Choosing a Filing Status
Filing status is the first thing on the return and it quietly sets almost everything after it — which bracket table applies, the size of your standard deduction, and whether entire credits are available at all. Marriage does not automatically make joint filing the right answer, and for couples where one spouse is not a US person, the choice carries consequences that outlast the year.
Who this affects
- Married couples where one spouse is not a US citizen or resident
- Single parents and anyone supporting a household
- Recently married or separated taxpayers
- Anyone whose spouse has income and assets kept entirely in Korea
Joint filing pulls a non-resident spouse into the US system
Electing to treat a non-resident spouse as a resident so you can file jointly means their worldwide income becomes reportable to the IRS — including Korean salary, interest and business income. The lower joint rates can still win, but the trade is real and it is not obvious from the tax table alone.
Married filing separately is a legitimate answer
It is often described as the worst option because several credits are restricted under it, and it can require the ITIN discussed elsewhere in this silo. For a couple keeping the Korean spouse's finances outside the US system entirely, it is frequently still the better outcome.
The residency election is hard to reverse
Once made, the election to treat a spouse as a US resident generally continues until revoked, and revoking it carries a lasting restriction on making it again. This is a multi-year decision presented as a one-year checkbox.
Head of household is not simply 'single with a child'
It requires paying more than half the cost of maintaining a home for a qualifying person, and the tests are specific. It is more favourable than single filing, which is exactly why the qualifying conditions get examined.
Common questions
My spouse lives in Korea and has never been to the US. Can we file jointly?
Only by electing to treat them as a US resident, which makes their Korean income reportable to the IRS. Many couples in this position compare that against filing separately before deciding.
Is married filing separately always worse?
No. It restricts some credits, but where the alternative is exposing a Korean spouse's entire financial life to US reporting, separate filing often comes out ahead overall.
We married in December. Which status applies?
Marital status is generally determined as of the last day of the tax year, so a December marriage usually means you are treated as married for that whole year.
Official sources
General information, not tax advice. Rules and thresholds change, and how they apply depends on your circumstances — confirm with a licensed professional before acting.