So I don't need to report my CA trips after May in my tax return since they are irrelevant, right? No. It does not matter where the company you worked for was located. It DOES matter if you physically performed work in the state of CA. So, if your company headquarters moved to KY and you went to work in CA for 25 days when the headquarters were in CA, then you would need to file a CA nonresident return.
And I don't need to file the CA state tax for 2024 even I may have some more CA trips this year, right? No, that is incorrect. If you are physically present in the state of CA, you DO need to file a nonresident return claiming the income that you earned while physically present. Since you are salary, it would be the salary divided by the total number of days you work in a year multiplied by the number of days you worked in CA.
But I still need to pay the CA state income tax for my CA trips before May 2003 since before then my payroll location was in CA, right? Yes, you need to pay tax on the income both BEFORE AND AFTER the payroll location moved.
I also had a business trip to NY after May, does NY has the same tax rule for short business trips to NY? Absolutely ANY day you were physically present working in NY, regardless of where the payroll department was located, you will need to include on a Nonresident NY return.
This is true of all states that have a state income tax. If you are physically present in that state to work, you have to file a nonresident return if you earned more than the filing threshold for that particular state. Not all states have a minimum.
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