Yes! You can use AI to fill out Formulaire n° 1447-C-SD (Cerfa n° 14187*16) — Cotisation Foncière des Entreprises (CFE) 2026 — Déclaration initiale
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What this form asks for
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The AI checks your answers before you download
16 checks built for this form, so a wrong date or a missing answer is caught before anyone else sees it.
Validates that “Dénomination ou nom et prénom” is not empty and contains a plausible legal entity name or a person’s full name (not just initials or a single character). This is essential to identify the taxpayer and match the declaration to the correct entity in tax systems. If missing or clearly invalid, the submission should be rejected or routed to manual review because the declaration cannot be reliably attributed.
Checks that the SIRET is exactly 14 digits, contains only numeric characters, and passes the Luhn checksum (commonly used for SIREN/SIRET validation). This prevents mis-keyed establishment identifiers that would misroute the CFE record to the wrong establishment. If validation fails, the form should be blocked and the user prompted to correct the SIRET.
Ensures the NACE code is present and matches the expected structure (typically 4 digits + 1 letter, e.g., “6201Z”), with no spaces or invalid characters. This code drives classification and may affect exemptions and reporting. If the code is missing or malformed, the submission should be flagged for correction or manual verification.
Validates that the address in the commune includes minimum components (street number/name or lieu-dit, postal code, and commune) and is not identical to an empty placeholder. Correct address data is required to determine the commune of taxation and to link to property records. If incomplete, the system should request missing components or mark the record as incomplete for follow-up.
If a separate mailing address is entered, checks it contains required address elements and is not contradictory (e.g., missing postal code while commune is present). This is important to ensure the avis d’imposition reaches the taxpayer when paper issuance is used. If invalid, the system should either default to the commune address (if allowed) or require correction before acceptance.
When an accountant is listed, checks that name and address are present, phone number matches a valid French/international format, and email matches a standard email pattern. Accurate contact details are needed for clarifications and audits. If any provided contact field is malformed (especially phone/email), the submission should be flagged and the user asked to correct it.
And 10 more checks
- Validates declarant identity and contact details when declarant is external (A2)
- Ensures A3 origin of establishment has exactly one selection and triggers dependent requirements
- Requires former operator details (A4) when origin implies a predecessor
- Validates creation date fields (B1.1 or B1.8) and enforces correct date format and plausibility
- Validates employee counts are numeric, non-negative, and internally consistent (B1 and B2)
- Validates turnover and receipts fields are numeric and consistent with period selection (B1.6/13 and B1.7/14)
- Validates micro-entrepreneur status logic and entry date format (B2.5)
- Validates energy installation fields: eolienne checkbox requires raccordement date (B2.7–8)
- Validates hydraulic prorata format and range (B2.9)
- Validates property (Cadre C) surface totals and usage breakdown consistency for each declared ‘Bien’
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How to Fill Out 1447-C-SD (CFE 2026) Online for Free in 2026
What the AI walks you through.
- Renseigner l’identification de l’entreprise (A1) : dénomination, activités exercées, adresses (dans la commune et d’envoi), SIRET, code NACE, inscription RNE (métiers/artisanat) et coordonnées du comptable.
- Compléter la partie activité à domicile/chez le client (A2) : cocher si aucun autre local, indiquer la surface utilisée et, si applicable, les coordonnées du déclarant externe.
- Indiquer l’origine de l’établissement (A3) et, en cas de reprise/changement, identifier l’ancien exploitant (A4).
- Saisir les renseignements économiques et sociaux (B1 et B2) : dates de création, effectifs (salariés, apprentis, travailleurs handicapés, activité artisanale), chiffre d’affaires/recettes, caractère saisonnier, micro-entrepreneur, temps partiel, et informations spécifiques (éolienne/ouvrages hydrauliques si concerné).
- Déclarer les biens et locaux du nouvel établissement (Cadre C) : adresse/parcelle, situation, occupant précédent, date d’occupation, superficies détaillées par usage, statut d’occupation (propriétaire/locataire/sous-locataire/domiciliation) et joindre les pièces requises (bail, contrats, plan, etc.).
- Choisir et renseigner les exonérations éventuelles (Cadre D) : cocher l’option applicable, préciser les biens concernés et les pourcentages, et joindre les formulaires/annexes nécessaires (ex. 1465-SD, annexe 1447 E).
- Vérifier les informations, corriger les mentions erronées, signer et dater, puis transmettre un exemplaire au SIE compétent avant la date limite (avant le 1er janvier 2026).
Common Mistakes in Completing 1447-C-SD (CFE 2026)
The ones the AI is built to catch.
Confusing the establishment SIRET with the company SIREN (or leaving it blank)
Using an incorrect or missing NACE/APE activity code
Not selecting the correct 'Origine de l’établissement' (creation vs transfer vs acquisition)
Mismatch between establishment address (A1) and commune of taxation / mailing address
For home-based activity (A2), forgetting to tick the 'no other premises' box or omitting the surface in m²
Incorrect employee counts and categories (apprentices, disabled workers, artisan activity)
Entering turnover/receipts with VAT included or mixing 'CA' and 'recettes' fields
Not completing section C (taxable property details) or ignoring the 15€ per omission penalty warning
Surface breakdown errors (total m² not matching the sum of professional/industrial/commercial/habitation)
Selecting the wrong occupancy status (owner/tenant/sub-tenant/domiciliation) and missing required attachments
Requesting an exemption without completing the precise property identification and percentage allocation
Frequently Asked Questions About 1447-C-SD (CFE 2026)
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À quoi sert le formulaire n° 1447-C-SD (CFE 2026) ?
Qui doit remplir cette déclaration initiale ?
Quelle est la date limite d’envoi du formulaire pour la CFE 2026 ?
Où envoyer le formulaire et à qui puis-je poser des questions ?
Quelles informations d’identification de l’entreprise sont obligatoires (cadre A1) ?
Quelle adresse indiquer pour recevoir l’avis d’imposition papier (cadre A1, ligne 4) ?
Je travaille depuis mon domicile et je n’ai aucun autre local : que dois-je remplir (cadre A2) ?
Comment choisir l’origine de l’établissement (cadre A3) ?
Quand faut-il remplir l’identification de l’ancien exploitant (cadre A4) ?
Quelles périodes de référence utiliser pour les salariés et le chiffre d’affaires (cadre B1) ?
Je suis micro-entrepreneur : que dois-je indiquer dans le cadre B2 ?
Comment déclarer un établissement saisonnier (cadre B2) ?
Quels documents dois-je joindre pour les locaux (cadre C) ?
Que risque-t-on en cas d’oubli ou d’erreur dans le cadre C (biens passibles de taxe foncière) ?
Comment demander une exonération de CFE via ce formulaire (cadre D) ?
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