Poland’s 2026 tax landscape focuses on digital compliance, with mandatory e‑invoicing via the National e‑Invoicing System (KSeF) and new corporate income tax reporting in JPK_CIT format. The year also sees expanded withholding tax exemptions for foreign investment funds and a temporary 30% corporate tax rate for banks.

Croatia’s new Fiscalization Act will require all VAT‑registered businesses to issue electronic invoices for domestic B2B transactions from 1 January 2026, using EN 16931‑1:2017 standards and real‑time transmission to the tax authority. Paper invoices will only be allowed in exceptional cases, and non‑VAT‑registered businesses must accept and issue e‑invoices by 1 January 2027. Penalties apply for non‑compliance.

The EU has updated its eInvoicing standard EN 16931, adding B2B extensions, new technical specifications, and a semantic data model. The ViDA initiative now requires near real‑time VAT reporting for intra‑EU transactions, with a new Digital Reporting Requirements (DRR) message that is a VAT report, not an invoice. Businesses aligning early will avoid compliance issues and benefit from streamlined invoicing and reporting.