Across the EU, e-invoicing has turned from a nice-to-have into the law. Belgium's mandate has been live since January 2026; Germany already requires businesses to be able to receive structured invoices; from September 2026 every business in France — down to the solo micro-entrepreneur — must do the same. For a company with an accounting department, that's a project. For a freelance designer, a one-person consultancy, or a shop that has always sent a PDF from Word, it's a wall: their invoicing tool doesn't speak ZUGFeRD, Factur-X, XRechnung or Peppol.

Invonio is a focused e-invoicing tool with nothing to lock you into — no tax-filing subscription hiding behind a free hook, just honest, fixed pricing. It launched in beta at invonio.talivio.com in early July, and in the days since, its scope has grown considerably: live delivery over the Peppol network, a permanently free receiving tier, and a public validator anyone can use without an account.

One Invoice, Every Format the EU Asks For

Behind Invonio is a single canonical invoice model that exports to every format the mandates require: XRechnung in both its CII and UBL flavors, Peppol BIS 3.0 UBL for network delivery, and ZUGFeRD / Factur-X — the hybrid format where a human-readable PDF carries the machine-readable XML embedded inside it as a PDF/A-3 attachment. Enter the invoice once; download whichever standard the recipient or the tax authority needs. VAT is calculated and grouped exactly the way the EN 16931 European standard requires — including the cases most invoicing tools get wrong, like Germany's Kleinunternehmer (§19 UStG) exemption and intra-EU reverse charge, both handled as first-class options rather than an edit you have to fake.

Real Invoices, Not Just a First Draft

Invonio covers the parts of running invoices that only show up after the first one: line-item or document-level discounts, invoices with mixed VAT rates shown correctly rather than lumped into one line, automatic sequential numbering, editable drafts that lock the moment they're sent (a legal requirement, not a UI choice), and proper credit notes that reference the original invoice. The PDFs themselves grew up too: your logo on the document, the invoice language chosen per document rather than tied to your interface language, and an EPC payment QR code on every invoice — the kind European banking apps scan to pre-fill the transfer, so customers can pay you in seconds.

Live on the Peppol Network

The biggest change since launch: sending over the Peppol network is no longer a roadmap item — it's live, through an accredited access point. Invonio verifies your recipient against the Peppol directory while you're still filling in the form, so a typo in a participant ID fails in the editor instead of hours later in transit. Once sent, every invoice carries a live delivery status — queued, submitted, processing, delivered — instead of the email-era shrug of "it probably arrived." France's dedicated PDP channel is wired in alongside Peppol, aimed squarely at the accredited-platform requirement French businesses are facing. And receiving stays first-class: invoices sent to you over Peppol are filed automatically into the right business inbox, parsed and readable whatever format the sender used — credit notes included.

Check Any Invoice, Free, No Account

The EN 16931 conformance validator also graduated from the roadmap — and it's public. Drop any e-invoice — ZUGFeRD, Factur-X, XRechnung or Peppol, PDF or raw XML — into the free validator and get a full standards-compliance report, no account required. It runs the exact same validation engine the app itself uses. Next to it sits a mandate timeline tool: pick your country and situation, and see precisely which e-invoicing deadlines apply to you, ViDA milestones included.

Free to Receive. Paid to Issue. Nothing in Between.

The 2026 mandates are, first and foremost, about being able to receive structured invoices — so that part of Invonio is now free forever, no card required: receive e-invoices, validate them, and keep them in a compliant archive with SHA-256 fingerprints built for Germany's GoBD retention rules, at no cost. Issuing your own invoices is the paid product, and the pricing stays as honest as it started: the first 500 accounts get the Founding Price of €24/year, locked for as long as you stay subscribed; everyone after pays the list price of €39/year. The Business tier, for accounting firms and integrators who need the API and multi-client billing, is €29/month. New since launch: a referral program — invite another business and they get 10% off their first year, while you get a free month once their subscription sticks.

API-First, So It Grows With You

The web app and the REST API sit on the exact same service layer — anything you can do by hand, you can automate. Mint your own bearer tokens and reach the same endpoints a freelancer's browser hits: create invoices, generate documents, send them over Peppol, pull incoming ones. There's now a proper developer page with a full OpenAPI specification, so wiring Invonio into a shop, a SaaS, or an accounting practice's tooling no longer starts with guesswork. Multi-client support runs deeper too: each business you manage can get its own verified identity on the Peppol network — the foundation the Business tier is built on.

Take It With You

The companion mobile app for iOS and Android kept pace: build and send an invoice from your phone, watch its live delivery status, and verify a recipient's Peppol registration right in the editor — the same account, the same invoices, the same API underneath, in English, German or French with locale-correct dates and currency formatting. And with Talivio Accounts now live across our products, one Talivio sign-in covers Invonio on the web and on your phone.

Where It's Going

The mandate map sharpened since launch. Belgium — where the B2B mandate is already in force and runs on pure Peppol — is territory Invonio serves today, and it's the next market focus. France's September 2026 receiving wave and the 2027 issuing waves follow, with the PDP channel already in place; Germany's timeline keeps rolling through 2027–2028; Spain's Verifactu requirements are on the horizon after that. The goal never changes: keep the smallest business on the right side of the law in about a minute, without asking it to buy a tax subscription it doesn't want.

Update (August 2026)

Since this post, Invonio's mobile app has actually shipped — it is live on the App Store and Google Play, and one Talivio Accounts sign-in now covers the web app and the phone. The validator got stricter: when the conformance service cannot be reached, Invonio now reports "could not be checked" instead of passing the document, and XRechnung output carries the seller phone number German rule BR-DE-6 requires. Two claims above need narrowing: managing several businesses from a single login is not available today (each account maps to exactly one business, though every business still gets its own verified Peppol identity), and Belgium is a planned market rather than a served one — the Dutch interface and inbound Peppol registration still have to be built. France runs through the integrated PDP channel described above, verified end to end in the provider's pre-production environment.