The business environment in the Baltic States is changing. From 2025, Latvia and Estonia will enter the era of mandatory e-invoicing, with Poland joining in 2026. This means businesses can no longer ignore digital invoicing - both between companies and with government authorities. This shift is not just a formality - it’s a strategic step toward more efficient, secure, and transparent accounting.
Why e-invoicing is becoming mandatory?
An e-invoice is not merely a more convenient PDF or paper alternative. It addresses real business challenges:
- Reduces VAT fraud. Authorities receive data in real time, making tax evasion much harder.
- Simplifies business processes. Automated invoice processing reduces manual work, errors, and disputes with partners.
- Promotes cross-border collaboration. The EU-approved PEPPOL standard enables invoices to be sent to any EU country without additional technical barriers.
It is not only a legal requirement—it is an opportunity for businesses to become more modern, efficient, and competitive.
E-invoicing in Latvia, Estonia, and Poland
Latvia. From 2025, invoices for government institutions must be submitted electronically via the e-adrese system. By 2028, e-invoicing will also become mandatory for B2B transactions. This will allow the country to manage data consistently, ensure transparency, and accelerate payments.
Estonia. B2G e-invoicing has been in use for some time, and from July 2025, all companies must issue and accept B2B invoices according to the EN 16931 standard if requested by the transaction partner. By 2027, e-invoicing will be mandatory for all VAT-registered businesses, making paper or PDF invoices unsuitable for official business transactions.
Poland. It is one of the leading EU countries in e-invoicing adoption. The national KSeF system (Krajowy System e-Faktur) is already mandatory for the B2G sector, and from February 1, 2026, it will become mandatory for large companies (annual turnover over 200 million PLN). By April 1, 2026, all remaining businesses will be required to join. KSeF allows companies to send and receive invoices directly through the state infrastructure, ensuring data security, traceability, and real-time VAT reporting to tax authorities.
These changes in neighboring countries are part of the EU strategy to promote transparency, combat fraud, and facilitate cross-border integration.
PEPPOL – a bridge between countries
The PEPPOL (Pan-European Public Procurement On-Line) network enables organizations to securely exchange e-invoices across Europe. One major advantage is that invoices generated in a local format can be automatically converted to the EU standard, making cross-border cooperation easier. This opens up opportunities for Lithuanian companies to collaborate with foreign partners through a unified network.
Furthermore, from 2030, under the ViDA directive, all EU countries engaged in commercial transactions with other member states will be required to use e-invoices.
In Lithuania, since July 2024, SABIS has taken over public sector invoice processing and integrated it into the PEPPOL network. This means companies participating in public procurement will no longer need complex technical integrations for e-invoicing.
What this means for Lithuanian businesses?
If your business has partners in Latvia, Estonia, Poland, or other countries where e-invoicing is or will become mandatory, it is worth acting now:
- Have an e-invoicing solution compatible with the PEPPOL network;
- Adapt accounting systems to meet new standards;
- Ensure data security and traceability.
Companies that prepare in advance will be able to adapt more easily to new automated processes, reduce errors, and integrate e-invoicing into daily operations faster.
Benefits of e-invoicing for businesses
- Faster data processing. Integration with accounting systems automates invoice handling;
- Fewer errors. Structured formats eliminate human mistakes;
- Time and resource savings. No need to manage PDFs or paper documents, which can get lost;
- Better cash flow control. Payment data is available in real time.
E-invoicing is not just a regulatory requirement—it is a competitive advantage. Companies that adopt e-invoicing can comply with the law while making their daily processes more efficient.
How to prepare for the changes?
Unifiedpost solutions help businesses of all sizes transition to e-invoicing smoothly:
- Small and medium-sized businesses. Banqup platform allows sending e-invoices via PEPPOL, SABIS, e-adrese, Estonian networks, and more.
- Large enterprises. Euroconnector and other enterprise solutions automate the entire invoice sending and receiving process via API. Complex solutions also help companies transform invoices to EU standards and integrate them into platforms such as PEPPOL, SABIS, or other desired systems.
It is important to understand that e-invoicing is inevitable—not only required by the EU and local authorities, but increasingly demanded by larger business partners. Preparing for new e-invoicing requirements in advance makes it easier to adapt to changes and avoid additional challenges. Those who prepare today will have an advantage tomorrow.
Is your company ready to send e-invoices to partners in Latvia, Estonia, Poland, and other countries? If not, contact us to learn which solutions are best suited for your business.
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