costing €350,000 that I plan to rent at the intermediate rate — I'm married with 2 parts and my taxable income is €85,000.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "parts": {
   "type": "number",
   "default": 1,
   "minimum": 1,
   "description": "Parts de quotient familial (pour la TMI dérivée)."
  },
  "situation": {
   "enum": [
    "Célibataire",
    "Marié(e)",
    "Pacsé(e)",
    "Divorcé(e)",
    "Veuf(ve)"
   ],
   "type": "string",
   "default": "Célibataire",
   "description": "Situation familiale (pour la TMI dérivée)."
  },
  "prix_logement": {
   "type": "number",
   "minimum": 0,
   "description": "Prix du logement (€). L'assiette amortissable = 80 % (terrain forfait 20 %)."
  },
  "type_location": {
   "enum": [
    "Intermédiaire",
    "Social",
    "Très social"
   ],
   "type": "string",
   "default": "Intermédiaire",
   "description": "Catégorie de location (taux et plafond annuel croissants)."
  },
  "type_logement": {
   "enum": [
    "Neuf",
    "Ancien rénové"
   ],
   "type": "string",
   "default": "Neuf",
   "description": "Neuf ou ancien rénové (taux d'amortissement différents)."
  },
  "tmi_pourcentage": {
   "type": "number",
   "maximum": 45,
   "minimum": 0,
   "description": "TMI en points de % (ex. 30) si connue — court-circuite la dérivation depuis le revenu."
  },
  "revenu_net_imposable": {
   "type": "number",
   "minimum": 0,
   "description": "Revenu net imposable du foyer (€) — sert à dériver la TMI pour l'économie d'impôt. Ignoré si tmi_pourcentage fourni."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/qotien-jeanbrun-tax-deduction-simulator-245bf00b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from app.qotien.fr](https://www.zero.xyz/host/app.qotien.fr/llms.txt)