The hardest part of hiring cross-border tax help is that the client can’t grade the work. A return gets filed, nothing bad happens, and “nothing bad happened” looks identical whether the return was complete or quietly missing three disclosures — for years (The Clock That Never Starts: How One Unfiled Form Keeps Every Year Open explains why missing forms stay silent). So the evaluation has to happen before the engagement, in the interview.

The good news: cross-border competence is detectable in ten minutes, because it shows up less in what a preparer answers than in what they ask.

The one real test: do they interrogate your situation?

A domestic preparer hears “I moved to Canada” and asks for your W-2 and your new address. A cross-border preparer hears the same sentence and starts pulling threads: When exactly did you move, and did you formally exit your state? What accounts did you open there — and do any exist for your kids? Any registered plans, and which kinds? A pension at the new employer? A spouse, and are they a US person? Anything you inherited or were gifted from outside the US? Any corporation, even a small one?

That questioning instinct is the entire product. Cross-border failures are dominated by things the client didn’t know were relevant and the preparer didn’t know existed — the account for a child, the “tax-free” local plan, the parents’ help with a down payment. A preparer who waits for you to volunteer your situation will file exactly what you knew to mention. The complexity lives in the intake, not the filing.

Questions that expose depth quickly

Ask what disclosure filings someone in your rough situation typically has, and listen for whether they distinguish the ones attached to the return from the one that isn’t (The FBAR Isn’t Part of Your Tax Return: Where It Actually Gets Filed). Ask how they handle the exclusion-versus-credit decision — the tell is whether they describe it as a decision with multi-year consequences or a default (Taking the Foreign Earned Income Exclusion Because the Software Suggested It). Ask how many clients they have in your corridor — country pairs matter, because the traps are pair-specific (RRSPs and the IRS: What the Treaty Handles Automatically — and What It Doesn’t problems don’t exist in other corridors). And ask what they’d want from you before quoting — a preparer who quotes a cross-border return without a detailed questionnaire is pricing blind, and blind pricing usually means shallow review.

Red flags worth trusting

“The treaty takes care of that” as a complete answer (Assuming the Treaty Works on Autopilot — What the US-Canada Tax Treaty Does and Doesn’t Do for You). Discomfort or vagueness when asked about foreign registered accounts by name. A firm that treats your situation as a domestic return with an extra form. And the subtle one: a preparer who never asks a question you can’t already answer — the whole value of a specialist is surfacing what you didn’t know to bring up.

None of this requires you to know tax. It requires watching whether they behave like someone who knows what they don’t yet know about you. The preparer who interviews you hardest before quoting is usually the one who files the complete return.

This is not a credential test; it is a screening heuristic. The real question is whether the preparer’s intake process is built to discover facts the client would not know to volunteer.

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