Peppol vs Clearance Model: E-Invoicing Models Compared
Clearance model e-invoicing vs Peppol: CTC, post-audit, 4-corner and 5-corner models, real-time reporting, and which countries use each model.
Quick answer: In a clearance model of e-invoicing, the tax authority (or its platform) must validate each invoice before it is legally valid or delivered, as in Italy, Poland and Saudi Arabia. Peppol is an exchange network: invoices travel between businesses' access points (four corners), and the tax authority audits later or receives a copy as a fifth corner. Both can be mandatory; they control different things.
When people compare e-invoicing countries, they often lump everything together. In practice there are a few distinct models, and the one your country uses decides what your software must do, how fast invoices move, and what happens when something goes wrong. This comparison explains each model in plain terms. For the Peppol network itself, see our explainer on what Peppol is.
The main e-invoicing models at a glance
| Model | Who sees the invoice first | Tax authority role | Examples |
|---|---|---|---|
| Post-audit | Buyer | Checks later, during audits or via VAT returns | Germany (e-invoices from 2025-2028, no live reporting), most countries for PDF invoices |
| Interoperability (4-corner, Peppol) | Buyer, via access points | None in the exchange; audits later | Belgium (2026), Peppol use in Norway, Australia, New Zealand |
| 5-corner (Peppol plus reporting) | Buyer, with data copied to the authority | Receives data in near real time | UAE, Slovakia (from 2027), Belgium (planned from 2028) |
| Real-time reporting | Buyer | Receives data soon after issue | Croatia, Greece (myDATA), Hungary, Spain (SII) |
| Clearance (centralised CTC) | Tax authority platform | Validates before the invoice is valid or delivered | Italy (SdI), Poland (KSeF), Saudi Arabia (standard invoices), India (IRP), Mexico |
| Decentralised CTC (platform model) | Certified platform | Receives data via platforms | France (approved platforms) |
What is the clearance model in e-invoicing?
In a clearance model, the invoice passes through a government platform before (or as) it reaches the buyer. The platform checks the format, the seller's registration and sometimes the arithmetic, then stamps or assigns an ID. Only a cleared invoice counts.
- Italy: invoices go through the Sistema di Interscambio (SdI), which delivers them to the buyer.
- Poland: invoices are issued in KSeF and receive a KSeF number; see KSeF and Belgium compared.
- Saudi Arabia: standard B2B tax invoices are cleared by ZATCA before being shared; simplified B2C invoices are reported within 24 hours. See ZATCA e-invoicing.
- India: invoices are registered on the Invoice Registration Portal and receive an IRN and signed QR code.
Pros and cons of clearance
- Pros: strong fraud control, one source of truth, easy access to received invoices via the authority's platform.
- Cons: dependency on the platform's uptime, rigid formats, and an extra step before you can send.
How the Peppol four-corner model works
Peppol connects businesses through certified access points. Corner 1 is the seller, corner 2 the seller's access point, corner 3 the buyer's access point and corner 4 the buyer. Invoices use Peppol BIS Billing 3.0 (based on EN 16931) or the newer PINT specifications. The tax authority is not in the flow. That makes Peppol fast and flexible, but on its own it gives the authority no live data. Our step-by-step guide on how to send a Peppol invoice covers onboarding.
What is the 5-corner model?
A five-corner model adds the tax authority as corner five. Invoices still travel over Peppol between access points, but the access points (or the parties) also send the tax data to the authority. It combines Peppol's open exchange with continuous transaction controls without making the authority approve each invoice first. The UAE's new system and Slovakia's 2027 regime are described this way, and Belgium plans to add reporting to its Peppol mandate from 2028.
Real-time reporting vs clearance
Real-time reporting sits between post-audit and clearance. You issue the invoice to your customer directly, and the data goes to the authority immediately or within days. The authority does not have to approve it first. Croatia's Fiscalization 2.0 is a good example: e-invoices move through intermediaries and data is fiscalized as they are exchanged, with payment e-reporting monthly. See our Croatia e-invoicing guide.
Hybrids are now common. France combines approved private platforms with reporting to a central government platform, which some describe as a "Y" or decentralised CTC model; see our France e-invoicing guide. Greece lets businesses issue through certified providers or free government tools while reporting to myDATA. The labels matter less than the three questions below: who approves, who sees the data and when, and which channel carries the invoice.
Peppol vs clearance model: side-by-side
| Peppol (4-corner) | 5-corner | Clearance | |
|---|---|---|---|
| Invoice valid when | Issued and delivered | Issued and delivered | Validated by the authority |
| Authority sees data | Later (audit, returns) | Near real time | Before or at delivery |
| Delivery channel | Any access point | Any accredited access point | Government platform or certified provider |
| Format | Peppol BIS / PINT | Peppol-based national spec | National spec (FatturaPA, FA(3), UBL for ZATCA, JSON for India) |
| If platform fails | Switch access point | Access point retries; reporting may lag | Contingency rules apply |
| Cross-border | Natural fit | Natural fit | Usually domestic only |
Worked example: one invoice under three models
A supplier invoices a customer for consulting: net 10,000, VAT at 15% = 10,000 × 0.15 = 1,500, total 11,500 (the same numbers in any currency).
- Clearance (Saudi Arabia style, SAR 11,500): the supplier's software generates signed XML and sends it to ZATCA. ZATCA validates and returns the cleared invoice. Only then does the supplier share it with the buyer. Elapsed time: usually seconds, if all fields pass.
- Peppol four-corner (Belgium style): the supplier sends the UBL file to its access point, which delivers it to the buyer's access point. The tax authority sees nothing until the VAT return.
- Five-corner (UAE style): as in the Peppol flow, but the access point also reports the tax data to the authority, so it has the data close to real time.
Belgium's actual standard VAT rate is 21% and the UAE's is 5%; the 15% figure keeps the arithmetic comparable. The arithmetic does not change between models. What changes is who must see the invoice, and when, before it counts.
Pros and cons of the Peppol model
- Pros: one connection reaches every registered receiver in any Peppol country; you can switch access point without changing your Peppol ID; it works naturally for cross-border invoices; the standards are open and based on EN 16931.
- Cons: both parties must be registered; on its own it gives the tax authority no live data, which is why countries add reporting; and small businesses still pay an access point provider or rely on accounting software that includes one.
What the e-invoicing model means for a small business
For a business sending a few dozen invoices a month, the model shows up in four practical ways:
- Timing. Under clearance, you cannot send the invoice until the platform responds. Build that into point-of-sale and same-day billing.
- Error handling. Clearance and 5-corner systems reject invalid invoices immediately. Post-audit and plain Peppol let errors through, to be found later by your customer or an auditor.
- Corrections. In clearance countries you cannot edit or delete a cleared invoice; you issue a credit note, which is also cleared. Plan your correction workflow before go-live.
- Visibility. In clearance and reporting countries, the authority already holds your sales data, so VAT returns are increasingly pre-filled and mismatches are flagged quickly.
In every model, keep your invoice numbering consistent and continuous; an invoice number generator can help you settle on a format before you configure your e-invoicing software.
Which model does your country use?
Look at three questions: does the authority have to approve the invoice, does it receive data in real time, and is the exchange open (Peppol) or through a government platform? Our e-invoicing mandates 2027 list gives the model for each country. Across the EU, the ViDA reform pushes everyone towards EN 16931 data plus digital reporting by 2030-2035.
Common mistakes when choosing a solution
- Assuming a Peppol access point covers a clearance country. Some providers do both, but they are different integrations.
- Ignoring contingency rules in clearance countries.
- Thinking post-audit means "no rules". Germany still requires EN 16931 formats and archiving.
- Forgetting receiving. In every model you also need to receive and store structured invoices.
Checklist: questions to ask an e-invoicing provider
- Which countries and models do you support (Peppol, 5-corner, clearance)?
- Are you a certified Peppol access point or accredited provider where required?
- Do you handle contingency and retry when the authority's platform is down?
- Do you archive the original structured files for the legal retention period?
- What does it cost at my invoice volume?
Where a PDF generator fits
None of these models accept a plain PDF as the legal invoice for in-scope sales. Our free invoice generator is still useful for quotes, proformas, B2C invoices and countries without a mandate, and we say so plainly: it does not connect to Peppol or any tax authority.
Next step
Identify the model in each country you invoice in, then choose a provider that supports all of them. If your main market is a Peppol country, start with how to send a Peppol invoice.
Frequently asked questions
Is Peppol a clearance model?
Not on its own. Peppol is a network for exchanging invoices between businesses through access points, and the tax authority is not in the middle of each exchange. Some countries add the tax authority as a fifth corner, so invoice data is reported as it flows over Peppol, but that is still reporting rather than prior approval.
What does CTC mean in e-invoicing?
CTC stands for continuous transaction controls: the tax authority receives invoice data at or near the time of the transaction instead of waiting for periodic VAT returns or audits. Clearance and real-time reporting are both forms of CTC; the difference is whether the authority must validate the invoice before it is valid.
Which model is cheapest for a small business?
It depends more on the tools available than on the model. Several clearance countries offer free government portals for low volumes, and several Peppol countries have low-cost access point plans. The real cost is usually changing your workflow, so compare what your accounting software already includes.
Can a country switch models?
Yes, and many are moving toward hybrids. Belgium started with Peppol exchange in 2026 and plans to add e-reporting in 2028, and ViDA requires national real-time systems to converge with the EU model by 2035. Expect more countries to combine Peppol-style exchange with tax authority reporting.
What happens if the clearance platform is down?
Clearance countries publish contingency procedures, such as issuing offline and submitting once the system is available again, or extended deadlines. The details differ by country, so check your tax authority's fallback rules and make sure your software supports them.
What is a post-audit model of e-invoicing?
In a post-audit model, businesses exchange invoices directly, on paper, by PDF or as e-invoices, and the tax authority only checks them later through VAT returns and audits. It is the traditional approach and still applies in many countries without mandates, such as the US and, for now, the UK. Peppol can operate inside a post-audit model, adding structure without real-time reporting.
What is a decentralized CTC model?
A decentralized continuous transaction control (DCTC) model combines Peppol-style exchange between certified service providers with reporting of invoice data to the tax authority. The authority receives data as invoices flow but is not a gatekeeper before delivery. The UAE's five-corner model is an example, and France uses approved platforms that exchange invoices and transmit data in a similar way.
Who can see my invoice data in each model?
In a clearance model the tax authority sees every invoice, usually in full, before or as it reaches your customer. In a pure Peppol exchange, your access point, your customer's access point and your customer handle the invoice, and the tax authority sees it only if a fifth corner or reporting rule applies. Check each provider's data storage and privacy terms either way.
Can one software provider handle both Peppol and clearance countries?
Yes, many e-invoicing providers support several countries, connecting to Peppol as an access point and to clearance platforms such as Italy's SdI, Poland's KSeF or Saudi Arabia's Fatoora. This is useful if you trade in several countries. Check which countries each provider actually covers today, rather than on its roadmap, and whether it handles receiving as well as sending.
When is an invoice legally issued in a clearance model?
Usually only after the tax authority's platform has validated it and assigned an identifier, such as a KSeF number in Poland or clearance by ZATCA in Saudi Arabia. A document sent before clearance is not a valid invoice, even if it looks complete. That affects when your customer can deduct VAT and how you handle errors, so follow your country's rules carefully.
Invoice Creator Editorial Team
Guides on invoicing, cash flow and small-business finance from Invoice Creator, operated by Next Software Development Company. Content is reviewed for accuracy against the fields our own invoice generator produces.
Try the invoice generator