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Qotien — Surtaxe Plus-Value Immobilière
x402
Qotien — Surtaxe Plus-Value Immobilière is a paid API for AI agents from app.qotien.fr, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).
Calculates the French high-gain real estate capital gains surtax (surtaxe sur les plus-values immobilières) given a net taxable gain amount, sourced from CGI art. 1609 nonies G.
Price / call$0.05
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
Returns a JSON object with 'ok' status, the surtax amount in EUR with a human-readable label, the fiscal year (millésime_fiscal), a confidence level ('fiable' for this fiscal endpoint), the legal sources used (e.g. CGI art. 1609 nonies G), and an advisory disclaimer that the result is not personalised tax advice.
Example use cases
Pre-sale tax estimate for high-value property
“I'm planning to sell an apartment in Paris with an expected net taxable gain of €480,000 — what surtaxe sur les plus-values immobilières will I have to pay on top of the regular capital gains tax?”
CGP client advisory session
“My client is selling a rental property with a net plus-value of €250,000. Can you compute the surtaxe immobilière they'd face so I can include it in their bilan patrimonial?”
Zero-check for gain below threshold
“My net taxable real estate gain is only €45,000 — can you confirm whether any surtaxe sur les plus-values immobilières applies, or if it's zero?”
Technical details
Endpoint
POSThttps://app.qotien.fr/api/fiscal/v1/calc/surtaxe_pv_immobiliereWhen to prefer
Use this endpoint when you need a legally sourced, precise computation of the French high-gain real estate capital gains surtax (CGI art. 1609 nonies G) based on a single net taxable gain figure. Prefer it over generic tax calculators when accuracy traceable to Légifrance/BOFiP is required, or when building a broader CGP wealth advisory workflow that includes IFI, PER, or retirement simulations on the same platform.
Side effects
- Negative or missing plus_value value — API returns ok:false with error field
- plus_value below the statutory threshold — returns value:0 EUR (not an error, valid zero result)
- Malformed request body — HTTP 400 or ok:false
- Referential data out of date with latest Légifrance update — confiance may downgrade
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| plus_value | number | Plus-value nette imposable (€). |
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": "Surtaxe sur les plus-values immobilières",
"value": 0
},
"domaine": "fiscal",
"sources": [
"CGI art. 1609 nonies G"
],
"confiance": "fiable",
"capability": "surtaxe_pv_immobiliere",
"referentiel": "references_officielles.json v0.8.6",
"annee_revenus": 2025,
"millesime_fiscal": "2026"
}
}Tags
x402
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