On a standard Form 1099-G the amount in box 4 is federal income tax withheld, and the amount in box 11 is state income tax withheld. But some states do not use the standard form. The description of the amount of tax withheld on the 1099-G should identify whether it's federal tax or state tax. If not, you might have to ask the unemployment office or other department of your state government that issued the 1099-G.
Some states do not tax unemployment benefits. If your state does not tax the benefits, then any tax that was withheld has to be federal tax.
