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Other than being able to borrow to invest, how is a margin trading account different from a cash account?
Two more esoteric differences, related to the same cause... When you have an outstanding debit balance in a margin the broker may lend out your securities to short sellers.  (They may well be able to lend them out even if there's no debit balance -- check your account agreement and relevant regulations).   You'll never know this (there's no indication in your account of it) unless you ask, and maybe not even then. If the securities pay out dividends while lent out, you don't get the dividends (directly).  The dividends go to the person who bought them from the short-seller.  The short-seller has to pay the dividend amount to his broker who pays them to your broker who pays them to you.  If the dividends that were paid out by the security were qualified dividends (15% max rate) the qualified-ness goes to the person who bought the security from the short-seller.  What you received weren't dividends at all, but a payment-in-lieu of dividends and qualified dividend treatment isn't available for them.   Some (many?  all?) brokers will pay you a gross-up payment to compensate you for the extra tax you had to pay due to your qualified dividends on that security not actually being qualified. A similar thing happens if there's a shareholder vote.  If the stock was lent out on the record date to establish voting eligibility, the person eligible to vote is the person who bought them from the short-seller, not you.  So if for some reason you really want/need to vote in a shareholder vote, call your broker and ask them to journal the shares in question over to the cash side of your account before the record date for determining voting eligibility.