I am not eligible for IRA's. I am wondering about Capital Gains in a Taxable Account. I am considering investing $10K in S&P 500 Index Funds with a buy and hold strategy through the decades. As long as I don't sell, are there a lot of tax implications if the market goes up? In other words, if the market goes up for the year, and it goes to $12K, does that increase my tax burden for that year if the funds remain invested?