When non-residents may still need to file
German tax residency is not the only thing that matters. Even if you live abroad and are not treated as a German tax resident, Germany can still tax certain income that arises from German sources.
This is especially important for Americans and other expats who assume that living outside Germany automatically means they have no German filing requirement. In many cases, that assumption is wrong.
Common examples of German-source income
Some of the most common examples of German-source income for non-residents include:
- Rental income from property located in Germany.
- Salary linked to work physically performed in Germany.
- Income connected to a German employer where part of the work is actually carried out inside Germany.
If you own a property in Germany and rent it out while living abroad, Germany can tax that rental income and may require a German tax return reporting that income.
Working in Germany for a German employer
Employment income can also create a German tax filing obligation, even if you live in another country most of the time. In the webinar example, the speaker explained that if you live abroad but work for a German company and perform some of that work in Germany, Germany can tax the portion of salary linked to the days worked physically in Germany.
That means the location where the work is actually performed matters. It is not only about where your employer is based or where your salary is paid.
Even one day can matter
This is the part many people miss: the filing obligation can start surprisingly early. According to the webinar example, if you live abroad, work remotely for a German company, and are in Germany for just one working day, Germany may tax the salary portion for that one day and require a German tax return for it.
That does not mean every one-day visit automatically becomes a major tax case, but it does show how quickly non-resident German tax exposure can arise.
Why this catches people off guard
Many cross-border workers think only full relocation creates German tax issues. In reality, a property in Germany, a few workdays in Germany, or other German-connected income can be enough to trigger filing obligations even when you remain non-resident.
This is particularly relevant for:
- Americans living elsewhere in Europe
- Remote workers employed by German companies
- People with German rental property
- Employees who travel into Germany for meetings, projects or short assignments
Why professional advice often helps
Once German-source income is involved, the next question is usually not just whether Germany can tax the income, but how much of it Germany can tax and whether a tax treaty changes the result. In practice, that often requires looking at the type of income, where the work was physically done, and whether any relief is available in your country of residence.
For that reason, non-residents with German-source income often need a German tax advisor even if they do not live in Germany full time.