The most common mistake buyers make when comparing Illinois retirement costs to Arizona or Florida is forgetting this: Illinois imposes a flat 4.95% income tax rate, but it exempts retirement income completely. A household drawing $80,000/year from Social Security, a pension, and IRA withdrawals pays zero Illinois state income tax on any of it. That is not a minor footnote — it is $3,960 per year that Sun Belt states like Arizona (2.5% flat on retirement income) or Wisconsin (graduated up to 7.65%) do collect.
Property taxes are the genuine Illinois burden. But the income tax exemption is the counterweight that most analysis ignores.
What Illinois Exempts — and What It Does Not
✓ Fully Exempt from Illinois Income Tax
- Social Security benefits (all amounts)
- Railroad Retirement benefits
- Illinois state pension income
- Federal pension income (CSRS, FERS)
- Military retirement pay
- Traditional IRA distributions
- 401(k) and 403(b) distributions
- Roth IRA distributions (qualified)
- Private pension and annuity income
- Survivor benefits
✗ Subject to Illinois 4.95% Flat Tax
- Wages and salaries (if still working)
- Self-employment income
- Rental property net income
- Capital gains on non-retirement investments
- Interest and dividend income
- Business income
The Tax Savings — Quantified by Retirement Income Level
| Annual Retirement Income | Illinois State Tax | Arizona (2.5% flat) | Wisconsin (est. ~5.3% avg) | IL Advantage vs. AZ |
|---|---|---|---|---|
| $50,000/yr | $0 | $1,250 | $2,650 | +$1,250/yr |
| $75,000/yr | $0 | $1,875 | $3,975 | +$1,875/yr |
| $100,000/yr | $0 | $2,500 | $5,300 | +$2,500/yr |
| $150,000/yr | $0 | $3,750 | $7,950 | +$3,750/yr |
| Over 10 years ($100K/yr) | $0 | $25,000 | $53,000 | +$25,000 vs. AZ |
Arizona's 2.5% flat rate on retirement income is relatively low compared to most states — but it is not zero. Over a 10-year retirement drawing $100K/year, the difference between Illinois and Arizona is $25,000 in state income tax that Arizona collects and Illinois does not. That figure offsets a significant portion of the Illinois property tax premium.
The Full Comparison: Illinois vs. Arizona on a $350K Home
Household drawing $90,000/year in retirement income
| Cost Item | Illinois (DuPage Co.) | Arizona (Maricopa Co.) |
|---|---|---|
| State income tax on retirement income | $0 | $2,250/yr |
| Property tax — $350K home | ~$7,000–7,700/yr | ~$2,100–2,500/yr |
| Total annual tax burden (estimate) | ~$7,000–7,700 | ~$4,350–4,750 |
| Annual gap | Arizona saves ~$2,600–3,350/yr at comparable home prices | |
Arizona wins on total tax burden when home prices are similar. The Illinois advantage grows as retirement income rises (because the income tax exemption saves more) and shrinks as home prices rise (because higher IL property taxes widen the gap). The crossover point is roughly $200K+/year in retirement income at comparable home values.
Where Illinois Beats Arizona in the Tax Math
Illinois wins the tax comparison in specific scenarios that most analysis misses:
High Retirement Income + Modest Home
A household drawing $200,000/year in pension and IRA income who buys a $250K home in Illinois pays essentially zero state income tax and relatively low property tax. In Arizona, $200K in retirement income generates $5,000 in state income tax. The Arizona property tax savings on a $250K home (~$3,500/year) do not fully offset the $5,000 income tax bill. Illinois wins by roughly $1,500/year.
Illinois Pension Recipients
Illinois state employees, teachers, and public safety workers with Illinois pensions face a specific trap if they move to Arizona: Arizona taxes all pension income including Illinois state pensions. A retired IMRF participant drawing $60,000/year in pension income pays zero in Illinois and $1,500/year in Arizona. This is the single most underreported cost in the Illinois-to-Arizona migration analysis.
The Wisconsin-to-Illinois Move
Wisconsin taxes retirement income at graduated rates up to 7.65%. A Wisconsin retiree drawing $100K/year in pension and IRA income pays approximately $5,300/year to Wisconsin. Moving to Illinois saves that entire amount — even with Illinois's higher property taxes, the total tax burden often drops for Wisconsin retirees moving to the Chicago suburbs.
What the Exemption Does Not Fix
Illinois property taxes remain the genuine burden. The senior programs help (see the Senior Assessment Freeze guide), but the effective rates — 2.0–2.5% in DuPage, 2.2–2.8% in Lake County — are among the highest in the nation. On a $400K home, that is $8,000–$11,200/year regardless of your income. No exemption eliminates that.
The income tax exemption is a real and substantial advantage for retirement income. It does not overcome high property taxes on expensive homes. For buyers choosing between a $450K home in a Chicago suburb and a $300K home in Arizona, Arizona almost certainly wins on total tax burden. For buyers comparing similarly priced homes in the $200K–$320K range, Illinois is often competitive or better once income tax is factored in.
How to Apply the Exemption
No special application is required. Illinois's retirement income exemption is built into the IL-1040 tax return. Retirement income is simply not included in Illinois Adjusted Gross Income (AGI). If you file a return because you have wages, self-employment income, or capital gains, your retirement income distributions do not appear on the Illinois return as taxable income.
For retirees whose only income is Social Security, pension, and retirement account withdrawals, you may not be required to file an Illinois return at all — you have no taxable Illinois income.
Questions About Illinois Retirement Tax Planning?
Connect with a buyer agent who knows the Chicago-area 55+ market and can connect you with Illinois tax specialists for your specific situation.
Talk to an AgentRelated: Illinois vs. Arizona Full Retirement Tax Comparison · Illinois Senior Assessment Freeze Explained · Chicago Metro 55+ Community Guide