I am a US citizen.
I quit my job in California and moved to take another job in the UK in October 2013. For FY 2013, I filed both federal and CA state taxes, since part of that year's income came from my previous job in the US.
In this tax year (FY 2014), all of my income came from my UK job. I'm pretty sure the income is below that threshold (~$100k?) where you pay no federal taxes.
I plan to still file my Federal taxes of course, but do I still need to file CA state taxes?