Prior to tax reform, the C-corporation tax rates ranged from 15 to 35 percent. Under the new law, there is a 21% flat rate. Also under the new law, there is this new deduction known as the Qualified Business Income deduction that is available for Pass-Through Businesses. Synopsis The Tax Cuts and Jobs Act of 2017, otherwise known as the GOP tax reform bill, largely went into effect on January 1, 2018. If utilized properly, the new law can be significantly beneficial for business owners. To understand how the new laws can be beneficial for business owners, it’s important to be familiar with the two types of businesses that can have an impact on the taxation of a business entity.