Complete tutorial: setting up your professional space on impots.gouv.fr

When a company is registered in France, obtaining the SIREN number marks the official birth of the business. The fiscal relationship with the French tax authority — the Direction Générale des Finances Publiques (DGFiP) — begins at the same moment. The espace professionnel (the company's tax account on impots.gouv.fr) is the single access point for all tax declarations and payments: VAT (TVA), corporate income tax (IS — impôt sur les sociétés), the local business levy (CFE — cotisation foncière des entreprises), and the secure messaging channel with the SIE (Service des Impôts des Entreprises, the company's assigned corporate tax office). Without an active account, you cannot file, cannot pay, and cannot receive official correspondence through the secure channel.

The most common mistake in new company files is not technical — it is timing. Founders wait until the first tax deadline arrives, then discover the activation process takes several business days. The result: late filing, potential penalties, unnecessary stress. This tutorial gives you the exact procedure, the binding deadlines, and the recommended priority order for activating tax services. Start the process within 48 hours of receiving your SIREN.

The activation process runs in three phases, each with a strict time constraint.

Phase 1 — Online registration (10 to 15 minutes)

Go to impots.gouv.fr and click on "Votre espace professionnel" (Your professional space), then "Créer votre espace en ligne" (Create your space online). You will need:

• your SIREN number (9 digits), issued by INSEE after registration via the guichet unique (the unified business registration portal);
• a durable email address — one belonging to the legal representative or a dedicated company address, not a temporary or forwarding address;
• the legal representative's personal details (name, date of birth) as registered;
• the registered office address exactly as it appears in the business register.

Consistency is critical. Any mismatch can block automatic validation and require a manual intervention with the SIE. Before you start, cross-check your address against the Annuaire Entreprises directory, including any abbreviations used for the street type.

Phase 2 — Email link validation (deadline: 72 hours)

Immediately after submission, an email containing a validation link is sent to the address provided. This link expires after 72 hours. If you do not click it within that window, the request is cancelled and the process must be restarted from scratch. Check your spam folder if the email does not arrive within a few minutes.

Phase 3 — Postal code activation (deadline: 60 days)

Once the email link is validated, the tax authority sends a physical letter to the company's registered address. This letter contains a one-time activation code. You have 60 days to enter this code in your espace professionnel to complete the activation. Until this step is completed, the account remains pending and tax services cannot be accessed.

The full process — from online submission to a fully operational account — takes approximately 3 to 5 business days under normal conditions.

When creating the account, the platform asks you to choose between two modes.

Simplified mode (mode simplifié) is designed for a company managing its own tax obligations. It covers the needs of the vast majority of founders: SASU, SARL, SAS, SCI, liberal professions, and solo entrepreneurs. The interface is straightforward, and the legal representative or their accountant can navigate it without specific training. This is the right choice for a standard company creation in the large majority of cases.

Expert mode (mode expert) is built for tax representatives — accounting firms, holding companies, and groups that need to manage multiple SIREN numbers from a single account. EFI (échange de formulaires informatisé — online filing mode) for multiple entities is the typical use case. If you are only managing your own company, expert mode adds complexity without benefit.

The key practical point: switching from simplified to expert mode is possible at a later date. For a standard company creation, choose simplified mode. You can evolve the setup as your needs change.

The standard window is 3 to 5 business days. During peak periods — year-end, corporate tax campaign — postal delivery may add a few extra days. If your first VAT filing or first IS instalment falls within ten days of receiving your SIREN, start the creation on the same day. At Hayot Expertise, we recommend launching the account within 48 hours of receiving the SIREN — before the bank account is even opened. The registration takes 15 minutes; the delay risk it eliminates is significant.

Adhering to individual tax services is a separate step from creating the account. Once the account is active, you must manually enable each service relevant to your company's obligations.

TVA (VAT declarations CA3 or CA12 and online payment): activate this if your company is subject to VAT, which applies to most commercial entities. Filing frequency (monthly or quarterly) depends on your regime. If you operate under the VAT exemption threshold (franchise en base de TVA), activation is not immediately required, but enabling it in advance avoids a last-minute scramble if you exceed the threshold.

IS — corporate income tax (form 2065-SD and quarterly instalments): mandatory for any entity subject to corporate income tax (SASU, SARL, SAS by default). Instalments typically begin from the second financial year, but activate the service in advance so the first filing cycle does not catch you unprepared.

CFE/CVAE (local business levy — notice and online payment): due from all professionals exercising an independent business activity in France. Note that in the creation year, a specific initial return (form 1447-C — à vérifier) must be filed before 31 December of the year of creation. Failure to file this return on time is a recurring issue for companies that have not set up their account early enough.

Messagerie sécurisée (secure messaging): activate this as a first priority. This is the official communication channel with your SIE. The tax authority uses it for information requests, audit notifications, and certain formal notices. Failing to monitor this inbox is one of the most common operational gaps we see in new company files. An unanswered request from the SIE can escalate quickly.

Compte fiscal (tax account — payment and credit tracking): provides full history of payments, credits, and balances. Essential for verifying that payments have been correctly applied and for anticipating VAT credit refunds.

In multi-founder companies, who manages the tax account is rarely decided at incorporation. The result: nobody monitors the secure inbox, the postal code is set aside, the 60-day deadline passes, and the account expires.

The rule we apply: one legal representative creates the account, using their own email address and the registered office address for postal mail. If an external accountant needs filing access via EFI, that access is configured through the delegation settings — no shared credentials.

The resolution path for any blocking situation is the same: contact the SIE directly. Here are the most frequent scenarios.

• SIREN not recognised: data transmission between the guichet unique, INSEE, and the tax authority can take 48–72 hours. Wait before retrying — attempting creation too early is the most frequent cause of failed first attempts.
• Address mismatch: even a minor discrepancy — "Rue" vs "R." — causes failure. Cross-check via the Annuaire Entreprises before retrying.
• Expired email link: the 72-hour window is firm. Restart the creation process from impots.gouv.fr; the new request overwrites the previous one.
• Postal code not received, lost, or expired beyond 60 days: contact your assigned SIE by phone or via the impots.gouv.fr contact form to request a reissue or an alternative unblocking procedure. Tax obligations are not suspended while the account is inactive — act without delay.
• Account locked or forgotten password: use the online recovery function on impots.gouv.fr first. The SIE can lift a login lock after identity verification.

Your SIE's contact details are available in the services directory on impots.gouv.fr, searchable by registered address or postal code.

Once your espace professionnel is active and services are enabled, run a structured verification before your first filing deadline. The five minutes this takes can prevent a serious problem later.

The table below maps each check to the risk it prevents.

A practical calendar for a company created in mid-year — say, June — looks like this:

Updated 2026-05-26. This article is for information purposes only and does not replace personalised professional advice. For your specific situation, consult a registered expert-comptable.