86 Ill. Adm. Code 470.190
Discounts, Penalties and Finance or Interest Charges
Section 470.190 Discounts,
Penalties and Finance or Interest Charges
a) When taxpayers allow discounts from gross charges for services
under the Act because of prompt payment of accounts, the amounts of the discounts
are not included within gross receipts by which tax is computed.
b) When taxpayers add and collect penalties or interest upon delinquent
accounts or upon accounts involving installment payments, the amounts of the penalties
or interest need not be included in gross receipts, provided that the amounts
are separately itemized and billed to the persons to whom the services are
furnished, and separately recorded in the books and records of the taxpayer.
If the amounts of the penalty, interest or finance charges are not separately
billed and itemized to the person to whom the services are furnished and
separately recorded in the books and records of the taxpayer, the total amount
must be included in gross receipts by which the tax is computed.
c) When a "gross amount" and "net amount" are
billed to a customer on the same invoice for services furnished, the "net
amount" representing the charge if paid within a stated period of time, the
"gross amount" being the charge payable after the stated time has
elapsed, the difference between the two amounts is deemed to be a penalty or
interest charge separately billed.