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@msdalt01 You went through the mathematical calculations that are from which the annually revised   (increased) cost basis is published nowadays on the broker statements (now required). Yes, indeed, at the end of the calculations you are likely to show a slight reportable taxable gain or a slight reportable capital loss depending on how close to the annual date from issuance you do the calculations.  Think of it another way, the same mathematics go in to the matter of bid price on a bond in the days or months before semi-annual interest due date (this used to be a big deal when coupons could be stripped).  The same mathematics play into the bid price on a share of stock in the days before X-date (date when a dividend is attributable to registered owner).
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