And I believe this extends to sale before 1997 when the law changed. But I've always had trouble finding a reference for that.
So if I (all primary residence):
Bought in 1978 @ $30,000
Sold in 1983 @ $45,000, and bought a home that year for $100,000
Sold that $100,000 home for $200,000 in 1993...
So far, no cap gains under pre-1997 rules as I moved up in cost. And it would seem to me, no need to keep records going back, as moving up was all that was required to avoid cap gains taxes, right?
But what happens if I sell in 2019, for more than $700,000? Is my cost basis $200,000 (plus capital improvements), or does it 'chain' back to 1978, and I'd have to add the gains on previous homes?
It seems unreasonable to expect records for pre 1997, if those records were not needed at the time?
But I guess this is what you are saying? You need to follow the "Chain" all the way back? But wait... a 2000 sale would not be 'sheltered' by buying a more $ house, that was pre-1997. I'm lost again.
-ERD50