Regarding government incentives, new CNG cars are subject to a reduced NOVA tax (a one-time Austrian standard tax for new passenger cars which must be paid before registering the vehicle). In addition, a bonus of €500 is offered when purchasing environmental friendly vehicles (deducted from net price before VAT).
Further incentives include reduced tax on CNG (compared to other fuels) of 6.6 eurocents per m³ (no guarantee for a certain period of time given). For CNG stations, a special transportation fee exists for natural gas used as CNG in the Austrian gas grid: 2,400 €/a + 3.6 €cents/ m³.
Source: NGVA Europe