#1 California

State income taxes apply to California residents. Since the state uses a progressive income tax system, your tax rate will increase as your income increases. The income tax rate for California is 13.3%. 

In this state, the standard deduction is $4,803 for single taxpayers and $9,606 for those who are married. 

You must submit a state tax return if you earned money while living in California for any period of the tax year. If you didn’t reside in California yet worked for a business there, you could also need to file. The California State Franchise Tax Board will assist you in determining your eligibility for filing. There, among other things, you can submit your return online and pay your taxes.