Illinois does not have a personal property tax on individuals. The state abolished ad valorem personal property taxes under the 1970 Illinois Constitution, and no separate tax exists today on cars, furniture, or other belongings you own.1Illinois General Assembly. Illinois Constitution – Article IX – Section 5 Businesses, however, pay the Personal Property Replacement Tax (PPRT), an income-based tax on corporations, partnerships, S corporations, and trusts at rates ranging from 1.5% to 2.5% of net Illinois income. It replaced the old business personal property tax in 1979 and is measured by earnings, not by the value of equipment or inventory.
Why the Old Tax Was Abolished
The individual personal property tax was abolished in 1969 alongside the creation of the Illinois income tax. The 1970 Illinois Constitution then required the General Assembly to abolish all remaining ad valorem personal property taxes on businesses by January 1, 1979, and to replace the lost revenue for local governments and school districts.1Illinois General Assembly. Illinois Constitution – Article IX – Section 5 The constitution also prohibited reinstating any ad valorem personal property tax that had already been abolished.
To meet that deadline, the legislature enacted the PPRT in 1979. Instead of taxing the value of business machinery, equipment, and inventory, the new system taxes business income and routes the proceeds to local taxing districts through a state fund.2Illinois Department of Revenue. Personal Property Replacement Tax – Local Governments
Who Owes the Replacement Tax and How Much
The PPRT applies to every corporation, partnership, trust, and S corporation earning or receiving income in Illinois. Individuals do not pay it. The statutory rates are:3Illinois General Assembly. 35 ILCS 5/201 – Tax Imposed
- C corporations: 2.5% of net Illinois income
- Partnerships: 1.5% of net Illinois income
- S corporations: 1.5% of net Illinois income
- Trusts: 1.5% of net Illinois income
- Public utilities: 0.8% of invested capital
The PPRT sits on top of the regular Illinois income tax rather than replacing it. A C corporation, for example, owes the standard Illinois corporate income tax plus the 2.5% replacement tax on the same net income.3Illinois General Assembly. 35 ILCS 5/201 – Tax Imposed
How the Tax Is Calculated
The PPRT is measured by net Illinois income, which generally starts with federal taxable income and applies Illinois-specific adjustments. Because the tax is income-based, your liability depends on what your business earns, not on what your equipment or inventory is worth. Depreciation, business expenses, and other deductions that reduce federal taxable income also reduce net Illinois income for PPRT purposes.
Businesses operating in more than one state apportion their income to Illinois using statutory formulas. The applicable method varies by entity type and business activity. Over-apportioning income to Illinois means overpaying both the regular income tax and the PPRT, so multistate filers have a real incentive to get the calculation right.
Filing, Deadlines, and Estimated Payments
Each entity type reports the PPRT on its regular Illinois return, not on a separate form. Corporations use Form IL-1120, S corporations use IL-1120-ST, partnerships use IL-1065, and trusts use IL-1041.2Illinois Department of Revenue. Personal Property Replacement Tax – Local Governments
Returns are generally due on the 15th day of the third month after the close of the taxable year, meaning March 15 for calendar-year filers. Illinois grants an automatic seven-month extension to file, pushing the extended deadline to October 15 for calendar-year entities.4Illinois Department of Revenue. Who Must File Form IL-1120-ST and When Is Its Due Date? An extension to file is not an extension to pay. Any tax due is still owed by the original deadline.
Corporations must make quarterly estimated payments if their combined Illinois income tax and replacement tax liability is expected to exceed $400 for the year, with no exceptions. S corporations and partnerships must make estimated payments only if they elect the pass-through entity tax and expect their liability to exceed $500 for the year. Without a PTE election, those entities are not required to make estimated payments toward the annual PPRT liability.5Illinois Department of Revenue. Pub-105, Estimated Payments Requirements
What Late Filing and Late Payment Cost
Illinois charges separate penalties for late filing and late payment, and they can stack.
For late filing, the first-tier penalty is 2% of the tax due, capped at $250. If the return still is not filed within 30 days after the Department of Revenue sends a nonfiling notice, a second-tier penalty applies: the greater of $250 or 2% of the tax shown on the return, up to $5,000. The second-tier penalty is calculated without reducing for timely payments.6Illinois General Assembly. 35 ILCS 735/3-3 – Penalties
For late payment, the amount owed depends on how far past the due date you land. Pay within 30 days and the penalty is 2% of the unpaid tax. Pay after that and it jumps to 10%.7Illinois Department of Revenue. Publication 103, Penalties and Interest for Illinois Taxes That steep jump makes it worth paying whatever you can by the original due date, even if the return itself is going on extension.
Interest accrues daily on unpaid tax from the day after the due date until the balance is paid in full. The rate is simple interest at the federal underpayment rate, reviewed each January 1 and July 1. From January 2025 through June 2026, the rate is 7%.8Illinois Department of Revenue. Interest Rates Deliberate evasion or fraudulent reporting can lead to criminal prosecution beyond the civil penalties.
Out-of-State Businesses and When Illinois Can Tax You
A business based outside Illinois may still owe the PPRT if it earns income in the state. The threshold question is whether the business has enough of a connection, or nexus, to be taxed. Illinois follows the general constitutional standards requiring a substantial connection between the taxing state and the taxpayer.
Federal law provides an important shield. Under Public Law 86-272, a state cannot impose a net income tax on a company whose only in-state activity is soliciting orders for sales of tangible personal property, provided those orders are approved and filled from outside the state.9Cornell Law Institute. Illinois Admin Code Title 86, Section 100.9720 – Nexus Illinois recognizes this protection for the regular income tax and the PPRT. If in-state activities go beyond solicitation, the protection is lost for the entire taxable year.
Activities that can push a business past the solicitation line include maintaining a warehouse or office in Illinois, providing post-sale services through company employees, or performing installation and training work. The line is fact-specific, and misjudging it can create back liability plus interest and penalties dating to when the nexus was first established.
What the PPRT Is Not
The name causes real confusion. The PPRT is not a tax on your personal belongings. It replaced revenue that once came from taxing business personal property, but the replacement mechanism is entirely income-based, and no bill will ever arrive based on the assessed value of office furniture or delivery vehicles.
The PPRT also has nothing to do with the real estate property tax appeals process. The Board of Review, the Property Tax Appeal Board, and the circuit court appeal pathway exist to challenge real estate assessments.10Illinois Department of Revenue. Assessment Appeals – Property Tax Those bodies have no role in PPRT disputes. If you disagree with a PPRT assessment or penalty, your remedies run through the Illinois Department of Revenue’s administrative process.