Expat Tax Residency in Austria

Austria's rules on expat tax residency are precise, consequential, and anchored in two federal statutes: the Einkommensteuergesetz 1988 (EStG) and the Bundesabgabenordnung (BAO). An individual who crosses either of Austria's two residency thresholds becomes unlimitedly tax-liable — meaning Austrian income tax applies to all worldwide income, from every country. Understanding where those thresholds sit, how the Zweitwohnsitzverordnung can contain exposure, and what relief the Zuzugsbeguenstigung offers is essential for anyone arriving in Austria or retaining property there.

For country-level context on Austria's broader tax landscape, see the Austria country overview.

When does a Wohnsitz (domicile) in Austria trigger unlimited tax liability?

Under section 1(2) EStG, unlimited tax liability arises the moment an individual holds a Wohnsitz in Austria. The Wohnsitz concept is defined in section 26(1) BAO: a dwelling that an individual retains and uses under circumstances indicating ongoing use — for example, a furnished flat kept available year-round — constitutes a Wohnsitz even if the individual spends only short periods there. The Verwaltungsgerichtshof (Austria's supreme administrative court) has confirmed that a key-in-lock, furnished apartment qualifies; an unfurnished shell does not. Critically, official registration at the Zentrales Melderegister (Meldezettel) is not required for Wohnsitz to exist — the factual situation governs. A second or holiday property retained in Austria can therefore create unlimited liability on worldwide income even where the individual primarily lives abroad. Liability arises from the first day the Wohnsitz exists, with no minimum stay required [BMF income-tax-liability guidance, citation 1].

How does the 6-month rule (gewoehnlicher Aufenthalt) work?

Where no Wohnsitz is present, Austria's second trigger applies: section 26(2) BAO creates a gewoehnlicher Aufenthalt (habitual abode) once an individual's cumulative physical presence in Austria exceeds six months. The Bundesabgabenordnung states that after a stay in Austria of six months, unlimited tax liability applies in all cases — and retroactively from the first day of that stay. The six-month count runs across calendar-year boundaries when the stay is continuous, so an individual who arrives on 1 October and does not depart before 1 April will be retroactively fully liable from day one [USP income-tax-liability page, citation 2]. Short business visits or holidays that do not aggregate to six months do not create habitual abode, though the qualifying days are cumulative across the calendar year.

What are the 2025 progressive income tax rates on worldwide income?

Once an individual is unlimitedly tax-liable, Austrian Einkommensteuer applies to all worldwide income at the following 2025 brackets (inflation-adjusted under the cold-progression mechanism introduced in 2023):

The 55 percent top rate on income above 1,000,000 EUR applies for the years 2016 through 2025 inclusive. From 2023, thresholds are adjusted annually by at least two-thirds of the prior-year inflation rate to counteract bracket creep. Foreign income is generally taxed under the exemption-with-progression method: income exempt in Austria under a double-tax treaty is still factored into the calculation of the Austrian rate that applies to Austrian-source income [USP tariff levels page, citation 3].

What is the Zuzugsbeguenstigung and who qualifies?

Austria's primary inbound-mobility relief is the Zuzugsbeguenstigung under section 103 EStG 1988. The provision allows the Finanzamt Oesterreich to grant incoming scientists, researchers, artists, and athletes a discretionary exemption from the additional Austrian tax burden that arises when foreign income becomes subject to Austrian tax for the first time. For scientists and researchers specifically, section 103(1a) EStG grants a Zuzugsfreibetrag of 30 percent of income from both domestic and foreign scientific activities for up to five years from the date of relocation [BMF Zuzugsbeguenstigung page, citation 4]. The 30 percent deduction reduces the Austrian taxable base directly; when granted via payroll, the employer applies it to monthly wage-tax withholding. Artists and athletes can apply for the general tax-burden equalisation under section 103(1) EStG, which eliminates the excess Austrian tax compared to the individual's prior-jurisdiction rate, rather than the flat 30 percent deduction.

Key eligibility conditions for the section 103(1a) relief: the individual must shift their centre of vital interests (Lebensmittelpunkt) to Austria; the previous centre of vital interests must not have been in Austria during the preceding five calendar years (a stricter 10-year bar applies for the general section 103(1) relief); and the scientific or research work must be carried out at an Austrian university or recognised research institution and must be of public interest to Austria. Applications must be submitted in German using Form E103 to the Finanzamt Oesterreich within six months of relocating. The BMF assesses applications on a case-by-case basis and retains full discretion to refuse even where documentary criteria appear satisfied. Approval typically takes three to six months. Once granted, the Bescheid (administrative decision) specifies the benefit percentage and the five-year maximum period.

How does the Zweitwohnsitzverordnung limit liability for a holiday home?

For individuals whose centre of vital interests has been located outside Austria for more than five consecutive calendar years, the Zweitwohnsitzverordnung (BGBl. II Nr. 528/2003) creates a safe harbour: a domestic dwelling constitutes a taxable Wohnsitz only in those years in which it is used for more than 70 days, counting all Austrian properties together [Zweitwohnsitzverordnung BGBl. II 528/2003, citation 5]. Where annual use remains at or below 70 days, the property is treated as a secondary residence (Zweitwohnsitz) and does not trigger unlimited tax liability in that year. Two additional requirements must be met concurrently: (a) the individual must maintain a written usage log showing the actual days of Austrian property use during each calendar year; and (b) there must be no Austrian-resident spouse or registered partner who is unlimitedly tax-liable and from whom the individual is not permanently separated. Failure to keep the log disqualifies the safe harbour retroactively for that year. The 70-day threshold applies to the total of all Austrian properties combined, not each property individually.

How does the residence tie-breaker under double-tax treaties apply?

Where an individual satisfies both Austria's domestic Wohnsitz or habitual-abode test and the residency test of another country, dual residency arises. Austria's network of more than 90 Doppelbesteuerungsabkommen (double-tax treaties) resolves this via the OECD Model Convention Article 4(2) tie-breaker: the treaty assigns exclusive residence to one state by examining, in order, (1) where the individual has a permanent home available, (2) where the centre of vital interests (personal and economic ties) is located, (3) where the individual habitually resides, and (4) nationality, with a mutual-agreement procedure as the final fallback [Grant Thornton Austria tax-residency blog, citation 6]. Treaty residence overrides the domestic EStG test for treaty-covered income: where the treaty assigns residence to the other state, Austria treats the individual as beschraenkt steuerpflichtig (limited tax liability) on Austrian-source income only under section 1(3) EStG. This does not eliminate Austrian wage-tax withholding on Austrian-source employment income, but the individual can claim a refund via Form ZS-QU2 where withholding exceeds treaty entitlement.

How do registration and the tax number work for new arrivals?

Every person residing in Austria must register their address at the local Meldebehörde (registration authority) within three days of taking up residence, using the Meldezettel form [oesterreich.gv.at registration guidance, citation 7]. The Meldezettel requires the signature of the landlord or property owner, proof of accommodation, and a valid identity document. Registration is recorded in the Zentrales Melderegister. For tax purposes, registration feeds into the Wohnsitz evidence base but does not by itself create or end unlimited tax liability — the factual test under section 26 BAO is determinative.

The Austrian tax identification number (Steuernummer, format 99-999/9999) is issued automatically by the Finanzamt upon initial registration or, for individuals with Austrian-source income not yet registered, on application to the local Finanzamt. It can also be accessed via FinanzOnline (finanzonline.bmf.gv.at), the digital portal through which income-tax returns (Steuererklarung) are filed. Annual income-tax returns are due by 30 April of the following year when filed on paper, or by 30 June when filed electronically via FinanzOnline; advisers may obtain an extended deadline.

Given the breadth of Austria's worldwide taxation, the discretionary nature of Zuzugsbeguenstigung applications, and the precision required to maintain Zweitwohnsitzverordnung eligibility, individuals relocating to or from Austria benefit from engaging a qualified Steuerberater (chartered tax professional under the Wirtschaftstreuhandberufsgesetz). A registered practitioner in this jurisdiction can be found through TaxPros Rated's Austrian directory.