When Austria treats you as a tax resident

Americans moving to Austria usually focus on US filing rules, which do not change when you move. The bigger shift is on the Austrian side: at some point Austria starts treating you as its taxpayer, and from then on it can tax income from anywhere in the world, including US income. Knowing when that happens, and how the US-Austria treaty sorts out conflicts, shapes everything from when you move to how you handle a US pension or a remote job. This guide is based on the Austrian Ministry of Finance's English Tax Book, the Austrian business service portal and the treaty text.

Two kinds of tax liability

Austrian income tax law distinguishes between unlimited and limited liability. The business service portal (USP) explains that nationality is only a factor in exceptional cases. What matters is where you live.

### Unlimited liability

According to the Tax Book, people have unlimited tax liability if their place of residence or regular domicile is in Austria. Unlimited liability means that all domestic and foreign earnings are taxable in Austria.

• Place of residence. You have one if you have a home in Austria at your disposal that you obviously use, or will use, on a longer-term basis. It need not be your main home, and you need not live there permanently; recurrent use is enough. A rented apartment you keep and return to can qualify.
• Regular domicile (habitual abode). You have one if you stay in Austria not just temporarily, for a holiday, a business trip or a visit, but obviously for a longer period.

### The six-month rule

The Tax Book is explicit: in any event, people have unlimited tax liability after they have stayed in Austria for six months, with retroactive effect. If you stay longer than six months, Austria treats you as fully liable back to the first day.

For employees, the rule can start even earlier. The Tax Book says foreign employees are treated as subject to unlimited tax liability from the first day of their stay if they have a work permit for at least six months or an employment contract for at least six months. So an American moving to Vienna on a two-year contract is an Austrian taxpayer from day one.

### Limited liability

Limited liability applies to people who are not resident and do not have their habitual abode in Austria but earn income in Austria, for example as employees, or from Austria, such as social security pensions. They are taxed only on that Austrian income.

The Tax Book warns that for people with limited liability, €10,888 is added to the tax base when assessed. The reason is that the tax-free subsistence minimum is normally granted by the country of residence; with a zero-rate band of €13,308, limited taxpayers keep a tax-free basic income of only €2,421.

Dual residence and the treaty

An American who moves to Austria may still be resident in the US for treaty purposes, and the US taxes citizens anyway. The US-Austria treaty, Article 4, defines who is a resident of each country and settles conflicts for individuals resident in both. The tie-breaker steps are:

1. Permanent home. You are resident where you have a permanent home available.
2. Center of vital interests. If you have a permanent home in both countries or neither, you are resident where your personal and economic relations are closer.
3. Habitual abode. If that cannot be determined, where you have a habitual abode.
4. Nationality. If you have a habitual abode in both or neither, the country of which you are a national.
5. Mutual agreement. If none of these settles it, the two tax authorities try to agree.

The Tax Book describes the same idea from the Austrian side: if you have a residence in both states, residency depends on where your center of vital interests lies, considering mainly your personal and economic circumstances.

Article 4 also has a rule specific to Americans: a US citizen or green card holder who is not an Austrian resident counts as a US resident for treaty purposes only if they have a substantial presence, permanent home or habitual abode in the US.

### The saving clause still applies

Whatever the tie-breaker says, Article 1 of the treaty lets the US tax its citizens as if the treaty did not exist, with listed exceptions. Treaty residence decides which country gives way, mainly through credits, but it does not end your US filing.

Reporting foreign income in Austria

Once you are an Austrian tax resident, the Tax Book states that as a rule Austria has the right to tax your global income, subject to the double tax convention with the source country. The treaty decides which country may tax each item.

Where Austria has the right to tax foreign income, you report it on Form L 1i, and possibly Form L 17. If the foreign country also has a taxing right, Austria applies either the exemption method or the credit method. Exempt income can still raise the rate on your other income under the progression rule.

### Mandatory assessments

The Tax Book lists situations in which an unlimited taxpayer must file an assessment with supplement L 1i, including income:

• from a foreign employer not obliged to withhold Austrian wage tax;
• from a foreign pension;
• from third parties without wage tax deduction;
• also taxed abroad where the treaty prescribes the credit method;
• exempt in Austria but subject to the progression proviso.

This catches many Americans: a remote job with a US employer, a US company pension or an IRA distribution can all trigger a mandatory Austrian assessment.

Pensions and Social Security

The treaty's Article 18 gives each country specific rights over pensions. Social security and other public pensions paid by one country to a resident of the other, or to a US citizen, are taxable only in the paying country. That means US Social Security received by an American living in Austria is taxable only in the US. Private pensions for past employment are generally taxable only in the country of residence.

The US side of residence

For US purposes, moving abroad matters mainly for two tests. The IRS foreign earned income exclusion requires either bona fide residence abroad for an uninterrupted period that includes an entire tax year, or physical presence abroad for 330 full days in 12 consecutive months. The automatic two-month extension to June 15 is available to citizens whose tax home and abode are outside the US on the regular due date.

Practical points

1. Treat your arrival date as the possible start of Austrian liability, especially with a contract of six months or more.
2. Keep a record of days in Austria and days abroad for both countries' tests.
3. Identify every foreign income source and check whether it triggers form L 1i.
4. Keep proof of where your permanent home is if you keep a US house.
5. Coordinate Austrian assessments with your US return for foreign tax credits.

Common questions

When do I become an Austrian tax resident? When you have a residence or habitual abode in Austria, and in any event after six months in the country, retroactively to the first day. Employees with a contract or permit of at least six months are liable from day one.

Does Austria tax my US income? Once you have unlimited liability, all your domestic and foreign income is taxable in Austria, subject to the US-Austria treaty.

Is my US Social Security taxed in Austria? Under Article 18 of the treaty, US social security paid to a resident of Austria or a US citizen is taxable only in the United States.

What form reports foreign income in Austria? Form L 1i, together with the employee tax assessment, and possibly Form L 17.