NF525 Fiscal Mode: every sale sealed, your attestation ready to hand over
If your business takes payments from individual customers in France, your software has to record every transaction in a way that is unalterable, secured, retained and archived. That is what French cash register regulation requires, and NF525 is its technical expression.
SimplyBook.me's NF525 Fiscal Mode is available. Once switched on, it signs and locks every invoice, every payment and every correction, and gives you the individual attestation of compliance to present during an inspection.
What is the NF525 standard?
NF525 is the standard certifying that software used to record payments meets the four requirements of the French tax authority:
unalterability of data
security of transactions
retention of data
archiving of fiscal information
These obligations exist to fight VAT fraud. They concern businesses that take payments from individual customers in France, and non-compliance carries a fine of €7,500 per piece of software, with 60 days to put things right.
What Fiscal Mode does for you
Once enabled in your custom features, Fiscal Mode works in the background. The way you take bookings and payments does not change.
Signing and chaining
Every invoice, payment and correction is digitally signed and linked to the document before it. Any tampering becomes detectable.
Gap-free numbering
Invoices follow a sequential numbering with no gaps and no duplicates, as the regulation requires.
Automatic closures
Daily, monthly and yearly closures are generated automatically, with sealed totals.
Technical event log
A technical log records system events and stays available for the whole retention period.
Six-year archiving
Signed archives are produced and kept for six years, as legally required.
FEC export and restitution bundle
During an audit, download the FEC file and the restitution bundle the tax authority expects, straight from your panel.
A verification QR code can also be added to your invoices.
Where SimplyBook.me stands on NF525 compliance
Since the 2026 finance law (law no. 2026-103 of 19 February 2026), the compliance of cash register software can be proven in two ways: with a certificate from an accredited body, or with the publisher's individual attestation.
SimplyBook.me now provides that individual attestation. It consists of the publisher part, which you download from your admin panel, and the user part, which you sign and then upload back.
In parallel, certification by an accredited body (INFOCERT / AFNOR) is running its course. It involves several audit and verification stages and adds to the attestation rather than replacing it.
We will update this page as soon as certification is granted.
Activate Fiscal Mode in four steps
Activation happens in your admin panel and requires no technical work.
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Step 1 /
Complete your fiscal identity
Enter your SIREN, your SIRET, your VAT number, your legal form, your RCS city and your share capital in your company profile.
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Step 2 /
Turn the feature on
In custom features, select Fiscal Mode (NF525) and set your VAT regime and your timezone.
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Step 3 /
Sign your attestation
Download the publisher part, sign the user part, then upload the signed document. Your attestation is then ready to be presented.
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Step 4 /
Carry on taking payments
Your invoices and payments are sealed automatically. Your day-to-day work stays the same.
Before you switch it on
Fiscal Mode cannot be switched off once it is active. That is precisely what makes your records stand up to the tax authority.
A finalised invoice can no longer be edited or deleted. A mistake is corrected with a credit note, which keeps a trace of the original entry and of its correction.
What this means for businesses in France
With Fiscal Mode active, French businesses using SimplyBook.me have:
- a signed, unalterable record of every payment taken
- an attestation of compliance available immediately, with no paperwork from a third party
- secure archiving of their data for six years
- an FEC export and a restitution bundle in the event of an audit
SimplyBook.me is used by many service businesses in France, in particular in these sectors:
Why choose SimplyBook.me to manage your appointments in France
SimplyBook.me is an international appointment and payment management platform built for service businesses. Its features include:
24/7 online booking
online and on-site payments
automatic email and SMS reminders
staff scheduling
activity reports and statistics
integrations with major payment providers
Our platform is used by over 100,000 service businesses in more than 100 countries, and it is continuously adapted to local regulatory requirements.
FAQ: NF525 and booking software
Is SimplyBook.me NF525 certified?
Is certification by an accredited body mandatory?
What do I have to present during a tax audit?
Can I switch Fiscal Mode off after enabling it?
How do I correct a mistake on an invoice?
How long is my data kept?
What is the penalty for non-compliance?
Stay informed
We will update this page as soon as certification by an accredited body is granted.
For any question about switching on Fiscal Mode or about your compliance in France, our support team is there to help.
Get started today
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