86 Ill. Adm. Code 105.420
Who Must Test
Section 105
Section 105.420 Who Must
Test
a) All software developers whose software formats tax returns, or
transmits return information directly to the Department's communications
processor, must pass the IPATS test. (See Section 105.450.)
b) All electronic filers who transmit directly to the Department
must successfully complete the IPATS test. Hardware and software differences
may exist in their systems that could cause transmission problems. This also
ensures that electronic filers purchasing accepted software are able to use it
to transmit test returns prior to transmitting production returns.
c) Applicants who function solely as electronic return
originators and will not transmit directly to the Department do not need to
test.