When I moved to the United States on an E-2 visa, one of my first questions was: how does the tax system actually work here?
The answer is more complex than many people expect—but also more manageable than many fear, provided you understand which decisions and deadlines matter.
This article offers a practical overview. It is not a substitute for advice based on your facts, but it should help you ask better questions.
The U.S. tax system is fundamentally different
For many employees in Germany, wage-tax withholding, statutory social insurance, and annual tax compliance feel comparatively centralized.
The U.S. system places more responsibility on the taxpayer—especially on a self-employed individual or business owner.
No one automatically remits income and self-employment tax on an owner’s pass-through business profit. Depending on the facts, the taxpayer may need to make quarterly estimated tax payments. Underpaying during the year can create a significant balance due and an estimated-tax penalty even when the return itself is filed on time.
Cash-flow planning should therefore include federal and state tax reserves from the beginning.
Federal tax, state tax, and the obligations people overlook
There is no single U.S. tax layer. A taxpayer or business may encounter:
- Federal income tax: a progressive individual income-tax system with rates and thresholds that depend on filing status and the applicable tax year.
- State and local income tax: rules vary significantly. Florida does not impose an individual state income tax, while other states and cities may impose substantial income taxes.
- Self-employment tax: net earnings from self-employment may be subject to Social Security and Medicare tax, subject to the detailed statutory rules and annual limits.
- Payroll tax: an S corporation or C corporation with owner-employees may have payroll, withholding, deposit, and reporting obligations.
- Sales and use tax: the relevant state, customer location, product or service, and economic or physical nexus determine whether registration and collection may be required.
- Business registrations and annual reports: entity compliance is separate from income-tax filing.
Entity classification can affect how income and compensation are taxed, but no structure creates automatic savings. Legal eligibility, reasonable compensation, administrative cost, profit level, and long-term objectives must be evaluated together.
You may be taxable in the United States—but what about Germany?
A frequent question is whether German tax obligations continue after a move.
The answer depends on residence, available housing, days of presence, source of income, business connections, and other facts under each country’s domestic law. The U.S.–Germany income-tax treaty may help assign treaty residence and taxing rights, but treaty application is not automatic.
A treaty may reduce or coordinate double taxation. It does not eliminate every filing or information-reporting requirement.
For example, a U.S. person with German financial accounts may have an FBAR filing obligation when the aggregate maximum value exceeds the applicable threshold. Depending on the facts, Form 8938 or entity-specific international forms may also be required.
Ownership in a German GmbH, partnership, fund, or pension arrangement requires a separate classification and reporting analysis. The German label does not determine the U.S. result.
Common mistakes during a move to the United States
- No estimated tax plan: the taxpayer reaches year-end without adequate payments or reserves.
- Entity formation without tax analysis: an LLC is formed before ownership, classification, payroll, cross-border reporting, and state obligations are evaluated.
- Missed international reporting: foreign accounts, companies, partnerships, funds, gifts, or inheritances are omitted because no additional tax appeared to be due.
- Weak bookkeeping: business and personal activity are mixed, documentation is incomplete, and financial statements cannot support the tax return.
- Health coverage selected in isolation: a policy is chosen without considering household income, Marketplace eligibility, provider network, and the tax return.
Foreign-owned single-member LLCs can face specialized filing obligations when reportable transactions occur. Foreign accounts and certain foreign gifts may trigger separate forms. The precise requirement depends on status, ownership, transactions, values, and the tax year—not merely on nationality or visa type.
What this means for you
The U.S. tax system is not simply a more complicated version of the German system. It is organized differently and expects more forward planning from the taxpayer.
The strongest approach is to build the calendar, entity structure, accounting process, estimated payments, insurance strategy, and international reporting map before the first filing deadline arrives.
A tax return documents events that have already happened. It cannot always recreate elections, compensation decisions, records, or transactions that were never implemented correctly.
The foundation should be built at the beginning—not repaired after several years.
Start the appropriate OAK LEAF fit review if you want to assess your U.S. and cross-border setup.