Married/RDP Filing Jointly You may file married/RDP filing jointly if any of the following is true:
- You were married/RDP as of December 31, 2018, even if you did not live with your spouse/RDP at the end of 2018.
- Your spouse/RDP died in 2018 and you did not remarry or enter into another RDP in 2018.
- Your spouse/RDP died in 2019 before the 2018 tax return was filed.
A married couple or RDPs may file a joint return even if only one had income or if they did not live together all year. However, both must sign the tax return.
Registered domestic partners (RDP) who file single for federal must file married/RDP filing jointly or married/RDP filing separately for California. If you are an RDP and file head of household for federal, you may file head of household for California only if you meet the requirements to be considered unmarried or considered not in a registered domestic partnership.