The "almost always" answer: When you have a distribution from a Traditional IRA (or 401(k)) it is treated as income; you don't get to deduct any basis from the withdrawl. There's a wrinkle: If you made non-deductible IRA contributions, the distributions may be only partly taxable:
https://www.irs.gov/publications/p590b#en_US_2018_publink[phone number removed]
