First, you should ask your employer to update your record of home address to reflect your CA home - if they're not withholding CA tax then you'll have a huge CA tax bill due next April. Second, you can use documentation such as your lease agreement and utility bills to prove residency in CA. I do recommend that you switch to a CA license, not so much to prove residency for tax purposes but because that's what you're supposed to do within 30 -60 days of moving into a new state. As for your NJ return - did you file NJ1040-NR (non resident return) showing $0 NJ-based income to justify getting a full refund? Also, what did you do in previous years, when you were living and working in KS - you didn't pay NJ income tax, did you?
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