I was a graduate student until May 2016. I got a full-time job on July 6, 2015 but I quit that job and started working at my new full-time job on December 28, 2015. My first paycheck for the new job did not arrive until January 2016 because the pay period was until January 8, 2016(every 2 weeks).
You report taxable income when you actually received the money, not when it was earned.
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