That's correct that the new C Corp rate is a flat 21%. Based on your comments I'm assuming your personal top rate is higher than that. But you also need to keep in mind that the 21% on the corp's profit and it's not your money. To operate as a C corp you'll need to put yourself on payroll which means roughly 20% in payroll taxes between federal and state, then your regular income tax rate on whatever your w2 wages are. If you want to take money out beyond that then they're treated as dividends which (best case scenario) will be taxed at your long term capital gains rate. In either case you're looking at over 40% no matter how the money comes out. (payroll tax + personal tax and/or corp tax + personal tax). It's rare that putting real estate into a corp is a good idea.
