Can I buy an Austrian vignette today and drive today?
A 1-day or 10-day vignette can start the same day you buy it. A 2-month or annual one cannot: Austrian consumer law gives you a right of withdrawal on an online purchase, and the earliest either can become valid is the 18th day after you buy it (ASFINAG, checked 19 August 2026). If you are leaving sooner than that, take the 10-day.