Yes, in general, regular IRA distributions are subject to the $20,000 exclusion. There are really only two kinds of "compensation" that would be allowable under federal law for making IRA contributions that are not allowable for the New York exclusion; educational fellowships and alimony. If, somehow, a portion of your IRA was funded by alimony payments or an education fellowship after your retirement, your exclusion will be pro-rated. (For example, if 10% of your IRA was funded after you retired using money paid to you by an ex-spouse as alimony, then even if you withdrew only $20,000, 10% of the distribution would be ineligible for the exclusion and would be taxed.) These will be uncommon situations for most people.
Remember that even if the IRA distribution is excludable in NY, it will still be taxable at the federal (IRS) level, depending on your other facts and circumstances.
