What kind of plan did you cash out? 401K or IRA? And how old are you? Did you roll it or convert it to another plan?
You didn't actually pay the tax or 10% penalty (you pay a 10% early withdrawal penalty if you are under 59 ½). You had taxes withheld like from your paycheck. You still have to enter the whole gross original amount (before taxes were withheld) with your other income to figure out the total tax (and it may put you into a higher tax bracket) and then the withholding is subtracted from the total tax to figure your refund or tax due. The withholding will show up on 1040 line 64 or 1040A line 40. The 10% penalty is on 1040 line 59.
Why did you close it? If you are under 59 1/2 you might have an exception tontje penalty.
