Taxation in the Federal Republic
US citizens living in Germany are subject to taxation on their worldwide income by the US, while also being taxed by Germany as residents. This dual liability is largely mitigated by the US-Germany Tax Treaty, which allows for the use of the Foreign Tax Credit (FTC) to prevent double payment. Review the German Federal Ministry of Finance treaty provisions to understand how your income is sourced.
FATCA and FBAR in Germany
German banks report account data to the IRS under FATCA. You must report accounts exceeding $10,000 to the Treasury via FinCEN Form 114 to avoid penalties that can reach $10,000 per violation.
Navigating the German 'Abgeltungsteuer' and US Tax
Germany’s flat-rate withholding tax (Abgeltungsteuer) on investments (25% plus solidarity surcharge) often creates a credit surplus for US expats. However, the calculation of 'taxable basis' differs significantly between the two nations. For example, the German 'Sparer-Pauschbetrag' (tax-free allowance) is not recognized by the IRS. The calculation for German tax liability on a US return involves converting EUR to USD at the IRS Yearly Average Exchange Rate.
The Soli-Surcharge and US Credits
Calculating your total German tax for the FTC: $$Total\\ Tax_{DE} = Capital\\ Gain \\times (0.25 + (0.25 \\times 0.055))$$. This accounts for the 5.5% Solidarity Surcharge. LSI keywords include 'Steuererklärung,' 'Wohnsitz,' 'Finanzamt reporting,' 'Foreign Earned Income Exclusion,' and 'Article 10 Dividends.' Ensure you check The Federal Central Tax Office (BZSt) for rules on reclaiming withheld taxes. For high earners, the 'Reichensteuer' (rich tax) may apply, necessitating complex treaty-based allocations on Form 1116. Proper documentation of the 'Kirchensteuer' (Church Tax) is also necessary, as it is generally a deductible tax rather than a creditable one.