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5-corner Peppol CTC. Invoices flow Corner 1 → Corner 2 → Corner 3 → Corner 4. Tax data is reported to the Financial Administration (Corner 5) within 5 days. No pre-clearance step — invoices don't wait on government approval before they're valid.
Peppol BIS 3.0 & Digital Postman-Ready e-Invoicing
PDFs Stop Counting as Invoices in Slovakia From 2027.
Act No. 385/2025 makes structured e-invoicing and real-time tax reporting mandatory for all domestic B2B and B2G transactions from 1 January 2027. ClearTax gets you Peppol BIS 3.0 and Digital Postman–ready, without touching your ERP.
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1 Jan 2027Issuing and receiving structured e-invoices becomes mandatory for domestic B2B and B2G
€10,000Penalty per breach, and up to €100,000 for repeat offences
No thresholdEvery VAT-registered entity is in scope from day one
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Slovakia Compliance Guide — Key Implementation Timeline
1 Jan 2026
Phase 1 — Voluntary Pilot
Act 385/2025 in force. Accredited Digital Postman list in progress; Financial Administration opened voluntary e-reporting registration from Q2 2026, per Guide No. 1/DPH/2026/I.
Open now
1 Jan 2027
Phase 2 — Mandate Live
Issuing and receiving Peppol BIS Billing 3.0 e-invoices becomes mandatory for all domestic B2B and B2G transactions. Real-time TDD reporting to the tax authority begins.
Key deadline
1 Jul 2027
Phase 3 — Delivery Service Only
Certified Digital Postman delivery becomes the only accepted transmission channel for in-scope transactions. No alternative formats accepted.
Then
1 Jul 2030
Phase 4 — ViDA Cross-Border
EU ViDA Pillar 1 extends scope to intra-EU, export, and import flows. The Tax Data Document replaces the VAT Control Statement (kontrolný výkaz) and EC Sales List.
Phase four
Regulatory watch
A proposed amendment (LP/2026/282, submitted 27 May 2026) would soften the rollout:
- A penalty-free grace period from 1 January–31 March 2027
- And the buyer-side data reporting obligation deferred from 1 January 2027 to 1 July 2030.
This has not been enacted as of this writing; the 1 January 2027 issuance mandate itself is unchanged either way. ClearTax tracks this and will update your compliance calendar the moment it's confirmed.
Slovakia's Mandate, in Four Facts
Every Slovak VAT payer must issue; every taxable person must be able to receive. Domestic B2B and B2G only. No revenue threshold.
Peppol BIS Billing 3.0 (UBL 2.1 XML), EN 16931-compliant. No national CIUS. PDFs and emails don't count as invoices from 2027.
A certified Digital Postman is required for transmission on both sides. The Financial Administration is Slovakia's national Peppol Authority.
Six Things to Get Right Before 1 January 2027
Confirm your scope.
Domestic B2B and B2G — no threshold applies, so every VAT-registered entity is in scope from day one.
Map your current invoice format against EN 16931 / UBL 2.1.
PDFs, EDIFACT, and unstructured XML won't qualify after the mandate goes live.
Select and onboard an accredited Digital Postman.
You'll need one to send and one to receive — ClearTax can be both.
Test issuance and receipt during the 2026 voluntary pilot.
The pilot window exists precisely so you're not troubleshooting live in January 2027.
Build real-time TDD reporting into your invoice workflow.
The reporting window is measured in days, not weeks — this has to be automatic.
Set your archival policy now.
10-year retention applies generally, 20 years for real estate-related invoices.
How It Works
Slovakia e-invoicing 5-corner Peppol CTC model, with ClearTax acting as the certified Digital Postman on both the seller's and the buyer's side.
Corner 1SellerYour ERP, billing or POS
Invoice data →← Response
Corner 2ClearTaxSeller's service provider
Tax Data Document →← Response message
Corner 5Financial AdministrationReported within 5 days
Peppol network
Corner 4BuyerDelivery confirmation
← Invoice dataAcknowledgement →
Corner 3ClearTaxBuyer's service provider
Tax Data Document →← Response message
Corner 5Financial AdministrationBuyer-side reporting
No pre-clearance step: the invoice is valid on delivery, and tax data follows to the Financial Administration inside the 5-day window.
Peppol BIS 3.0 Issuance & Receipt
Auto-generate and validate UBL 2.1 XML against EN 16931 before it ever leaves your system — errors get caught before transmission, not after a rejection.
Real-Time TDD Reporting
The Tax Data Document is built and reported to the Financial Administration automatically, inside the 5-day window — no manual reconciliation step.
ERP-Native Integration
Connects to SAP, Oracle, Microsoft Dynamics, and others without re-platforming. Typical go-live in 2–4 weeks.
Digital Postman Transmission
Certified 5-corner delivery for both AR and AP, with delivery confirmation and acknowledgement tracked in one dashboard.
Compliant Archival
10-year retention (20 years for real estate) built in — audit-ready without a separate archiving project.
Security & Privacy
ISO 27001-certified infrastructure
GDPR-aligned data handling for EU operations
End-to-end encrypted transmission across the Peppol network
Role-based access control and full audit trails on every invoice event
Hear it from our partners
ClearTax has transformed the way we handle GST compliance. Real-time creation of e-Invoices and e-Way bills plays a significant role in providing us with critical insight into our business.
ClearTax is simplifying e-Invoicing. They enabled us to implement the e-Invoicing system in time and handled all our business complexities with ease. Thank you for the effort and good job!
We appreciate ClearTax for successfully completing the complex ZATCA E-Invoicing Phase II Integration project. Their platform enabled seamless management of multiple business units. Kudos to the team for their timely delivery.
Collaborating with ClearTax was an exceptional experience. They streamlined the entire process, even under tight deadlines, and worked closely to address the unique challenges of e-invoice integration with our diverse ERP systems.
FAQs
Mandatory structured e-invoicing and real-time reporting for domestic B2B and B2G transactions begins 1 January 2027, under Act No. 385/2025. 2026 is a voluntary pilot year.
Every VAT-registered business in Slovakia — no revenue threshold. All must be able to issue and receive compliant e-invoices.
Peppol BIS Billing 3.0 in UBL 2.1 XML, compliant with the EN 16931 European standard. There's no Slovak-specific CIUS. PDFs and emailed invoices won't be valid from 2027.
No. Unlike the earlier B2G-only rules (which applied a €5,000 procurement threshold), the B2B mandate has no threshold.
Penalties run up to €10,000 per breach, and up to €100,000 for repeat offences. Honest mistakes corrected promptly aren't penalised.
Yes — transmission must go through a certified Digital Postman on both the sending and receiving side. ClearTax can act as your Digital Postman for both AR and AP.
Cross-border and ViDA-aligned digital reporting requirements extend from 1 July 2030, when the Tax Data Document also replaces the VAT Control Statement and EC Sales List domestically.