How to Send an E-Invoice to a Finnish Customer from Estonia

An e-invoice travels from Estonia to a Finnish customer with three things: the customer’s verkkolasku address (Finland’s e-invoicing address), the name of their operator, and a provider on your side that supports the Finland route. The Finnish e-invoicing address is usually an OVT code: built from the tax administration prefix 0037, the company’s business ID (Y-tunnus) and up to five extra characters – or an IBAN-based address. Any Finnish recipient’s address and operator can be verified in TIEKE’s public registry at verkkolaskuosoite.fi. You do not need a separate contract with a Finnish operator: Estonian operators maintain bridges to their Finnish counterparts, and the invoice moves through the operator cooperation network or Peppol.

Step by step: your first e-invoice to Finland

1. Ask the customer for their verkkolasku address and operator (Finnish companies print these on invoices and websites) or look them up in the TIEKE registry.
2. Confirm with your operator or software that the Finland route is supported: either a direct Finvoice bridge or via Peppol.
3. Enter the customer’s OVT code and operator ID exactly as the registry shows them – most delivery failures are address typos.
4. Send, and for the first invoice verify with the customer that it landed in their system with correct data.

Finvoice or Peppol: which route?

Finland’s local format is Finvoice and the domestic network runs between operators; at the same time many Finnish operators also support the Peppol network. In practice your customer’s channel decides: if their operator is on Peppol, Peppol is the simplest common path; if not, your operator’s Finvoice bridge handles the conversion. On either route it helps that your invoice complies with EN 16931 – Estonia’s primary e-invoice format since 1 July 2025, and the same standard Finland’s act 241/2019 refers to.

Can a Finnish customer demand an e-invoice?

Yes. Finland’s act 241/2019 gives contracting entities and businesses the right to receive, on request, an e-invoice conforming to the European standard. If your Finnish customer exercises that right, a PDF will not do, because the act refers to an e-invoice conforming to the European standard – similar to Estonia’s own buyer’s right. An exporter has two solid reasons to set the Finland route up properly: invoices arrive faster, and a formal demand will not catch you unprepared.