The trick to any tax preparation or tax planning engagement is to do the work as if you would have to defend it in an audit. And when it comes to an audit, “Google said I could” is about as defensible as saying “I saw it on TikTok,” “I read it on Reddit,” “My cousin's friend said I could,” or the Twinkie Defense. What you need to defend in an audit and win is substantial authority (and really good books and records, but that is a topic for another day). This article provides some tips for conducting tax research that will get you to the authority you need.

When Your Client’s World Is Bigger Than the U.S.
A lot of client meetings still start with the same assumptions: W-2 in a U.S. state, mortgage nearby, a 401(k), maybe some RSUs, and a college-savings plan. Yet many of those “simple” clients now own an apartment in another country, freelance for a foreign company, or have parents wiring money from overseas. The tax code does not see those details as background color; it treats them as organizing facts. This is where citizenship, residency, and domicile quietly step onto center stage. For planners, the challenge is not memorizing every cross-border rule. It is knowing when a client is no longer “just domestic” and shifting your planning framework before you stumble into penalties, double taxation, or blown opportunities.


