Hiring an international tax firm means trusting someone with your FBAR filings, GILTI calculations, and residency determinations—so vetting their experience matters more than anywhere else in accounting. A mediocre domestic tax preparer might cost you a few hundred dollars; a mediocre expat tax firm could cost you penalties, audit exposure, or missed treaty benefits worth thousands. Here's how to check references properly and spot the real experts.
Why References Matter for Expat Tax Firms
International tax work sits at the intersection of multiple jurisdictions' rules. A firm claiming expertise in "US expat tax" sounds broad, but there's a massive difference between someone who handles a handful of US citizens living in Canada versus someone managing a portfolio across 30 countries with complex benefits, foreign business ownership, and tax residency questions. References reveal whether the firm has handled your specific situation—not just any cross-border return.
What to Ask for and Who to Contact
Ask the firm for at least three client references with similar profiles to yours. Be specific: if you're a US citizen working remotely from Portugal, ask for references who've lived abroad for 2+ years in European countries. If you own foreign business assets, ask for someone in that category. Generic references from locals with simple expat situations won't tell you much about whether they can handle your complexity.
When contacting references:
- Call, don't email. Phone conversations reveal confidence and depth; written responses are often templated.
- Ask about turnaround time. Typical expat returns take 4–8 weeks if everything's organized; anything longer signals either understaffing or thorough audit-proofing.
- Inquire about problem-solving. Did the firm catch something the previous preparer missed? Did they explain treaty implications without being prompted?
- Confirm the actual fee paid. International tax firms typically charge $2,000–$5,000 for straightforward expat returns and $5,000–$15,000+ for those with business income, rental property, or multiple countries. If a reference paid wildly outside that range, understand why.
Red Flags in References and Responses
A reference who hesitates to recommend the firm or qualifies praise heavily ("they're okay if you're simple") suggests the firm doesn't truly excel at complex work. Watch for references who mention:
- Multiple amended returns (1040-Xs) filed after the initial return—this indicates the firm didn't get it right the first time.
- Surprise bills or fees that weren't quoted upfront.
- Slow communication or difficulty reaching the preparer during tax season.
- The client doing their own research to double-check calculations (you shouldn't need to audit your accountant).
Verify Credentials Beyond References
References alone aren't enough. Cross-check the firm's credentials:
Tax certifications: Look for EA (Enrolled Agent), CPA, or tax attorney credentials. An Enrolled Agent can represent clients before the IRS; many expat specialists hold this credential.
Specialization proof: Check their website for specific country expertise. A firm that says "we serve expats worldwide" without naming countries or showing case studies (anonymized, naturally) is likely a generalist. Reputable firms list their strengths—"US-Canada," "FEIE specialists," "UK-US dual citizens."
FBAR and FATCA knowledge: Ask directly how they approach FBAR filing thresholds, GILTI calculations (for foreign business owners), and PFIC regulations. Their answer should be detailed, not hand-wavy. This is non-negotiable for anyone with serious foreign assets.
Professional affiliations: Membership in AICPA, NAEA (National Association of Enrolled Agents), or specialized groups like the American Expat Center Network hints at ongoing education and professional standing.
Using Mercoly to Narrow Your Search
Before spending hours calling references, filter by firm reputation and specialization on Mercoly, which helps you compare and find trusted international expat tax providers in one place. This cuts down the initial list so you're only calling references from vetted firms that already match your needs.
Request a Trial Engagement
If references check out but you're still uncertain, propose a small, isolated project first. Ask the firm to prepare just your FBAR (Form 114) or handle a single foreign business question for a reduced fee. This gives you a low-stakes test of their communication, accuracy, and responsiveness before committing to a full return.
Frequently Asked Questions
Q: What's a reasonable timeline for an international tax return if I have all documents ready? A: Most reputable expat tax firms complete straightforward returns within 4–6 weeks; returns with foreign business income or multiple jurisdictions may take 8–10 weeks. Anything beyond 12 weeks signals potential issues.
Q: Should I hire a local (to my country) tax person or a US-based firm? A: For US citizens abroad, hire US-based specialists who know US law; a local accountant won't understand FBAR, GILTI, or treaty filing requirements. Some clients use both—a local for home-country compliance and a US firm for US obligations.
Q: How do I know if a firm truly specializes in my country? A: Ask them to explain your specific country's tax residency rules and how they interact with US reporting. A specialist answers immediately; a generalist will need to research.
Start with phone calls to references today—they'll clarify whether a firm is right for you faster than any website can.