What is the French VAT return?

In practice, in France

Two regimes structure everything. Under the standard regime (réel normal), the return is the CA3 form, filed monthly — or quarterly when the VAT due stays low. Under the simplified regime (réel simplifié), the business pays instalments through the year and settles with an annual return, the CA12. Below the exemption thresholds (franchise en base), there is neither VAT on invoices nor a return to file.

The regime is not a scheduling detail — it changes cash flow. Under the simplified regime, instalments are based on the prior financial year, which shifts the payment effort away from current activity — bad news for a shrinking business, an advantage for a growing one.

In Odoo

Odoo produces the return from configured fiscal positions and tax rates, with the detail behind every box.

What distorts a return is almost never the calculation: it is an invoice entered without a fiscal position, a credit note wrongly matched, or an entry posted straight to a VAT account without a supporting document. Reconciling the VAT account against the return, every period, is the check that avoids painful corrections later.

Common mistakes

• Filing without having reconciled the VAT accounts to the general ledger.
• Forgetting that VAT on services is due on collection, not on invoicing, unless an option says otherwise.
• Letting a VAT credit sit unused instead of requesting a refund.