by Dr. William Sen
For many years, German citizens often delayed US naturalization because German law could treat voluntary naturalization as a loss of German citizenship unless a Beibehaltungsgenehmigung had been granted beforehand.
That hurdle is largely gone. I talked about that in my last blog post: What German Citizens in California Need to Know About US Citizenship
US citizenship is not just a stronger immigration status. It is a different legal category with a different bundle of rights.
Key benefits that often matter in California life planning include:
Political uncertainty refers to a very concrete legal distinction: permanent residency is an immigration status granted under statutory and regulatory frameworks that can be changed, interpreted, or administratively slowed. Citizenship, by contrast, is a constitutional status.
A green card is called “permanent,” but it is not unconditional. It must be renewed periodically (the physical card typically every 10 years), and permanent residents remain subject to immigration law. Their status can be questioned in removal proceedings under certain circumstances, such as prolonged absence from the United States, specific criminal convictions, or findings of abandonment.
US citizenship operates on an entirely different legal level. A US citizen has an absolute right to reside in the United States. That right is not dependent on visa categories, renewal cycles, or discretionary immigration processing. A US Citizen cannot be deported.
Immigration policy can shift with new administrations, new legislation, or court rulings. Processing rules, enforcement priorities, and procedural interpretations can change. It is a fact that non-citizens remain within the immigration system, and citizens do not.
For example, administrative backlogs or procedural changes can affect how quickly applications or renewals are processed. Court decisions can temporarily pause certain immigration programs or reinterpret eligibility standards. Legislative amendments can adjust grounds of removability or admissibility. All of these dynamics apply to non-citizens, including permanent residents.
Citizenship removes that layer of uncertainty. Once naturalized, your right to live in the United States is no longer contingent on immigration administration. It is grounded in constitutional protection rather than immigration permission.
For German citizens living long-term in San Diego or elsewhere in California, this distinction is often central to the decision. Permanent residency can be stable for decades. However, it remains an immigration benefit.
Choosing to naturalize is therefore not only about voting rights or a US passport. It is about converting a revocable immigration status into a fundamentally protected legal status in the United States.
US citizenship also brings real obligations. The most important ones to understand before applying are taxes, legal duties, and practical travel rules:
The United States taxes US citizens on worldwide income, even when living abroad. That includes the obligation to file US tax returns based on US rules, with potential relief mechanisms like foreign tax credits or exclusions depending on the situation.
For many German citizens, this is the single biggest long-term tradeoff of becoming a US citizen, especially if there is a realistic chance of moving back to Germany or holding significant assets and accounts outside the US.
This is where many German citizens want clarity: Does US citizenship create new duties in Germany, or change existing ones?
German taxation is primarily residence-based, not citizenship-based: Germany generally taxes based on residence or habitual abode (unlimited tax liability), not simply because a person holds German citizenship. If there is no residence or habitual abode in Germany, German tax obligations typically depend on Germany-source income and specific rules.
So the major shift in worldwide taxation is on the US side after naturalization, not on the German side merely because of dual citizenship.
Voting as a German citizen abroad: German citizens living abroad are not automatically on an electoral register. Voting typically requires applying to be entered in the electoral register for the relevant election. US citizenship does not remove German voting eligibility as long as German citizenship remains.
Military service context: Germany suspended compulsory military service in 2011 (suspended is not the same as abolished). Discussions and legislative steps around service models can evolve. If this topic is relevant to your household, check current rules at the time you make decisions, especially for younger family members.
Practical dual-national travel reality: As a dual national, US rules generally expect use of a US passport to enter and leave the US, while Germany may expect use of a German passport to enter and leave Germany. This is a practical planning point for travel, not a penalty.
Us Citizenship vs. German Citizen With a Green Card in California
Both statuses are strong, but they are not equivalent.
Green Card Strengths
Permanent residency allows living and working in the US long-term and can be a stable foundation for life in San Diego.
Key differences where US citizenship is meaningfully stronger
Political Rights
Voting and full civic participation: only citizens can vote in federal elections.
Passport and Entry Rules
US citizens can get a US passport and generally must use it to enter/leave the US.
Worldwide Taxation Difference
Green card holders can also face US worldwide taxation while they remain US tax residents under US rules, but citizenship-based taxation is uniquely durable: it can continue even after moving abroad, and ending it can be complex. This is why tax planning is essential before naturalizing.