The IRS doesn't recognize registered domestic partnerships as married couples for tax purposes. Partners in an RDP can't file married for federal tax purposes. You must file Single on your federal tax return (unless you are the head of the household). You can file together or separately on your state tax return. You will be able to make the choice on how you file your state return within the TurboTax Desktop program.
When you're in an RDP in Oregon, you each will need to file a federal return as single and then you'd also need to prepare a third return as if you were filing married.
