Many small business proprietors start with a sole proprietorship to avoid the costs of forming a corporation or LLC. This can be a wise decision as statistics show that most small businesses throw money away for the first several years. Next, subtract the decimal equivalent rate from 2.00. Multiply this sum by the decimal equivalent get. Using the same example, for a pre-tax yield of.044 and a noticeably rate to do with.25 (25%), your equation is (1.00 >.25) x.044 =.033, for an after tax yiel...