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I took RMD from my Traditional IRA.  I had 401K from my job, and when I retired several years back, I set up a Traditional IRA and then rolled over my 401K into Traditional IRA, and never made contribution to Traditional IRA.    My IRA custodian never provided Form 8066.   How do I figure out Total Basis of Traditional IRA if it's not zero.  Your advice is very much appreciated.