The Illinois Department of Revenue will not assses penalty for late estimated payments due for tax years ending before December 31, 2022. This is due to the elcection to pay the entity-level tax under Public Act 102-0658. The Illinois Department of Revenue reccomends people make estimated payments to reduce the tax payment due when the return is filed.
Public Act 102-0658, which was created August 27, 2021, created an entity-level tax for partnerships and subchapter S Corporations allowing partners and shareholders to work around the federal cap on the deduction for state and local taxes effective for tax years ending on or after December 31, 2021. When a partnership or S Corps makes the election to pay the entity-level tax, it’s required to make quarterly estimated payments if the tax due is expected to be $500 or greater, or you could incur late payment penalties for the underpayment of estimated taxes per Illinois Income Tax Act Section 804.
For most taxpayers, two estimated payment deadlines have passsed already and the third quarter estimated payment for calender-year filers is due by September 15, 2021. Partners and shareholders of pass-through entitites should continue making all required quarterly installmments even if they expect the pass-through entity to pay an entity-level tax.