Did you receive a Form 1099-R or some other form for the withdrawal? See this IRS website for a Form 1099-R and notice there is a box labeled IRA/SEP/SIMPLE to the right of box 7 - <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-pdf/f1099r.pdf">https://www.irs.gov/pub/irs-pdf/f1099r.pdf</a>
