E-Invoicing in Estonia – Requirements, Standards and Compliance

E-Invoicing in Estonia

Estonia’s government and tax authorities have gradually introduced an electronic invoicing regime under the national Accounting Act, with related updates to the Value Added Tax Act. This transition affects how businesses issue, receive, and validate invoices. The system makes structured e-invoicing mandatory or optional depending on circumstances for certain transactions, changing the way companies invoice across both public and private sectors. 

The regime aims to improve transparency, reduce administrative burden, streamline accounting, and support digital transformation in Estonia. This blog explains the requirements of the system, key dates, technical process, benefits, and how providers like Flick Network could help companies comply with the new law.

What is E-Invoicing in Estonia

E-invoicing in Estonia refers to issuing, validating, transmitting and storing invoices electronically in a structured data format rather than using paper-based invoices or simple PDF or email invoices. Each invoice is generated by an accounting or invoicing system, for example an ERP or accounting software, in a machine-readable format such as XML complying with the European standard, and, where applicable, transmitted via a certified e-invoicing network or platform.

Invoices that are merely PDF attachments or scanned copies do not qualify as “e-invoices” under the law. Once issued in the required structured format and transmitted if needed, the business retains the electronic record, allowing both supplier and buyer, and when relevant the public sector or auditor, to access and audit the transactions. The system eliminates manual data entry, ensures data accuracy, and provides traceability across business interactions in Estonia.

Estonia’s E-Invoicing Timeline and Important Dates

• 1 July 2019: E-invoicing became mandatory for all transactions where a business supplies goods or services to public sector entities such as government, local authorities, and public-law bodies, meaning Business-to-Government (B2G) invoices must be e-invoices.

• 18 September 2024: The national parliament passed amendments to the Accounting Act to broaden the e-invoicing framework.

• 1 July 2025: Under the amended law, any business entity registered as an “e-invoice recipient” in the Estonian business register gains the right to demand structured e-invoices from its suppliers, applying to B2B (Business-to-Business) as well as B2G. The default technical standard for e-invoices becomes the European standard EN 16931, unless both parties explicitly agree to another format.

• 2027 (expected): The government has indicated a plan to make e-invoicing mandatory for all domestic B2B transactions and to abolish certain existing thresholds for VAT reporting, however final legislation is still pending.

Who Must Follow Estonia’s E-Invoicing Rules (As of 2025)

• All suppliers to public sector entities, including state, municipalities, and publicly controlled bodies, must issue e-invoices for B2G transactions.

• From 1 July 2025 onwards, any business, private or public, that has registered as an “e-invoice recipient” in the commercial register has the right to require structured e-invoices from its suppliers. If the supplier fails to provide such e-invoices when requested, the buyer may refuse to accept non-structured invoices. For private-sector buyers who are not registered, sending e-invoices remains optional.

• For regular B2B transactions between unregistered entities, meaning neither party registered as e-invoice recipient, e-invoicing remains voluntary for now.

• There is currently no mandate for Business-to-Consumer (B2C) e-invoicing.

Technical Rules and E-Invoicing Process in Estonia

• Invoice Format: E-invoices must conform to a structured data standard. The default is the European EN 16931 standard, for example UBL or Peppol BIS Billing 3.0 XML. The legacy Estonian national format, EVS 923 or “e-arve”, remains permitted if both parties agree.

• System Integration / Accounting Software: Businesses should use accounting software or ERP systems capable of generating machine-readable e-invoices. Many commercial accounting systems in Estonia support this. For small or new businesses, the state-provided software eFinancials, by the Centre of Registers and Information Systems (RIK), is available, allowing businesses to produce and send e-invoices without additional cost.

• Transmission Channels: Invoices between businesses or to public sector entities can be exchanged through private service providers, via the Peppol network, or via other e-invoicing operators. Estonia follows a decentralised model rather than a central government-run platform. Roaming agreements ensure interoperability among different providers.

• Archiving / Record Keeping: E-invoices and related data must be stored in electronic archives for at least seven years. Archived records must be retrievable and available for audits in line with accounting and VAT rules. The seller’s physical signature is not required.

Benefits of E-Invoicing in Estonia

• Efficiency: Sending and creating invoices electronically reduces manual paperwork and speeds up the invoicing process.

• Accuracy: The structured format of data reduces the occurrence of manual errors in the creation of invoices, thereby enhancing the coherence and clarity of the invoice information.

• Traceability and Audit Readiness: With the electronic archives, traceability of invoices and audit readiness become easier for companies and authorities, enhancing transparency.

• Flexibility and Choice: From 1 July 2025, businesses can voluntarily adopt e-invoicing, including in response to recipient requirements, without a full B2B mandate in place.

• Cost Savings: Less use of printing, mailing, and keeping manual records decreases costs over time.

• Cross-border Interoperability: Adopting the European norm EN 16931 or Peppol BIS allows for easier cross-border invoicing and interoperability with EU partners.

Consequences for Failing to Comply in Mandatory Cases

• For B2G transactions: In the event of a supplier's failure to issue a structured e-invoice, that invoice would be refused by the public-sector system and, in effect, even delayed or refused payment.

• If the buyer has requested an e-invoice for B2B: A supplier refusing or unable to deliver may lose a business opportunity or be in a difficult negotiation position, as the buyer has the right to demand an e-invoice.

• Operational disruption: Many companies, if not appropriately equipped with software or systems, fail to adapt. The results are delayed invoicing and payment cycles.

How to Prepare for E-Invoicing in Estonia

• Assess your systems: See whether your accounting or ERP software currently supports one of the structured e-invoice formats, like EN 16931, UBL, or Peppol BIS, and also allows transmitting invoices electronically.

• Registration as a recipient of e-invoices: If your undertaking wants to have the right to demand e-invoices from your suppliers, make sure it is registered in the Estonian business register as an "e-invoice recipient".

• Choose a Solution or Provider: You may use commercial accounting software or services, rely on free state-offered tools such as eFinancials (provided via RIK) for small or new businesses, or use compliance-driven platforms like Flick Network to generate, transmit, and archive structured e-invoices in line with Estonian requirements.

• Connecting and verifying: Set up your software to produce valid e-invoices, verify their successful transmission if necessary, and determine whether your suppliers/clients can accept and process them correctly.

• Training your personnel: Accounting/Billing staff must be trained to properly generate structured e-invoice files and maintain digital archives as well as utilize all steps required in the new e-invoicing process.

How Flick Network Helps Businesses with E-Invoicing in the Estonia

Flick Network provides a compliance-driven invoicing platform tailored for businesses of all sizes in multiple jurisdictions. For the Estonia context, the platform can support the transition to structured e-invoicing by offering:

• Structured Invoice Generation: Flick will format invoices automatically in structured data formats (UBL/Peppol XML) aligning with Estonia’s EN 16931 or agreed national e-invoice standards.

• Submission and reporting: Facilitate the bundling of invoice data and its transmission to registered recipients via the Peppol or other approved networks, supporting validation, tracking, and secure delivery.

• Invoice Archiving and Tracking: All validated invoices and transmission logs are stored digitally with full traceability for audits, internal reporting, and compliance monitoring according to Estonian accounting and VAT regulations.

• ERP/Billing System Integration: Flick integrates with your current ERP, POS, or accounting software to reduce manual work, standardize invoice workflows, and enable scalability.

• Continuous Support for Compliance: The platform incorporates regulatory change updates, compliance of data formats, versioning, and onboarding support, which are necessary for maintaining alignment with Estonia's e-invoicing regulations.

Conclusion

Estonia’s evolution toward mandatory e-invoicing, from public-sector only to a buyer-choice model in 2025, and potentially a full B2B mandate by 2027, marks a significant shift in how businesses handle invoicing. From 1 July 2025, registered companies can demand structured e-invoices, and suppliers must comply if requested. The adoption of the European standard, EN 16931, ensures uniformity and cross-border compatibility.

Early preparation, evaluation of software, proper registration, implementation of compliant billing solutions, staff training, and digital archiving should all be noted for businesses operating within the boundaries of Estonia. Platforms such as Flick Network could make this transition easier for businesses of all scales to adapt seamlessly to the newer version of e-invoicing.

FAQs

1. What invoice format is required in Estonia?
    The default format is the European standard EN 16931, such as UBL or Peppol BIS. The older Estonian national format, EVS 923 or “e-arve”, may still be used if both parties explicitly agree.

2. Can I still send PDF invoices in Estonia?
    No. PDF invoices or scanned copies do not qualify as e-invoices under Estonian law.

3. Is there a government portal or central platform for e-invoicing in Estonia?
    Estonia uses a decentralised model. Businesses can issue e-invoices through accounting software, Peppol, or private service providers. The state-provided tool eFinancials, via RIK, is available for eligible businesses.

4. Does e-invoicing apply to consumers in Estonia?
    No. E-invoicing is not mandatory for Business-to-Consumer (B2C) transactions in Estonia.

5. What happens in Estonia if a supplier does not send a required e-invoice?
    For public sector buyers in Estonia, the invoice will be rejected. For B2B transactions where the buyer has requested e-invoices, the buyer may refuse to accept non-structured invoices.