Electronic invoicing through El Fatoora is a legal obligation in Tunisia, not an efficiency project. For VAT-liable businesses the question is no longer whether to adopt it, but how to connect the systems already running the business to it.
The part most vendors get wrong
The usual proposal is to replace your invoicing system. That is the most expensive possible answer to a format-and-transport problem, and it puts a migration between you and compliance.
Almost every business already has something that produces invoices: an ERP, an accounting package, a custom internal tool, sometimes a spreadsheet feeding a printer. The compliance requirement is that invoices leave that system as TEIF XML, carry a valid electronic signature, and reach TTN. None of that requires throwing away what produces the invoice in the first place.
What an integration actually involves
Mapping your data to TEIF. Your invoice records already contain the parties, line items, tax rates and totals. The work is mapping those fields onto the TEIF structure correctly, including the cases that break naive mappings: credit notes, multi-rate VAT, exonerations, foreign-currency lines.
Signing. Invoices must be signed with a certificate from ANCE / TunTrust. That means a signing step your system can call reliably, with the certificate handled properly rather than pasted into a config file.
Transmission and acknowledgement. Sending to TTN is only half of it. The platform answers, and those answers have to be read, stored, and surfaced to whoever needs to act on a rejection.
Archiving. Signed invoices and their acknowledgements have to be retained and retrievable for the legal period, which is a storage and search problem, not a formatting one.
Which certificate your system needs
A person can sign invoices one by one with a personal certificate. A system that sends invoices on its own needs a company seal certificate, issued in the name of the business and made for automatic signing of large volumes without anyone clicking.
Three points a qualified provider confirmed to us in writing in October 2026:
- The seal certificate is issued for one or two years, and the price depends on that duration. Plan the renewal date from day one.
- Each company signs with its own seal. A software publisher cannot sign for all its clients with a single certificate.
- Several entities can share one certificate only when they have the same legal representative.
In an integration we connect your system to the provider’s signing service, so the certificate stays with the provider and never sits in a file on your server.
The El Fatoora compliance audit: 1,200 TND excl. VAT, fixed price
Before any build, we run a short audit of how you invoice today. You know the price before we start, and you get the result within 5 working days.
What we look at: where your invoices are produced, what the data looks like, and what is missing to emit signed TEIF XML and send it to TTN.
What you get: a written document that answers three questions.
- What your system already does correctly.
- Exactly what is missing for TEIF, signing and TTN transmission.
- What the integration would cost, as a fixed price.
It is written so your own IT person could act on it, even if you never hire us. If you give us the integration within 30 days, the audit fee comes off the invoice.
If your system genuinely cannot be adapted, the audit says so. We also build invoicing platforms from scratch, so we have no reason to force an integration that will not hold.
To start, book a 15 minute call: calendly.com/axynoxia/axynoxia-discovery-call
Read the rules first
Our series on the Tunisian rules cites the official texts: who must issue electronic invoices, TEIF and the electronic signature, choosing software or connecting your ERP and penalties and common mistakes. Our own invoicing platform, Axynoxia Invoice, is prepared for El Fatoora.