@KD6883 TurboTax does not compare married filing joint and married filing separately. It will use your federal filing status on the California return.
California gives you the option to file separately if one spouse is a nonresident with no income from California. You will have to create a separate tax return if you wish to do this. California and Washington are both community property states so you will have to make an adjustment on your California separate return.
See: How do I prepare a joint federal return and separate state returns?
The only way to prepare a mock return online is to create a new user account with only your information. You will not be able to e-file the married filing separate California return because it does not match the federal filing.
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