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Nonresident Spouse Treated as a Resident

If, at the end of your tax year, you are married and one spouse is a U.S. citizen or a resident alien and the other spouse is a nonresident alien, you can choose to treat the nonresident spouse as a U.S. resident. This includes situations in which one spouse is a nonresident alien at the beginning of the tax year, but a resident alien at the end of the year, and the other spouse is a nonresident alien at the end of the year.

If you make this choice, you and your spouse are treated for income tax purposes as residents for your entire tax year. Neither you nor your spouse can claim under any tax treaty not to be a U.S. resident. You are both taxed on worldwide income. You must file a joint income tax return for the year you make the choice, but you and your spouse can file joint or separate returns in later years.
If you file a joint return under this provision, the special instructions and restrictions for dual-status taxpayers in chapter 6 do not apply to you.

Example.

Bob and Sharon Williams are married and both are nonresident aliens at the beginning of the year. In June, Bob became a resident alien and remained a resident for the rest of the year. Bob and Sharon both choose to be treated as resident aliens by attaching a statement to their joint return. Bob and Sharon must file a joint return for the year they make the choice, but they can file either joint or separate returns for later years.
How To Make the Choice

Attach a statement, signed by both spouses, to your joint return for the first tax year for which the choice applies. It should contain the following information.

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A declaration that one spouse was a nonresident alien and the other spouse a U.S. citizen or resident alien on the last day of your tax year, and that you choose to be treated as U.S. residents for the entire tax year.
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The name, address, and identification number of each spouse. (If one spouse died, include the name and address of the person making the choice for the deceased spouse.)