Skip to Content
skyscrapers framing cloudy sky

State & local tax alert: Illinois tax changes

July 12, 2017 / 4 min read

Senate Bill 9 enacts significant changes for Illinois taxpayers.

Senate Bill 9 was passed on July 6, 2017, through an override of Governor Rauner’s veto. The belowsections summarize the significant tax changes enacted by this legislation.

Net income tax

Tax rates

The net income tax rates for all types of taxpayers were permanently increased as follows:

Taxpayers whose tax years overlap with June 30, 2017, can compute their tax based on prorating theirincome between the period through June 30 and the period after June 30 through the end of thetaxpayer’s tax year. Under this method, income attributable to the period through June 30, 2017, iscomputed by multiplying the total income for the year by the ratio of the number of days in the taxpayer’stax year through June 30 over the total number of days in the tax year. For ease of computation, theDepartment of Revenue has provided a blended tax rate schedule that can be applied to a taxpayer’stotal taxable income (see Department of Revenue's Informational Bulletin FY 2018-2).

Alternatively, taxpayers can make an irrevocable election to use the specific accounting method. Thiscomputation is required to be reported on Schedule SA, which is expected to be available on theDepartment of Revenue’s website soon.

Because the tax rates impact 2017, taxpayers should take into account the increased rates when making future estimated and extension tax payments. Also, employers need to adjust withholding for the rate changes and the changes to the personal standard exemption and residential real property tax credit (see Other Income Tax Changes below). The Department of Revenue has indicated it will issue revised estimated tax payment worksheets on its website soon. For employers, an updated Booklet IL-700-T, Illinois Withholding Tax Tables, is available on the Department of Revenue’s website.

Note the replacement tax, which is also imposed on net income, remained the same at 2.5 percent for C corporations and 1.5 percent for pass-through entities.

Research and development credit

Other income tax changes

Sales tax

Unclaimed property

The information provided in this alert is only a general summary and is being distributed with the understanding that Plante & Moran, PLLC is not rendering legal, tax, accounting, or other professional advice, position, or opinions on specific facts or matters and, accordingly, assumes no liability whatsoever in connection with its use.

Related Thinking

Sunbeams coming through storm clouds.
July 16, 2024

Littlejohn disclosures and the IRS response: What should a taxpayer do?

Article 2 min read
Group of coworkers gathered around in a modern conference room.
July 15, 2024

Contingent consideration in M&A: What buyers need to know

Article 8 min read
Medical professionals reviewing information on their tablet computer.
July 2, 2024

Increased focus on IRC 501(r) compliance: Is your hospital prepared?

Article 10 min read