French BNC filing guide: forms, boxes and common mistakes

Updated March 2026 - When a self-employed professional looks for a "BNC sheet", the question is usually very practical: which form should be filed, which boxes matter and when does the taxpayer move from the simplified logic to form 2035? The answer depends first on the applicable tax regime, not on the label used informally.

In everyday language, the expression often covers two very different situations:

• ▸you are under the micro-BNC regime and report your receipts through form 2042-C-PRO;
• ▸you are under the controlled declaration regime and need to file form 2035-SD with the related BNC package.

To place the issue in context, see also our guides on the special BNC regime, what a tax package is and the broader tax package guide.

If you fall under micro-BNC:

• ▸you do not file a 2035 return;
• ▸your professional receipts are generally reported through 2042-C-PRO;
• ▸the tax administration applies the standard 34% allowance.

That means the compliance burden is lighter, but only if the regime really matches your level of receipts and your economic reality. A simplified regime is useful only when it fits the business, not when it hides a poor tax choice.

If you are under the real BNC regime, the key reference becomes form 2035-SD.

This package is used to report:

• ▸professional receipts;
• ▸deductible expenses;
• ▸the taxable result;
• ▸and the annexes required for your specific situation.

Why form 2035 is more than just a form

The 2035 return is the tax translation of a proper BNC accounting framework. If the underlying bookkeeping is weak, the filing will usually be weak as well. The most common issues include:

• ▸missing receipts;
• ▸expenses that are not actually deductible;
• ▸incorrect allocations;
• ▸timing errors in attaching income or expenses.

Hayot Expertise insight: many mistakes come from confusing banking logic with tax logic. A sound BNC filing starts from clean accounting records, not from a raw bank export.

Ask yourself four questions first:

• ▸are you under micro-BNC or the controlled declaration regime?
• ▸are you operating as a micro-business or as a standard sole trader?
• ▸do your actual expenses make the micro regime less relevant?
• ▸does VAT already make the file more complex than it appears?

These questions matter because the wrong filing method rarely comes from a typo. It usually comes from choosing the wrong regime logic at the start.

A good review means checking the regime, confirming whether the 2035 package is required and making sure your bookkeeping, VAT treatment and income tax filing all tell the same story.

We can confirm the regime, prepare form 2035 if needed and check the consistency between your accounts, your VAT and your personal income tax filing.

Entrust your BNC file to Hayot Expertise

There is no single BNC filing sheet for everyone. Under micro-BNC, the key is usually 2042-C-PRO. Under the controlled regime, the reference becomes 2035-SD. The real priority is to match the filing to the correct tax framework.

Do you want to know whether you should remain under micro-BNC or move to form 2035? We can review your file and secure the appropriate filing logic. Book an appointment with an expert