Does the FBAR or Form 8938 create a tax bill by itself?

No — filing the FBAR or Form 8938 does not, by itself, generate any tax. Both are informational disclosures: they tell the U.S. government what foreign accounts and assets you hold and what they're worth, not what you owe. You can report millions across foreign accounts and owe nothing extra purely from filing these forms. The tax comes from the income those assets produce — interest, dividends, capital gains, rental income — all of which a U.S. person reports on the 1040 as worldwide income regardless of whether a reporting form applies. So the danger isn't the FBAR; it's forgetting to report the underlying foreign income, or holding tax-inefficient assets like foreign mutual funds (PFICs). Treat the FBAR and 8938 as transparency, and focus your tax planning on the income side. File the informational forms on time, and report the income they hint at. See wealthserene.com/for/immigrant-nri.