The 2026 e-invoicing mandate adds real tax compliance work across France, Belgium and the rest of the EU, but the honest answer for a finance team is that it does not need another per transaction subscription to absorb it. Telones, our sovereign tax engine, determines the rate, computes the liability and prepares the return on your own hardware, then seals the working with the authorities it relied on into a signed audit record, so the recurring cloud fee disappears while the evidence stays under your control.
The 2026 e-invoicing mandate is now a live tax compliance cost
Belgium made structured B2B e-invoicing over the Peppol network mandatory from 1 January 2026, and France begins its domestic B2B mandate in September 2026, with the largest enterprises issuing first and every business required to be able to receive. Both sit under the EU's VAT in the Digital Age reform, which points the whole bloc towards near real time digital reporting later in the decade. Industry guidance for 2026 describes a tax automation scramble, as companies operating across jurisdictions line up formats, access points and reporting for each country at once. The pressure is real, but the way most teams are being sold the answer is another metered platform on top of the ones they already run.
What it costs you to comply the rented way
The determination and reporting layer is where the meters live. Vertex and Avalara bill for rate determination and return preparation, often per transaction and per return. Thomson Reuters ONESOURCE and Wolters Kluwer CCH licence by entity, module and seat. On top of the licence sits cloud egress on the data you send out, storage for the documents you keep, and the seasonal contractor hours that quarter end filing peaks still demand. Each new jurisdiction the mandate touches is another line on the same invoice, and the meter runs whether or not a given quarter is busy. The workload the mandate creates is genuine; the recurring bill attached to it is a choice.
How Telones runs the tax engine on hardware you own
A studio is a ready made application for one business function inside a single system, and Telones is the studio for tax: it runs on your own machines rather than a vendor's cloud. It determines the rate and treatment, computes the liability and the provision, and runs the indirect tax and withholding rules as versioned decision tables, so every figure traces back to a rule you can read and a version you can pin. Because it runs offline, the invoice and transaction data it reads never leaves the building, which removes the cross border transfer question the mandate raises and the egress charge that comes with sending records to a cloud service. It is reference and preparation support rather than tax advice, and your specialists review and sign off exactly as they do today.
The audit trail is sealed, not commissioned
Under the mandate the working has to stand up to inspection. Every action Telones takes is sealed under post quantum cryptography into the Open Audit Record, a signed trail that shows the authority each determination rested on and the version of the rule applied. That record is generated as the work happens rather than reconstructed afterwards, and it supports the examinations an auditor or a tax authority will run, without any claim that a certification is held on your behalf. The Assistant that drives the studio runs on your company's own brain, built on your own data, so the whole chain from source document to sealed return stays on hardware you control and you decide who sees it.
What you replace, and what you save
| What you run today | What it costs you | With Mickai |
| --- | --- | --- |
| Vertex cloud determination | Per transaction determination calls plus an annual platform fee | Rate determination on your own hardware, with no per call meter |
| Avalara returns | Per return and per filing charges, with seasonal add ons at peaks | Return preparation in house, with no per return charge |
| Thomson Reuters ONESOURCE | Per entity and per module licences, plus cloud egress on your data | One owned engine across entities, with no egress |
| Wolters Kluwer CCH | Per seat determination and per return seats | Versioned decision tables you own, with no per seat meter |
| Cloud document storage and egress | Per document storage and transfer fees on records you keep | Sealed working held locally, with no per document cloud fee |
| Quarter end contractor hours | Overtime and agency spend on every filing peak | Repeatable preparation absorbs the volume in house |
How the sovereign tax engine prepares a return
- Load invoice and transaction data locally, so nothing leaves the machine.
- Determine the rate and treatment for each jurisdiction against curated, versioned rule sets.
- Compute the liability and the provision, with each figure showing the authority it rests on.
- Prepare the return and the supporting working paper in house, ready for your specialist to review.
- Seal the completed working to the Open Audit Record under post quantum cryptography, ready to show an inspector.
Frequently asked questions
Does Telones file my e-invoices or replace my Peppol access point?
No. Telones is the determination and return preparation layer that computes the liability and seals the working. Transmission over a network such as Peppol stays with your chosen access point. What changes is that the metered determination and return preparation, the part vendors bill per transaction and per return, moves onto hardware you own.
How does running on premise cut the cost of the 2026 mandate?
The recurring charges on the determination and reporting layer are per transaction, per return and per seat, plus cloud egress and storage. Running the engine offline on your own machines removes those meters. You still buy and maintain hardware, but the variable cloud bill that grows with every jurisdiction and every filing stops growing with it.
Can the sealed audit trail satisfy an inspection?
The Open Audit Record is a signed trail that shows the authority behind each determination and the version of the rule applied, sealed as the work happens. It is built to support the examinations an authority or auditor runs. We do not claim any certification is held on your behalf; the record is evidence you produce and control.
Is this tax advice?
No. Telones is reference and preparation support. It prepares the working and shows the authorities behind each figure so your qualified specialists can review and sign off, exactly as they do with today's tools.
