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Qotien Flat Tax vs Barème Calculator
x402
Qotien Flat Tax vs Barème Calculator 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).
Compares French flat tax (PFU/30%) against progressive income tax (barème) for a given capital income to determine the optimal taxation option for a French household.
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
Returns a JSON object with: a boolean success flag, the comparison result (value in EUR showing the difference or optimal choice, with label and unit), confidence level (fiable/estime/partiel/variable), legal sources from CGI/BOFiP, the fiscal year applied, and a disclaimer that the result is not personalized financial advice.
Example use cases
Dividend tax optimization for investor
“I earned €20,000 in dividends this year. My household net taxable income excluding this is €60,000 and I'm single. Should I go with the 30% flat tax or opt for the progressive barème on my tax return?”
Life insurance taxation decision
“I have a life insurance contract with €150,000 in premiums outstanding and made a €8,000 gain. My taxable income is €35,000 and I'm married filing jointly with 2 parts. Which tax option — PFU or barème — gives me the lower tax bill?”
Crypto gains tax comparison for PACS couple
“My partner and I are PACSed with 2 family quotient parts. We made €5,000 in crypto gains this year and our other net taxable income is €42,000. Tell me whether the flat tax or the barème is better for our crypto gains.”
Technical details
Endpoint
POSThttps://app.qotien.fr/api/fiscal/v1/calc/flat_tax_vs_baremeWhen to prefer
Choose this endpoint when you need to compute the French flat tax (PFU 30%) vs progressive income tax (barème) comparison for capital income types including dividends, interest, capital gains, crypto, PEA, real estate, or life insurance (over or under 8 years). It sources data directly from Légifrance and BOFiP, making it suitable for compliance-adjacent financial advisory tools, CGP (wealth management) software, and French tax optimization workflows. Prefer this over generic tax calculators when dealing specifically with French fiscal law and capital income taxation.
Side effects
- Missing required fields (type_revenu or montant not provided) — returns ok:false with error message
- Invalid enum value for situation or type_revenu — returns validation error
- montant below minimum (negative value) — schema validation failure
- Network timeout or service unavailability — HTTP 5xx error
- Payment not provided or insufficient — HTTP 402 response requiring x402 payment of $0.25 USDC
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| parts | number | Parts de quotient familial. |
| montant | number | Montant du revenu / gain (€). |
| situation | string | Situation familiale. |
| av_encours | number | Pour av_plus8ans : encours total des primes (détermine le taux réduit 7,5 % vs 12,8 %) (€). |
| type_revenu | string | Nature du revenu du capital. |
| revenu_net_imposable | number | Revenu net imposable du foyer HORS ce revenu (€) — détermine la TMI pour l'option barème. |
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": "PFU (flat tax) vs barème progressif",
"value": 0
},
"domaine": "fiscal",
"sources": [
"CGI art. 200 A (PFU + option 2OP)",
"CGI art. 158-3-2° (abattement 40 %)",
"CGI art. 154 quinquies (CSG déductible)",
"LFSS 2026 art. 12 (PS par nature)"
],
"confiance": "fiable",
"capability": "flat_tax_vs_bareme",
"referentiel": "references_officielles.json v0.8.6",
"annee_revenus": 2025,
"millesime_fiscal": "2026"
}
}Tags
x402
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