Mandatory Invoice Details in France: B2C vs B2B (2026 Guide for Freelancers & SMEs)

Invoicing correctly is critical for freelancers and SMEs in France, whether you’re billing a private individual (B2C) or a business (B2B). Missing a mandatory detail can lead to fines, delayed payments, or issues during VAT audits. With VAT deadlines approaching and the 2026 Factur-X reform underway, understanding the differences between B2C and B2B invoicing—and staying compliant—has never been more important. This guide breaks down the essentials, including VAT deadlines, electronic invoicing, and how to streamline your process with the right tools.

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What Are the Mandatory Details for a French Invoice?

French law (Article 289 of the Code général des impôts) requires specific details on every invoice, regardless of whether you’re billing a private client or a business. These details ensure transparency, legal compliance, and smooth VAT reporting. Below is a breakdown of the core requirements, followed by the key differences between B2C and B2B invoicing.

Core Mandatory Details (B2C and B2B)

Every invoice you issue must include:

• Your business details: Full name (or company name), address, and SIREN number (or SIRET for secondary establishments).
• Client details: Full name and address. For B2B invoices, the client’s SIREN number is also required.
• Invoice number: A unique, sequential number (e.g., FACT-2026-001). Avoid gaps or duplicates, as this can trigger red flags during audits.
• Date of issue: The day the invoice is created.
• Date of supply: The date the goods or services were delivered (if different from the invoice date).
• Description of goods/services: Include the nature, quantity, unit price (excluding VAT), and total amount (HT).
• VAT details: The applicable VAT rate (e.g., 20%, 10%, 5.5%, or 0%) and the total VAT amount. If you’re exempt from VAT (e.g., under the franchise en base), include a mention like "TVA non applicable, art. 293 B du CGI."
• Total amount due: The sum of the HT amount and VAT (TTC).
• Payment terms: Due date, accepted payment methods, and any early payment discounts or late penalties.
• Delivery address: If different from the billing address.

B2B-Specific Requirements

When invoicing a business, you must also include:

• Client’s SIREN number: This is mandatory for all B2B transactions.
• Purchase order number: If the client provided one, include it to avoid disputes.
• Late payment penalties: Specify the rate (e.g., "Late payments are subject to a penalty of 1.5 times the legal interest rate").
• Electronic invoicing compliance: From September 1, 2026, all businesses must be able to receive electronic invoices in Factur-X format. While TPEs and SMEs have until September 1, 2027 to issue electronic invoices, preparing early is wise. Tools like Factur-X 2026 compliance ensure your invoices meet the latest standards without manual effort.

B2C-Specific Considerations

When billing a private individual, you can omit:

• The client’s SIREN number (not applicable).
• The purchase order number (rarely used in B2C).
• Electronic invoicing is optional for B2C clients, though you may still choose to send invoices electronically for convenience.

However, you must still include all other mandatory details, such as the VAT rate and payment terms. For example, if you’re a freelancer selling services to a private client, your invoice should clearly state whether VAT is included and how the client can pay (e.g., bank transfer, card payment). Offering card payment with QR code can speed up payments and improve cash flow.

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How to Handle VAT Deadlines in 2026

VAT deadlines vary depending on your business’s tax regime. Missing a deadline can result in penalties, so it’s crucial to stay organized. Here’s what you need to know for 2026:

Real Normal Regime (Monthly or Quarterly)

• Monthly declarations: If you file VAT monthly, your declaration and payment are due between the 15th and 24th of the following month. For example, your July 2026 VAT is due between August 15 and 24, 2026.
• Quarterly declarations: If you file quarterly, your declaration and payment are due between the 15th and 24th of the month following the quarter. For example, your Q3 2026 VAT (July–September) is due between October 15 and 24, 2026.

Simplified Regime (Annual)

• Annual declaration (CA12): For businesses closing their fiscal year on December 31, 2025, the CA12 declaration is due by May 5, 2026. If your fiscal year ends on a different date, you have three months from the closing date to file.
• Advance payments: Under the simplified regime, you may need to make semiannual advance payments (July and December). These are calculated based on your previous year’s VAT liability.

Key Dates to Remember

Regime	Declaration Period	Deadline (2026)
Real Normal (Monthly)	July 2026	August 15–24, 2026
Real Normal (Quarterly)	Q3 2026 (Jul–Sep)	October 15–24, 2026
Simplified (Annual)	FY 2025	May 5, 2026 (for Dec 31 close)

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Factur-X 2026: What You Need to Know

The Factur-X reform is a major shift in French invoicing, designed to modernize and digitize B2B transactions. Here’s how it affects you:

What Is Factur-X?

Factur-X is a hybrid electronic invoice format that combines:

• A human-readable PDF/A-3b (for clients to view and print).
• A machine-readable XML file (for automated processing and compliance).

This format ensures compatibility with the Public Invoicing Portal (PPF) and meets EU standards for electronic invoicing.

Key Deadlines

• September 1, 2026: All VAT-registered businesses must be able to receive Factur-X invoices. This applies to all businesses, regardless of size.
• September 1, 2027: TPEs and SMEs must issue Factur-X invoices for B2B transactions.

How to Prepare

1. Check your invoicing software: Ensure it supports Factur-X. If not, consider switching to a solution like Factur-X 2026 compliance, which automates the process.
2. Update your processes: Train your team on the new format and ensure your clients are aware of the changes.
3. Test early: If you’re a TPE or SME, start testing Factur-X invoices before the 2027 deadline to avoid last-minute issues.

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Common Mistakes to Avoid

Even small errors can lead to compliance issues or delayed payments. Here are the most common pitfalls and how to avoid them:

1. Missing or Incorrect SIREN Number

• Problem: Forgetting to include the client’s SIREN number on a B2B invoice is a frequent mistake. This can cause issues during VAT audits or delay payments.
• Solution: Double-check the SIREN number before sending the invoice. If you’re unsure, ask the client to confirm it.

2. Inconsistent Invoice Numbering

• Problem: Using non-sequential or duplicate invoice numbers (e.g., FACT-001, FACT-003, skipping FACT-002) can trigger audits.
• Solution: Use a strictly sequential numbering system. Tools like recurring invoices can automate this for subscriptions or retainers.

3. Incorrect VAT Treatment

• Problem: Applying the wrong VAT rate (e.g., 20% instead of 5.5%) or forgetting to mention an exemption (e.g., franchise en base) can lead to fines.
• Solution: Verify the VAT rate for each product or service. If you’re exempt, include the correct legal mention (e.g., "TVA non applicable, art. 293 B du CGI").

4. Late or Missing VAT Declarations

• Problem: Missing a VAT deadline can result in penalties (e.g., 10% of the VAT due for late declarations).
• Solution: Set reminders for key dates. If you’re on the real normal regime, consider automating your VAT reporting with accounting software.

5. Ignoring Factur-X Requirements

• Problem: Assuming Factur-X doesn’t apply to you until 2027 could leave you unprepared. From September 2026, you must be able to receive Factur-X invoices.
• Solution: Start preparing now. Use a compliant invoicing tool to avoid last-minute stress.

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How to Streamline Your Invoicing Process

Managing invoices manually is time-consuming and error-prone. Here’s how to automate and simplify the process:

1. Use Electronic Invoicing Tools

Tools like Factur-X 2026 compliance ensure your invoices meet the latest standards without manual effort. They also integrate with the Public Invoicing Portal (PPF), saving you time and reducing errors.

2. Automate Payment Reminders

Late payments are a common headache for freelancers and SMEs. Automating reminders can improve cash flow without awkward conversations. For example, automatic payment reminders send personalized emails before and after the due date, reducing the need for manual follow-ups.

3. Offer Multiple Payment Options

The easier you make it for clients to pay, the faster you’ll get paid. Including a QR code or payment link on your invoices allows clients to pay by card in seconds. This is especially useful for B2C clients, who may prefer digital payments over bank transfers. Learn more about card payment with QR code.

4. Centralize Your Invoicing

If you manage multiple entities, subcontractors, or subsidiaries, a multi-tenant invoicing system can save time. Tools like multi-tenant management allow you to handle invoicing for all your entities from a single account, with data isolation for security.

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How jefacturebien.fr Can Help

Staying compliant with French invoicing rules—whether for B2C or B2B—doesn’t have to be complicated. jefacturebien.fr offers a suite of tools designed to simplify invoicing, automate compliance, and improve cash flow:

• Factur-X 2026 compliance: Automatically generate invoices in the required format and submit them to the Public Invoicing Portal, ensuring you meet the September 2026 deadline.
• Automatic payment reminders: Reduce late payments with personalized email reminders sent before and after the due date.
• Card payments with QR code: Speed up payments by offering clients a secure, mobile-friendly payment option.

Explore all the features to streamline your invoicing process: jefacturebien.fr features.

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Conclusion

Invoicing correctly is non-negotiable for freelancers and SMEs in France. Whether you’re billing a private client or a business, ensuring your invoices include all mandatory details—and staying on top of VAT deadlines—is key to avoiding fines and maintaining smooth operations. With the Factur-X 2026 reform just around the corner, now is the time to prepare. By automating your invoicing process and using compliant tools, you can save time, reduce errors, and focus on growing your business. Start today by reviewing your current invoicing practices and exploring solutions like Factur-X 2026 compliance to future-proof your workflow.