If you received severance pay, including payment for unused vacation or sick days, those
amounts are fully taxable to you in 2017. Those amounts will be
included on the W-2 form you receive from your former employer.
It is likely that will be tax law changes in 2017, but we don't know yet what they will be. But see this:
https://turbotax.intuit.com/tax-tools/tax-tips/General-Tax-Tips/What-is-the-Federal-Supplemental-Tax...
and remember your State taxes.
