@Chris Kendrick Check out the link in my signature. I wrote an article on taxes for flippers. @Randy Rodenhouse is correct, you have to pay the short-term capital gains rate both state and federal, which I believe is no different than the ordinary income bracket. If you do this for a living and flip multiple properties per year, you also have to pay the 15.3% self-employment tax. However, getting a smart tax strategy implemented where you switch your investing entity to be taxed as an S-Corp instead of a normal partnership, and pay yourself a salary is a way to lessen the impact of this SE tax.
Also, if you're a full time RE investor (per IRS definition) you can use passive losses against earned income. So, if you invest in long-term properties, as well as flip houses, you can legally offset all or most of this income by taking advantage of the depreciation benefits that the IRS gives to RE investors. For instance, if I passively invest in apartments, self-storage, etc. I will usually get a nice negative K-1 for the first year I invested due to taking advantage of bonus depreciation rules. This loss can then be used to offset earned income from house flips if the IRS considers you a full-time RE investor.
When you hear people saying that house flippers pay TONS of taxes, understand that they are usually comparing to long-term rental property investors and usually are not educated on the subject. Comparing an active business (ie. flipping houses) to a passive activity (long-term rentals) is an apples/oranges comparison. If you started a company buying and reselling widgets (which is how the IRS views flippers), you would never say "man it sucks that my active business isn't taxed like rental properties are taxed." Of course it isn't taxed like rental properties! It is an active business.
There are absolutely ways to reduce the tax burden when you own a house flipping company, it just requires some planning like any other business. Hope this helps!