@ckulmacz -- For tax year 2019, you are a part-year resident of VA and a part-year resident of DC. VA can tax all the income earned during your period of VA residency; DC can tax all the income earned during your period of DC residency.
The 183-day rule does not apply to your situation. You became a DC resident (and ceased being a VA resident) on the day you established your new domicile in DC. Your domicile is your main, permanent home.
The 183-day rule applies to those who are domiciled in another state and in VA (or DC) for temporary purposes, such as school.
Once you established your DC domicile, your income ceased being subject to VA taxation, assuming you commuted every day to VA and received only wage or salary income in VA.
You "established" your DC domicile on the day you began living in your new home in DC. (Temporary lodging such as a hotel doesn't count.)
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
