Greece's B2B e-invoicing in 2026 and myDATA: what exporters need to know

A Thessaloniki packaging company invoices a distributor in London. Its accounting software transmits the invoice data to myDATA within seconds and receives a MARK number. A PDF goes to London. The London client pays three weeks later by international transfer into the company's euro account, converted on arrival.

myDATA first

myDATA (my Digital Accounting and Tax Application) is the Independent Authority for Public Revenue's platform for electronic books. Greek businesses transmit summary data for every invoice and expense document, and each document gets a unique MARK registration number. Data can be sent from accounting software, by direct upload, or through a certified e-invoicing provider.

B2B e-invoicing in 2026

Greece then made full B2B e-invoicing mandatory, issued through certified e-invoicing providers:

• 2 February 2026: businesses with gross revenue above €1 million in 2023.
• 1 October 2026: all other businesses.

The providers issue structured invoices, deliver them to Greek buyers and transmit the data to myDATA in one step. Penalties for failure to issue e-invoices were phased in after each start date.

Foreign clients

E-invoicing in the Greek sense applies to domestic B2B transactions. Invoices to clients abroad can go as PDFs or in whatever format the client accepts. Their data still goes to myDATA, with the right document type and income classification for intra-EU or third-country sales. A gap between myDATA and your VAT return is the most common audit trigger.

For most services to EU businesses, the invoice shows no Greek VAT, carries both VAT numbers and refers to the reverse charge. For services to businesses outside the EU, including the UK, it states that Greek VAT does not apply.

Getting paid

EU clients pay a Greek IBAN by SEPA. UK and US clients are slower: they send international transfers that arrive later and, into a euro account, are converted at the bank's rate. Sterling details for UK clients and US details for American clients make their payment domestic and land the invoice amount in full.

Paying into Greece: the local rail

Source: European Payments Council: SEPA Instant Credit Transfer. Checked when this guide was last updated; the scheme's own page has the current figures.

Where Rivet fits

Rivet is not a certified e-invoicing provider and does not transmit to myDATA. A Rivet business account handles foreign collections: US account details in the company's own name on every plan, and euro details with an IBAN plus sterling details from the Growth plan. Payments are matched to invoices and balances can be held or converted at a rate shown before you confirm. Rivet is not a bank; regulated partner institutions hold the funds.