I owned an S corp in 2016, I have a w2 from my accountant; is income from this "self employed income"

[ToddL · Accepted solution]

Technically, "No". If you received a W-2 it is not treated as self-employment income - even if you were your own boss.

Your employer  (the S-Corp) would have paid the employer's share of your employment taxes (Social Security & Medicare) and withheld your share for remittance to the IRS. The S-Corp would probably also withheld federal tax from you W-2 income, and remitted that to the IRS as well.