Parliament approved mandatory B2B e-invoicing and digital bookkeeping in June 2026 (Lovvedtak 52 (2025-2026), based on Prop. 44 L (2025-2026)), with Royal Assent pending before the bill becomes statutory law. The mandate applies to all entities with bookkeeping obligations, including foreign companies registered locally, and is rolled out in two phases. From 2027-01-01, these businesses must issue e-invoices to buyers registered in the national Electronic Recipient Register (ELMA, integrated into the Peppol directory). From 2030-01-01, businesses must also be able to receive e-invoices and keep accounts in a qualifying digital bookkeeping system with automated invoice booking. The obligation is asymmetric: a vendor must start issuing e-invoices once the buyer registers in ELMA, but buyers are not obliged to receive them before 2030-01-01, so the move away from paper and PDF invoices happens progressively between 2027 and 2030. The primary legislation is technology-neutral and requires only a structured, standardised, machine-readable electronic format; the Directorate of Taxes (Skattedirektoratet) has indicated the EHF (Elektronisk Handelsformat) format and will confirm it in secondary regulations (forskrift) due by 2026-12-15. The legal definition of an electronic invoice is aligned with the EU VAT in the Digital Age (ViDA) framework, and electronic invoices must be retained in their original format. The obligation does not cover sales to consumers or cash sales. Micro-businesses below 50,000 NOK turnover (~4,500 EUR), and entities in specific sectors such as bankruptcy estates, financial enterprises, banks, insurance companies and pension funds, are expected to be exempt. eSignature not required.