Orie and Jane, husband and wife, operate a sole proprietorship. They expect their taxable income next year to be $450,000, of which $250,000 is attributed to the sole proprietorship. Orie and Jane are contemplating incorporating their sole proprietorship. Using the married-joint tax brackets and the corporate tax rate, find out how much current tax this strategy could save Orie and Jane. How much income should be left in the corporation?