For Americans, the complication starts before you even arrive. US citizenship is permanent and portable—you owe US income tax on worldwide earnings no matter where you live or work. If you're a US citizen or green card holder earning money while physically in Spain, that income is taxable to the US, period. This applies whether you're self-employed, working for a US company, or contracting with US clients. The Foreign Earned Income Exclusion (FEIE) can shelter up to $120,000 of foreign earned income from US federal tax in 2023 (adjusted annually for inflation), but you must qualify: you need either a tax home in a foreign country and physical presence outside the US for 330 days in a 12-month period, or bona fide residency in a foreign country for an uninterrupted tax year. Spain's digital nomad visa alone doesn't establish either. You could be on the visa for only six months and still owe US tax on all your income. The FEIE is powerful, but it requires planning.
Beyond income tax, US citizens abroad must file FBAR (Foreign Bank Account Report) if they have foreign financial accounts totaling more than $10,000 at any point in a calendar year. Spain is in the EU, and opening a Spanish bank account is routine—but that account triggers FBAR filing. The form is free and filed with FinCEN, not the IRS, but it's mandatory. Failure to file carries penalties starting at $10,000 per violation. You also file FATCA (Foreign Account Tax Compliance Act) forms if you have certain foreign financial assets. These are separate from your regular 1040 tax return. Many Americans working abroad don't know about FBAR until an accountant tells them, and by then they're years behind.
Your US employer may also have restrictions you haven't considered. Large US companies often have policies prohibiting employees from working outside the US without explicit written approval, even if the employee is salaried and working remotely. The policy exists partly for tax and compliance reasons, partly for data security, and partly because some employers haven't updated their rules for a distributed workforce. You need to ask your HR department directly: "Can I work from Spain for an extended period?" Get the answer in writing. If your employer says no, working from Spain anyway puts your job at risk and potentially violates your employment agreement. If your employer says yes, ask whether they'll handle any tax withholding adjustments or if you're responsible for all tax filings yourself. Some large employers have international payroll teams that can manage this; others will tell you it's your problem.
If you're self-employed or contracting with US clients, the employer-approval issue disappears, but the tax filing burden increases. You'll owe US self-employment tax (15.3% on net earnings) in addition to income tax, though the FEIE can reduce your income-tax liability. You'll also need to register with Spanish tax authorities as a non-resident earning Spanish-source income. Spain taxes non-residents on income derived from Spanish sources at a flat 24%, but if your income is from outside Spain (US clients, for example), you may not owe Spanish tax on it. This is where the rules get murky and where a cross-border tax professional becomes essential, not optional. The cost of a good accountant—typically $1,500 to $3,000 for a US expat's first year—is cheaper than an audit or penalty.
Green card holders face the same US tax obligations as citizens, with one additional wrinkle: if you spend more than 183 days outside the US in a calendar year, you may trigger "expatriate" status under US tax law, which can affect your tax filing requirements. The rule is complex and depends on your specific situation, but it's another reason to consult a tax professional before you go.
Non-US citizens have almost none of these complications. If you're a Canadian, British, German, or Australian citizen, Spain's digital nomad visa is a clean win. You register with Spanish tax authorities, pay Spanish taxes on Spanish-source income, and you're done. Your home country may tax you on worldwide income too, but most countries have tax treaties with Spain that prevent double taxation. The visa is designed for you.
The practical sequence for an American considering Spain's digital nomad visa is this: First, confirm with your employer (if you have one) that working from Spain is permitted. Second, consult a cross-border tax professional—not a general accountant, but someone who specializes in US expat taxation. Third, apply for the visa through your nearest Spanish consulate. Fourth, before you move, set up a system for FBAR and FATCA filing. Fifth, once in Spain, register with the Spanish tax authority (Agencia Tributaria) within 30 days of arrival. You don't need a Spanish work permit if you're remote, but you do need a tax registration number (NIF). Sixth, file your US taxes on time every year, even if you owe nothing after the FEIE.
The visa itself is real and works. The problem is that it exists in a gap between two tax systems, and Americans have to do the work to bridge that gap. For non-Americans, it's one of the easiest paths to a year in Spain.
