How New York taxes severance
New York withholds a flat 11.7% state tax on supplemental wages like severance — among the highest in the country — on top of the 22% federal supplemental rate, Social Security, and Medicare. New York City residents pay city withholding (roughly 4.25%) as well, and Yonkers has its own surcharge. As everywhere, withholding is an estimate: your real liability is computed on your return from full-year income.