FEC accounting file: what every company needs to know

Updated March 2026 - The FEC (Fichier des Écritures Comptables) becomes a concrete operational issue the moment a corporate tax audit opens. The question is not simply whether your accounting software can export a file with that name — it is whether the exported file is genuinely compliant with the article A47 A-1 format, internally coherent, consistent with the physical accounting journals, and reproducible across different export attempts.

See also anticipating a corporate tax audit, statutory accounts appendix thresholds and accounting process quality.

The FEC is the standardised digital file that French tax inspectors use to analyse computerised accounting during a tax audit (contrôle fiscal). It must contain all accounting entries from the audited period in a strictly prescribed format. The administration uses it to:

• ▸test the completeness of the accounting records — are all transactions present and none missing?
• ▸verify the internal consistency of entries — do totals balance, are journal codes used consistently, are dates within the correct fiscal year?
• ▸check for audit trail integrity — can the administration trace any entry back to its source document?
• ▸identify anomalies and patterns that may indicate errors, adjustments or irregularities in the accounting.

A deficient FEC is not just a technical problem — it is a signal to the tax administration. A file with format errors, missing fields, inconsistent journal entries or incoherent closing entries suggests an accounting process that lacks rigour. Specifically, common deficiencies reveal:

• ▸process gaps: entries that are recorded in ways that do not follow the normal accounting workflow, suggesting manual corrections or workarounds;
• ▸configuration anomalies: accounting software that is not configured to produce the correct FEC format, or that has been modified in ways that break the export logic;
• ▸audit trail breaks: entries that cannot be traced to a source document, or source document references that are inconsistent or incomplete;
• ▸closing incoherences: balances that do not carry forward correctly from one period to the next, or balance sheet accounts that do not reconcile between the FEC and the filed accounts.

Hayot Expertise advice: the right time to check a FEC is not the day the tax audit notification arrives. It is well before — as part of a routine accounting hygiene and compliance testing process. A FEC problem discovered during an audit is a problem that must be explained under pressure. The same problem discovered in advance can be corrected and documented before it ever reaches the inspector.

We recommend reviewing four dimensions to ensure FEC compliance:

1. ▸the format: does the exported file conform to the article A47 A-1 specifications — correct field names, correct delimiters, correct date formats, correct character encoding?
2. ▸field coherence: are all mandatory fields populated consistently — account numbers, journal codes, entry dates, descriptions and document references?
3. ▸journal concordance: do the totals in the FEC match the figures in the physical or digital accounting journals for the same period?
4. ▸export reproducibility: does re-exporting the file for the same period produce an identical result? Inconsistency between exports is a red flag that the administration will notice.

We can help you verify its conformity and identify the most sensitive anomalies before they are discovered under audit conditions.

👉 Discover our accounting and compliance support

In 2026, the FEC remains an excellent indicator of accounting process maturity. A clean file presupposes a clean process — one where entries are correctly structured, documented and consistent from the start. The companies best protected in a tax audit are those that treat FEC quality as a routine accounting standard, not an emergency to address when an audit opens.

Want to audit your FEC setup before it becomes a tax audit issue?
We can help you do it properly.

👉 Book an appointment with an expert