US-Spain tax treaty + mandatory US tax filing abroad
The US-Spain tax treaty aims to prevent double taxation for residents of both countries. US citizens residing abroad are still obligated to file US tax returns annually, regardless of their income source or location. Tools like the Foreign Earned Income Exclusion (FEIE) or Foreign Tax Credit (FTC) can mitigate US tax liability on Spanish-sourced income. Consulting a tax professional specializing in US expat taxation is advised.




