Gov. Pat Quinn says he'll sign a bill allowing a 2016 special election to replace late Comptroller Judy Baar Topinka.
Quinn said he plans to ink the measure Saturday, along with a proposal allowing Election Day registration.
Topinka died last month after winning a second term. There's been disagreement about succession plans.
Republican Gov.-elect Bruce Rauner says his appointee should stay in the office four years. He plans to name Republican businesswoman Leslie Munger.
However, earlier in the week lawmakers in the Democrat-controlled House and Senate approved a plan that could cut Munger's term to two years. Munger has said she'll run in 2016.
The other bill essentially extends Illinois' pilot program with same-day voter registration, along with other changes. It was tested in November's election.