Shredding?

[progree]

11. Yup, that should be good enough for something like this (non-deduct contribs), but unfortunately

there's no tax form that documents what I paid for something (e.g. shares of stocks or mutual funds) at the time I bought it. Just the regular monthly or quarterly brokerage statements, and that includes shares bought through reinvested distributions.

I should add that's changed with some recent laws, e.g. beginning in 2012, brokerages kept track of the price paid for new shares as part of keeping track of the cost basis. So this only becomes an issue with pre-2012 shares. (Different asset classes have different start dates, I think 2012 is mutual fund shares IIRC).