Reinvested dividends
This isn’t really a deduction, but it is a subtraction that can save you a lot of money. And it's one that many taxpayers miss. If, like most investors, you have mutual fund dividends automatically invested in extra shares, remember that each reinvestment increases your “tax basis” in the fund. That, in turn, reduces the amount of taxable capital gain (or increases the tax-saving loss) when you sell your shares.
This isn’t really a deduction, but it is a subtraction that can save you a lot of money. And it's one that many taxpayers miss. If, like most investors, you have mutual fund dividends automatically invested in extra shares, remember that each reinvestment increases your “tax basis” in the fund. That, in turn, reduces the amount of taxable capital gain (or increases the tax-saving loss) when you sell your shares.