I lived in FL and IL for 6 mo in 2018. Sold FL home and moved to IL home 7/1/18. All W2 income earned in FL. Have portfolio income. Do I need to file 2018 taxes in IL?

[sdobrien1]

Have portfolio income.  How do I split this between the two states?

[TomD8]

Here is Illinois' rule:

If you were a resident of Illinois during part of the tax year, you are considered a part-year resident and must complete and file Form IL-1040 and Schedule NR if you earned or received income from any source while you were an Illinois resident.

https://www2.illinois.gov/rev/forms/incometax/Documents/currentyear/individual/il-1040-schedule-nr-i...

Therefore you have to determine the amount of portfolio income you received after becoming an Illinois resident.  You became an Illinois resident (and ceased being a CA resident) on the day you began living in your new home in Illinois.