All of your income from that employer should be on your W2 and you report that W2 as a single W2 for the year. You can find more info on job separation in this IRS publication: <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-pdf/p4128.pdf">https://www.irs.gov/pub/irs-pdf/p4128.pdf</a>
