Austria Tax ID & UID Number Guide (ATU Format, Validation, Registration)
Complete guide to Austria's tax identification numbers — UID (ATU format), Abgabenkontonummer, and Firmenbuchnummer. Covers format, ATU regex, VIES validation, registration for foreign businesses, and compliance rules.
Austria VAT guidelines
Austria's VAT guide — the 20% standard rate with 13%/10% reduced rates and the little-known 19% Jungholz/Mittelberg enclave rate, the €55,000 Kleinunternehmer threshold effective 1 January 2025, UID/FinanzOnline registration, the Bauleistungen construction reverse charge, UVA filing cadence, and Austria's B2G-only e-invoicing mandate.