Estonia's Phased Path to Mandatory B2B E-Invoicing

While most EU e-invoicing coverage this year has focused on France, Belgium, and Poland, Estonia has been quietly building its own B2B mandate — through an unusual two-step, buyer-driven model rather than a single hard deadline.

Under amendments to Estonia's Accounting Act, from 1 July 2025 any entity registered as an e-invoice recipient in the Estonian Commercial Register (Äriregister) gained the right to require its suppliers to issue structured, EN 16931-compliant e-invoices instead of PDFs or paper. Once a buyer has registered this preference, the supplier — whether Estonian or a foreign business invoicing an Estonian counterparty — must comply. This mechanism applies to both B2B and B2G transactions and works alongside, rather than replacing, Estonia's existing voluntary e-invoicing infrastructure.

Suppliers are not obligated to issue e-invoices to every customer by default — only once a registered buyer has exercised the right to request them. In practice, this has pushed adoption gradually upward as larger buyers (public bodies and big private-sector purchasers) register and start requiring structured invoices from their supply chains.

Estonia accepts both the Peppol BIS 3.0 format and its own established local e-invoice XML schema, both aligned with the EN 16931 European semantic standard. Businesses already issuing Peppol invoices for trade with other EU countries do not need a separate Estonia-specific integration.

The Estonian government has signalled it intends to move from this opt-in, buyer-triggered model to a general, universal B2B e-invoicing mandate covering all VAT-registered businesses by 2027 — removing the option to send paper or unstructured PDF invoices in domestic B2B trade entirely. As of September 2026, this remains a stated policy direction rather than a finalized law with a locked commencement date, so businesses should treat 2027 as a planning horizon rather than a confirmed deadline until further legislation is published.

If you invoice Estonian companies or public bodies — even without an Estonian establishment — check whether your counterparty has registered as an e-invoice recipient. If they have, you are already obligated to send them structured e-invoices today, not in some future year. This buyer-driven mechanism means the practical mandate can arrive for a given trading relationship well before the general 2027 target.

1. Check the e-Invoice Register status of your Estonian counterparties before assuming PDF invoices remain acceptable.
2. If you already generate Peppol BIS 3.0 invoices for other EU markets, extending that capability to Estonian trading partners is largely a configuration exercise, not a new build.
3. Track the 2027 general mandate's progress rather than treating it as confirmed — Estonia has moved incrementally so far, and the final scope and date could still shift.

European Commission, eInvoicing in Estonia; Sovos, Estonia: Mandatory B2B E-invoicing Upon Buyer's Request Approved.