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First things first. I have a question, so I go to this board, and - magic - there is a post with my question, and a few posts with answers and worksheets. Makes you forget about how annoying taxes can be ...

OK, now the question. I understand how to calculate cost basis for a single lot of shares in a stock transaction (thanks to the post on this board). But if I had multiple lots with different cost basis, how do you decide which one generated fractional shares that were paid in cash for a taxable event. Also, if I already own stock of an acquiring company, and, technically, I sold fractional shares of that stock in a merger transaction, do I apply that sale to the stock that was newly issued in transaction, or I have to use FIFO rules.

Same questions about stock split. In an uneven split how do I decide which shares where partialed and sold?
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