They could say effective immediately or 1 month after the public votes on it, no?
Do you trust them enough that they would not pull any parliamentary tricks or even lower the proposed tax bracket AFTER they get it passed? Its $250k now, they will just lower it to $50k or $100K and shrug their shoulders and say they need more money to support the spending and wealth distribution.
From the Illinois constitution.
SECTION 2. AMENDMENTS BY GENERAL ASSEMBLY
(a) Amendments to this Constitution may be initiated in
either house of the General Assembly. Amendments shall be
read in full on three different days in each house and
reproduced before the vote is taken on final passage.
Amendments approved by the vote of three-fifths of the
members elected to each house shall be submitted to the
electors at the general election next occurring at least six
months after such legislative approval, unless withdrawn by a
vote of a majority of the members elected to each house.
Amendments proposed by the General Assembly shall be
published with explanations, as provided by law, at least one
month preceding the vote thereon by the electors. The vote on
the proposed amendment or amendments shall be on a separate
A proposed amendment shall become effective as the
amendment provides if approved by either three-fifths of
those voting on the question or a majority of those voting in
© The General Assembly shall not submit proposed
amendments to more than three Articles of the Constitution at
any one election. No amendment shall be proposed or submitted
under this Section from the time a Convention is called until
after the electors have voted on the revision or amendments,
if any, proposed by such Convention.
(Source: Illinois Constitution.)