Synopsis As Introduced Amends the Illinois Governmental Ethics Act. Provides that, among other restrictions, no legislator may accept or participate in any way in any representation case before the State of Illinois or any unit of local government in this State on any matter filed on or after February 1, 2018 that involves a challenge to any tax or proposed assessment of any tax or fee. Provides that the prohibition against participation in such a representation case does not apply in regards to a person with whom the legislator maintains a close economic association, unless a fee or compensation received regarding any matter that involves a challenge to any tax or proposed assessment of any tax or fee is received by the legislator directly or indirectly through any interest in a partnership, limited liability corporation, or other business entity. Modifies the term "representation case" to include matters before a unit of local government. Effective immediately.