Is it better to file as a resident alien or stay a nonresident if I qualify for both treatments?

It depends on how much foreign income you have and your filing status. Resident-alien treatment lets you use the standard deduction ($16,100 single, $32,200 married filing jointly for 2026), file jointly, and claim more credits—often lowering your tax if most of your income is U.S.-based. But it also subjects your worldwide income to U.S. tax, which can hurt if you have substantial foreign earnings or assets, even with the Foreign Tax Credit available. Nonresident treatment limits U.S. tax to U.S.-source income but usually denies the standard deduction and joint filing. The right answer comes from running your numbers both ways for your specific year. Married newcomers frequently find the resident election and joint return win on the deduction alone. Model both scenarios before you file, since the choice can be locked for the year once you submit.