like if you were to purchase stock through a broker each time you buy that s a block.
in theory, every time you put money in that's a block. however, for an s-corp that would require tracking separate basis or each block and would require per share per day allocations.
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most of the time there is no stock actually issued. so the easiest is to assume you only have 1 block. this would be especially true for an LLC that elected S-corp taxation because there is no stock.
