Hello,
According to IRS regulations a Registered domestic partners may not file a federal return using a married filing separately or jointly filing status. Registered domestic partners are not married under state law. Therefore, these taxpayers are not married for federal tax purposes.
Here is a link to an IRS article on frequently asked questions for registered domestic partners.
https://www.irs.gov/newsroom/answers-to-frequently-asked-questions-for-registered-domestic-partners-...
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