The simple process of selling and buying won't cost you anything. It would be like selling a dollar and then buying a dollar. The market could fluctuate a little in the time you money is on the sidelines, usually not more than a couple days, but that could go either way. The market could go down a little and you buy back in slightly lower, or vice versa. Either way it's inconsequential in the long run. As other's have mentioned, the difference in fees is huge. You could sell, see the market rise a percent, then buy back in, and just a 1% lower fee offsets that action entirely, plus you then have the advantage of lower fees for the rest of your life.