Earning money across borders creates tax obligations in multiple countries—and getting it wrong can cost thousands in penalties or missed deductions. Whether you're a US expat working abroad, a foreign national earning US income, or a business owner navigating global revenue streams, the stakes are high. Understanding what questions to ask your tax advisor now can save you from costly mistakes down the road.
The Core Complexity: Which Country Taxes Your Income?
Your income doesn't just get taxed by one country. The US taxes its citizens on worldwide income regardless of where they live, while most other countries tax based on residency status. This creates overlap—you might owe tax in two or three jurisdictions simultaneously on the same dollars earned.
Your advisor needs to determine your tax residency status in each country where you earned income. This involves more than just where you physically live; it considers factors like the permanent home test, center of vital interests, and duration of stay. A common mistake is assuming tax residency follows the same timeline as physical relocation—it doesn't. You could still be a tax resident in your home country for one or two years after leaving.
Key Questions to Ask Before Hiring an Advisor
Do they specialize in your specific situation? Not all tax professionals understand expat taxation. Look for someone with credentials like Enrolled Agent (EA), CPA, or membership in the American Expat Center or International Tax Association. Ask directly: Have you handled cases for people in my exact situation—working in [specific country], holding [citizenship], with [type of income]? Get examples.
Can they coordinate across multiple tax systems? If you owe taxes in two countries, your advisor needs to file returns in both and manage tax treaty provisions to avoid double-taxation. This requires knowledge of that specific country's rules. Someone who handles US taxes only won't suffice if you also need a UK return or German filing.
What are their fees and timelines? Expat tax returns are more complex than domestic returns. Expect to pay $2,500–$8,000+ for a comprehensive international return from a qualified specialist, depending on income complexity and number of countries involved. Some advisors charge hourly ($150–$400/hour), while others use flat fees. Ask for a written estimate before you commit.
Do they understand specific tax credits and exclusions? The Foreign Earned Income Exclusion (FEIE) lets US citizens exclude roughly $120,000 of foreign-earned income (2023; adjusted annually), but only if certain tests are met. The Foreign Tax Credit (FTC) lets you credit taxes paid abroad. These tools save money significantly—but only if your advisor knows which one applies to you and calculates it correctly. A poor calculation here can cost tens of thousands.
Red Flags in Advisor Selection
Avoid advisors who:
- Promise you'll "pay no tax" with little analysis of your situation
- Haven't filed an expat return in the last two years
- Can't explain the Foreign Earned Income Exclusion or Foreign Tax Credit clearly
- Charge flat fees without understanding the complexity of your income streams
- Don't ask detailed questions about where income was earned, your residency timeline, or your current citizenship status
Finding and Comparing Advisors
Start by identifying what countries' tax returns you actually need filed. Then search for specialists in those specific jurisdictions. Professional bodies like the American Institute of CPAs, the Enrolled Agents Association, and country-specific tax institutes (like ICAEW for the UK or Steuerberaterverbände for Germany) publish member directories.
Interview at least two advisors before deciding. Ask each the same questions so you can compare answers directly. Watch for vague responses—expat tax is technical enough that confident professionals can explain it clearly.
Platforms like Mercoly help you compare and find trusted International & Expat Tax providers in one place, making it easier to vet multiple specialists against your specific needs without spending hours on research.
Frequently Asked Questions
Q: Do I need to file taxes in my current country if I'm a US citizen? Yes, the US taxes citizens on worldwide income regardless of residency, and you likely also owe taxes in your current country of residence based on local residency rules. You'll typically file in both jurisdictions, using foreign tax credits to avoid double-taxation.
Q: What's the difference between the Foreign Earned Income Exclusion and the Foreign Tax Credit? The FEIE lets you exclude earned income from US taxation if you meet residency tests (typically the Physical Presence Test or Bona Fide Residence Test), while the FTC lets you credit foreign taxes paid dollar-for-dollar against US tax owed. Your situation determines which benefits you.
Q: How much should I expect to pay for an expat tax return? Expect $2,500–$8,000+ from a qualified specialist, depending on income sources, number of countries involved, and complexity. Always get a written estimate upfront.
Find a specialized International & Expat Tax advisor matched to your situation today—don't gamble with cross-border tax compliance.