The Internal Revenue Service (IRS) has published a chart outlining seven federal tax law characteristics of 501(c)(3),501(c)(4), 501(c)(5), 501(c)(6) and 527 organizations. The chart indicates whether such organizations may receive tax-deductible contributions, contributions or fees deductible as a business expense, engage in legislative advocacy, engage in candidate election advocacy, or engage in public advocacy not related to legislation or election of candidates.