Choosing a US expat tax preparer well is a screening problem, not a shopping problem. The volume of firms marketing to Americans abroad has grown faster than the pool of preparers who actually handle Passive Foreign Investment Companies, Streamlined Filing Compliance Procedures, and the international information-return set (Forms 5471, 3520, 8865, 8858) at real depth. The eight questions below are the ones that reliably separate a specialist expat practice from a general CPA who accepts expat work when it comes in, and from a marketing-first firm that hands the file to a junior generalist after the sale. This piece is informational — anyone facing a real engagement decision should verify credentials directly and consult a licensed cross-border adviser before signing.
The context matters. As the United States country page sets out, US citizens and green card holders are taxed on worldwide income regardless of where they live, with a top marginal federal rate of 37% for 2026, state taxes up to 13.3% additional, and a Foreign Earned Income Exclusion capped at $132,900 for 2026. The One Big Beautiful Bill Act signed 4 July 2025 made the TCJA rate structure permanent, so the ground under most expat returns is stable for the foreseeable future. What has not stabilised is the enforcement posture on the international information returns: base penalties starting at $10,000 per missed Form 5471 or Form 3520, and the compounding excess-distribution regime on PFICs, remain aggressively assessed. Choosing the wrong preparer for these filings is not a service-level annoyance — it is a five-figure risk.
Why the screen matters more than the price
Expat tax preparation fees for a US federal return typically run $500 to $10,000+ depending on complexity, as broken down in the 2026 fee benchmark. Within any given tier, the price spread between competent specialists is narrower than the spread between competent specialists and generalists dabbling in expat work. The point of screening is not to find the cheapest firm — it is to filter out preparers who will either miss required filings (the expensive failure mode) or over-file protective returns to cover their own inexperience (the second-most-expensive failure mode).
Two structural realities make screening harder than it should be. First, credentials alone do not tell the story: an Enrolled Agent with fifteen years of expat streamlined work is often stronger on the technical filings than a general CPA with a bigger office. Second, several firms with heavy marketing spend do genuinely competent work at the top of the file but hand the actual return preparation to junior generalists or outsourced overseas preparers. The eight questions below are designed to surface both problems in a single intake call.
The 8 screening questions
1. How many Streamlined Foreign Offshore filings did the firm complete last year?
The Streamlined Filing Compliance Procedures are the workhorse remediation route for US citizens abroad who missed filings without willful intent — three years of returns, six years of FBARs, and a non-willfulness certification on Form 14653. The mechanics are covered in the Streamlined filing analysis. A firm that completed fewer than roughly twenty Streamlined packages in the prior year is not necessarily inexpert, but the answer is diagnostic: the certification narrative is a written statement to the IRS that has to be technically accurate and internally consistent across three years of returns and six years of accounts. Firms that write dozens of these each year have templated but well-tested language and know exactly which factual patterns raise IRS follow-up. Firms that do a handful can be perfectly good, but the ask needs to be more searching about who drafts and reviews the certification.
The follow-up questions are: who drafts the Form 14653 narrative, who reviews it, and has any prior client's Streamlined submission been rejected or converted to a Streamlined Domestic or a Voluntary Disclosure track? Preparers who answer those questions with specificity are the ones worth quoting.
2. How does the firm handle PFICs, and does the flat fee include Form 8621?
Passive Foreign Investment Companies — mostly non-US mutual funds and ETFs held by US persons — are the classic expat trap. The default excess-distribution regime taxes gains and distributions at the top marginal rate (37% for 2026) plus a compounding interest charge, calculated on a hold-period allocation that makes even modest positions genuinely painful. As the PFIC rules explainer covers, the Qualified Electing Fund (QEF) and mark-to-market elections offer relief but each requires specific fund information and timely filing. Each PFIC generally requires its own Form 8621 each year.
The screening question has two parts. First, is Form 8621 preparation inside the flat fee, or an add-on (typical add-on: $150-$500 per fund per year)? Second, what election defaults does the firm apply, and does it flag PFICs in advance of holding decisions rather than only reporting them at filing time? A firm that treats PFICs as a mid-year advisory issue rather than a year-end reporting chore is doing the work correctly.
3. Does the firm prepare Forms 5471, 3520, and 8865 in-house?
US citizens with 10% or greater ownership of a foreign corporation face Form 5471 filing (often multiple schedules), plus GILTI and Subpart F calculation. Owners of foreign partnerships face Form 8865. Beneficiaries of foreign trusts or recipients of large foreign gifts and inheritances face Form 3520 and possibly Form 3520-A, as the Form 3520 explainer details. Each of these forms carries base penalties starting at $10,000, and the penalty regime is aggressive.
The mistake to screen out is preparers who quote a flat fee for a straightforward return, then discover partway through that the client has a foreign business or a foreign trust, and either subcontract the specialist forms without disclosure or produce them at unreasonable prices under change-order pressure. Ask directly: does the firm prepare Forms 5471, 3520, and 8865 in-house, at what quoted rates, and who is the specific preparer who handles them. A firm that outsources these forms to a specialist practice is not disqualified — but the client is entitled to know that, to know the specialist's credentials, and to have the outsourced fee quoted in advance. The GILTI guide for expat business owners covers the technical territory that these forms live in.
4. What credentials do the individual preparers hold, and who signs the return?
The three credentials that matter for US federal tax representation are: Enrolled Agent (EA), Certified Public Accountant (CPA) with active licensure, and attorney (JD, typically with a Master of Laws in Taxation for this work). All three carry unlimited representation rights before the IRS. A Preparer Tax Identification Number (PTIN) is required to prepare returns for compensation but is not itself a credential of expertise.
The screening question is not which credential is superior — the honest answer depends on the work — but who specifically will sign the return. Some firms staff intake with credentialed managers, then assign the file preparation to uncredentialed staff and have a credentialed preparer sign as the paid preparer of record. That arrangement is legal but the client should know it is happening, and should confirm that the signing preparer materially reviews the return rather than rubber-stamping it. Ask: what is the credential of the person who will draft the return, and what is the credential of the person who will sign it?
5. What is the firm's process for tracking multi-year positions?
Foreign Tax Credit carryovers under Form 1116 run for one year back and ten years forward, tracked separately by income category (general, passive, treaty-resourced, lump-sum). Unused credits are real money — a US citizen in a high-tax country like the United Kingdom (top rate 45%) or Germany (top rate 45% plus a 5.5% solidarity surcharge) frequently generates more foreign tax than can be used against US liability in any single year. The FEIE versus Foreign Tax Credit analysis covers the strategic choice, but the operational question at preparer selection is: does the firm maintain a carryover schedule that persists across preparer changes, and can they show a redacted example?
The parallel question applies to PFIC basis tracking, foreign pension basis and taxable events, and prior-year state departure positions. A firm without a persistent workpaper system will silently drop carryovers whenever staff turns over. Ask to see a sample multi-year carryover workpaper — the answer, or the reluctance to provide one, is informative.
6. Does the firm outsource preparation, and to whom?
Outsourcing US tax preparation to overseas contractors is common in the domestic industry and increasingly common at high-volume expat firms. It is not per se problematic — many outsourced preparers are technically competent — but three things should be disclosed. First, whether the client's data is transmitted outside the United States for processing (IRS regulations at 26 CFR 301.7216 require specific written consent for this in some scenarios). Second, whether the outsourced preparer is a credentialed EA or CPA or a staff preparer working under supervision. Third, whether the signing preparer reviews the work substantively or perfunctorily.
The way to screen is direct: is any part of the return preparation performed outside the United States, by whom, and what is that preparer's credential? A firm that outsources but has robust review is disclosing an operational fact; a firm that outsources and denies it, or hedges, is disclosing something else.
7. What is included in the engagement letter, and what triggers change orders?
Every specialist expat firm now quotes a flat fee. The question is what the flat fee actually covers. A typical inclusive scope covers federal Form 1040 with associated schedules, one of Form 2555 or Form 1116, Schedule B and the foreign account disclosure, one FBAR filing (FinCEN 114), and one round of review and revisions. Common exclusions billed separately include state returns ($150-$300 per state), additional FBARs for spouses or dependents, Form 8938 if FATCA thresholds are met, each Form 8621 for a PFIC, each Form 5471 or 8865 for a foreign business interest, Form 3520 for foreign trusts and gifts, amended prior-year returns, IRS or state notice response beyond a defined threshold, and tax-planning conversations outside the return itself. The FBAR and FATCA guide maps which of these filings apply at which asset thresholds.
Ask for the engagement letter before signing anything. Read the change-order clause specifically. Firms that price all foreseeable filings in advance and put them in the letter are the ones that produce accurate invoices; firms that keep the base fee low but leave scope open produce invoices with surprise line items.
8. What happens when the return is examined or the IRS sends a notice?
The final screening question surfaces both credential and posture. IRS representation is limited to EAs, CPAs, and attorneys. A firm that prepares returns using uncredentialed staff and does not have a credentialed representative available at reasonable cost when a CP notice arrives is offering a partial service. The question to ask is: if the IRS issues a notice on the return prepared by this firm, who handles the response, at what hourly rate, and is any amount of notice-response work included in the base fee.
The answer varies legitimately. Some firms include up to five hours of correspondence response in a base package; others bill from the first minute. Either is fine, but the client should know which it is at signing rather than at the moment of the letter's arrival.
Engagement-letter red flags
Beyond the eight questions, several patterns in the engagement letter itself warrant caution:
- No scope list at all. A one-page letter that quotes a fee for "your US federal expat tax return" without enumerating included forms is a bill waiting to expand.
- No named preparer or reviewer. Firm-signed engagement letters that never identify the individual credentialed preparer conceal who is actually responsible.
- Broad indemnification clauses that shift IRS penalty risk to the client for the firm's own errors. Standard clauses limit liability to fees paid; clauses that go further deserve a second read.
- Data-processing consent language that permits transmission outside the United States without a specific opt-in. IRS §7216 consent should be discrete and revocable.
- Ambiguous PFIC and 5471 language. Letters that say "additional filings billed separately" without giving per-form rates leave the price fully open.
- Payment structures that require full fee upfront before scope is finalised. Reasonable retainers are standard; full prepayment before a completeness review of the intake is not.
How to detect outsourcing to general preparers
Outsourcing to a specialist expat preparer under contract is one thing; assignment to a domestic-tax generalist inside the same firm is another. Two indicators are useful. First, ask the intake contact who specifically will prepare the return, then ask the same question of anyone else at the firm the client speaks to. Consistent answers correlate with real staffing plans; shifting answers correlate with generic assignment.
Second, ask a diagnostic question that a specialist should answer without hesitation. "How do you treat a UK ISA on a US return?" is a good example — a specialist knows immediately that an ISA is a PFIC-heavy account with no US recognition of the tax-advantaged wrapper and typically flags it as a Form 8621 concern. A generalist frequently answers "we'll look at that when we see the statements." The specific test question can vary — treatment of a French Assurance Vie, a German Riester pension, an Australian superannuation grantor-trust position — but the pattern holds: real experience produces confident conditional answers to specific fact patterns, and inexperience produces referrals to a later look.
Credential shorthand: EA, CPA, JD-LLM
All three carry full IRS representation rights. Practical differences worth understanding:
- Enrolled Agents are federally licensed specifically for tax practice. Many long-tenured expat specialists are EAs. Continuing education is tax-focused.
- CPAs are state-licensed and cover a broader accounting and audit scope; individual CPAs vary widely in tax depth. A CPA with an active practice in international personal tax is often equivalent to or stronger than a general EA on complex structures; a CPA whose day-to-day work is corporate audit is usually not.
- Tax attorneys with an LLM in Taxation add attorney-client privilege on written advice, which matters primarily for cases involving prior non-compliance discovery, potential willfulness assessment, expatriation planning under Form 8854, or contested treaty positions. Overkill for routine expat returns; often essential when the fact pattern touches the criminal-referral line.
For a typical US citizen abroad with wages, some passive income, and standard reporting, an experienced EA at a specialist firm is usually the right cost-quality point. For a business owner facing Form 5471 and GILTI, a CPA or attorney with cross-border corporate experience is appropriate. For a Streamlined case with any factual uncertainty about willfulness, an attorney should be involved at least at the advisory level before the certification is signed.
Where to go next
The fee context for the choices above is in the 2026 US expat tax preparation cost benchmark and the broader cross-border adviser selection guide. For the technical filings that drive preparer selection, see the PFIC rules explainer, the GILTI guide, the FBAR and FATCA guide, and the Form 3520 explainer. On remediation, the Streamlined filing analysis covers eligibility. For US citizens weighing an initial move, the 2026 guide for US citizens moving abroad sets the wider picture, and the United States country page holds the current rates and thresholds. General questions are collected in the FAQ.