Taxes in Naperville
Illinois levies a real, simple flat 4.95% state income tax on most earned income -- and, a genuine, substantial positive, does NOT tax Social Security, pensions, or 401(k)/IRA distributions -- while Naperville residents separately carry a real, high property tax burden (2.05%-2.35% effective, depending on county) and a combined sales tax running 7.75%-8.75% by ZIP, a fuller picture this record states plainly rather than letting the flat income tax rate alone define Naperville's tax profile.
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Learn moreIllinois's Flat 4.95% State Income Tax, and What It Deliberately Does Not Tax
Illinois taxes most earned income at a simple, flat 4.95% rate -- no brackets, no marginal-rate complexity. Critically, Illinois does NOT tax Social Security, pensions, or 401(k)/IRA distributions, a real, substantial, and genuine relocation positive for Naperville's meaningful retiree population that this record does not bury under the state's other real fiscal negatives.
Property Tax Is Naperville's Real, Substantial Tax Negative
As detailed in full on the property-taxes topic page, Naperville's effective property tax rate runs a real, disclosed 2.05% (DuPage side) to 2.35% (Will side) -- both well above the roughly 0.9% national average, consistent with Illinois's own real, statewide high-property-tax profile (around 2.08% average effective rate, among the highest in the country, per illinoisMarketManifest.js).
Naperville's Combined Sales Tax Runs a Real, Disclosed 7.75%-8.75% by ZIP
Naperville's combined sales tax layers Illinois's 6.25% state base rate with the city's own 0.75%-1.25% portion and a 0.75%-1.75% special-district add-on, producing a real, disclosed range of 7.75%-8.75% depending on the specific ZIP code and taxing district.
Illinois's Own Statewide Fiscal Context Is Real and Disclosed, Not Naperville-Specific
Illinois carries a real, substantial statewide fiscal negative -- roughly $143.5 billion in unfunded state pension liabilities as of November 2025, and the lowest state credit rating in the nation (though Moody's affirmed A3 and revised the outlook to positive in mid-2025, a real, disclosed sign of incomplete but genuine fiscal improvement). This is a statewide, not Naperville-specific, fact that indirectly shapes the state's overall tax and services picture.
The Full Picture: A Simple Income Tax, a High Property Tax, and a Real Retirement-Income Exemption
Naperville movers should budget for the state's simple, flat 4.95% income tax alongside a real, disclosed 2.05%-2.35% effective property tax rate and a 7.75%-8.75% combined sales tax -- while retirees specifically benefit from Illinois's genuine, substantial exemption of Social Security, pension, and 401(k)/IRA income from state tax.
Key takeaways
- Illinois's flat 4.95% state income tax is genuinely simple, and does NOT tax Social Security, pensions, or 401(k)/IRA distributions -- a real positive for retirees.
- Naperville's effective property tax rate runs a real, disclosed 2.05% (DuPage side) to 2.35% (Will side), both well above the national average.
- Naperville's combined sales tax runs a real, disclosed 7.75%-8.75% depending on the specific ZIP/taxing district.
- Illinois carries a real, substantial statewide fiscal negative (~$143.5B in unfunded pension liabilities) alongside a real, disclosed sign of incomplete but genuine improvement (Moody's positive outlook revision, mid-2025).
- The full tax picture combines a simple income tax, a genuinely high property tax, and a real retirement-income exemption -- no single figure tells the whole story.
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