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Chicago

Bookkeeping services in Chicago

Outsourced bookkeeping for Chicago companies, including the Illinois replacement tax that sits on top of corporate income tax.

Parag Jain, CPA
Parag Jain, CPAFounder, Zinance·Last updated August 2026·5 min read

Summarize this article

At a glance

Illinois corporate tax
Two componentsCorporate income tax plus replacement tax
Replacement tax
Applies to pass-throughs tooPartnerships and S corps are not exempt from it
Common miss
Budgeting one rateThe replacement tax is separate and additional

Illinois charges corporations two things where most states charge one. Companies that budget for the headline corporate income tax rate and stop there are under-reserving, and they find out at filing.

The tax with the confusing name

The Personal Property Replacement Tax is not a tax on personal property. It replaced a property tax that was abolished, kept the name, and is now an additional tax on income, collected on top of the corporate income tax.

It also reaches entities that assume they are outside corporate tax entirely: partnerships and S corporations owe replacement tax even though their income passes through to the owners.

Why the books matter here

Two taxes on the same base means the apportionment and the add-backs have to be right once and then used twice. A close that produces a defensible Illinois number produces both filings; a close that does not produces two problems.

What we do for Chicago companies

Daily categorisation and reconciliation, a monthly close with a named accountant, and Illinois reserved for properly rather than at the headline rate. Delaware C-corps get the franchise tax handled alongside the Illinois filing.

We are remote, with no Chicago office.

Frequently asked questions

What is the Illinois replacement tax?+
An additional tax on income, charged on top of the corporate income tax. Despite the name it is not a property tax — it replaced one that was abolished. Partnerships and S corporations owe it too, which surprises pass-through entities that assume corporate taxes do not apply to them.
Do we owe it as an S corp?+
Yes. The replacement tax applies to partnerships and S corporations as well as C corporations, even though the income itself passes through to the owners.

Numbers you can actually trust

Zinance is outsourced bookkeeping, tax, and fractional-CFO support built for fast-growing companies, flat pricing, a dedicated human, and books that stay current every day.

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