50 Ill. Adm. Code 4450.30
Definitions
Section 4450.30 Definitions
"Illinois
Pension Code" or "Code" means 45 ILCS 5.
"Department"
means the Illinois Department of Insurance.
"Lump Sum"
means the one payment to the recipient by a pension fund when a benefit was
mistakenly set too low. A lump sum payment shall consist of two amounts:
the difference
between the mistakenly set too low benefit and the correct level benefit for
each such benefit payment; and
the
application of the prescribed 1% annual interest rate to the difference derived
under this definition from the date of each mistakenly set too low benefit to
the date of payment of the lump sum.