PEPPOL and the government agency invoice: is it mandatory?

Short answer: You must send a machine-readable e-invoice to an Estonian public sector buyer, but PEPPOL itself is not a legal obligation. As of 01.07.2025, the "buyer chooses" principle applies in the Accounting Act: An accounting entity registered as the recipient of an e-invoice in the e-business register has the right to request an e-invoice from the seller. (RPS § 7¹ (7)), and an invoice that complies with the EN 16931-1 standard is considered to be proper. The parties may also agree on another relevant standard. The Ministry of Finance notes that all public sector entities are registered as recipients of e-invoices in the commercial register, although exceptions can now be made by the buyer if desired. So a PDF invoice sent by email to a ministry, city government or university is not a secure default option. PEPPOL is one common channel for delivering such an invoice, not a separate legal requirement.

Why isn't PDF the default option with email?

The Ministry of Finance says directly that an e-invoice is not just a picture of an invoice, but a machine-readable file prepared based on a common standard that moves from the seller's software to the buyer's without manual input. PDF does not do this. The accounting department of a state agency expects a structured file, and PDF remains there - for human reading.

Yes, public sector buyer may to make an exception from 2025. But that is his decision, not yours. If the agreement is in PDF, take it out of the contract or correspondence as readable. According to Section 7¹ (1) of the RPS, the format remains a matter of agreement between the parties only unless another legal act provides otherwise.

What is the difference between PEPPOL, EN 16931 and e-invoice?

EN 16931 is the European e-invoice standard: it says which data fields are on the invoice and what they mean. PEPPOL is a network and technical agreement on how the bill moves from one operator to another. Between them is a specification: Peppol BIS Billing 3.0 is an EN 16931 implementation guide or Core Invoice Usage Specification. The corresponding invoice therefore also complies with EN 16931.

That is why in Estonia the "Peppol invoice" is referred to as the European standard invoice. The ministry emphasizes at the same time that both the Estonian and European e-invoice standards are permitted, as the principle of format freedom applies.

Does the invoice amount affect the e-invoice obligation?

The register shall include: ID of the recipient of the e-invoice and its processor or other information about the receiving channel (RPS § 7¹ (3)). The revised provisions do not contain any financial limits: no minimum invoice amount, turnover or procurement contract threshold. An invoice of 120 euros and an invoice of 120,000 euros are subject to the same rule. Therefore, the buyer must be checked, not the invoice amount.

Background: In 2019, a general obligation to submit e-invoices was introduced in Estonia for public sector buyers, in 2025 it was replaced by the buyer's right of choice and extended to the private sector. On the EU side, it obliges Directive 2014/55/EU requires public contracting authorities to accept e-invoices that comply with the European standard.

What to check before sending?

• Legal buyer and registry code: The invoice recipient is the institution, not the department or project manager. The registry code is needed for the next step.
• Registry entry: e-business register e-invoice recipients query (available from 01.05.2017, no contract required) returns registry code, name, service provider ID and status. "OK" means valid connection.
• References: contract number, procurement or purchase order reference. None of the sources reviewed provide a single, mandatory nationwide reference field, so ask the buyer for this information before the first invoice.
• Shipping channel: your accounting software or e-invoice operator. The Ministry also lists E-invoicer among Estonian operators. You do not need your own PEPPOL Access Point.

Example: 1200 euro invoice for three government clients

The same training service invoice in the amount of 1200 euros goes to the ministry, the municipal government and the university. All three are e-invoice recipients in the register, but their service providers may be different. You do not choose this: Your operator or software directs the invoice to the channel indicated in the register.

One nuance is worth remembering. If the contract states that you will use the Estonian e-invoice standard, then the invoice will be sent in this format, because the agreement takes precedence over PEPPOL. And if the buyer does not have the status "OK" in the request, this does not automatically mean permission to send the PDF. Ask the buyer in what format and through which channel the invoice is expected.

What has already happened and what is yet to come?

Peppol BIS Billing version 3.0.21 was released on 20.05.2026 and is mandatory from 17.08.2026. The validation rules and code lists have changed, but this is the work of your operator or software, not yours. If you send invoices via the direct interface, ask your supplier for confirmation that the version has been updated.

The next big sign is cross-border: Council Directive (EU) 2025/516 establishes a procedure for e-invoicing and digital reporting for intra-EU transactions from 01.07.2030.

There is no general B2B e-invoicing obligation in Estonian law. The „buyer chooses“ principle applies and the company’s own decision to register is up to them. If someone sells you a solution under the pretext of an „immediately effective obligation“, ask for the section.

Read also: English

Last checked: September 14, 2026

FAQ

Is the use of PEPPOL mandatory when submitting invoices to Estonian government agencies?

No, PEPPOL itself is not a direct legal requirement, but a technical delivery channel. According to the Accounting Act, the public sector must be provided with a machine-readable e-invoice that complies with the EN 16931 standard or the Estonian standard.

Can I send an invoice to a government agency as a PDF file by email?

By default, it is not allowed, because public sector institutions expect a machine-readable file and are registered as recipients of e-invoices. Sending a PDF invoice is legally permitted only if the buyer has made an exception and the parties have clearly agreed to it.

Does the monetary amount of the invoice affect the requirement to submit an e-invoice?

No, there are no minimum transaction amounts or procurement limits in the law. You need to check the buyer's status in the e-business register, not the invoice amount, because the rule applies equally to invoices of any size.