The conventional wisdom is simple: Illinois taxes are punishing, Arizona taxes are low, and retirees who move from one to the other save money. That narrative is incomplete — and for a specific profile of Illinois retiree, it is wrong.
Illinois imposes a 4.95% flat income tax on wages, capital gains, and investment income. But it exempts retirement income — Social Security, pensions, IRA distributions, 401(k) withdrawals — completely. Zero. Arizona imposes no such exemption. Arizona's 2.5% flat income tax (as of 2023) applies to all income including IRA and pension distributions. For retirees whose income comes primarily from retirement accounts, the state income tax picture flips: Illinois charges nothing and Arizona charges 2.5%.
The Trap in Plain Numbers
A retired Illinois couple drawing $120,000/year — $45,000 Social Security, $50,000 pension, $25,000 IRA withdrawal — pays:
- In Illinois: $0 state income tax (all retirement income is exempt)
- In Arizona: $3,000/year state income tax (2.5% on $120,000)
That $3,000/year — $30,000 over 10 years — is money Arizona collects that Illinois does not. The Arizona property tax savings on a $350K home are real (~$4,500–5,600 less per year than an equivalent Illinois home). But the net savings may be $1,500–2,600/year, not $4,500. Many retirees doing back-of-napkin math miss the income tax flip entirely.
The Full Side-by-Side Math — Three Scenarios
Scenario 1: Moderate Income, Similar Home Prices ($300K)
| Tax Item | Illinois (Kane Co.) | Arizona (Maricopa Co.) |
|---|---|---|
| State income tax on $80K retirement income | $0 | $2,000/yr |
| Property tax — $300K home | ~$7,200/yr | ~$1,800/yr |
| Total annual tax burden | ~$7,200 | ~$3,800 |
| Winner | Arizona saves ~$3,400/yr | |
At moderate income and comparable home prices, Arizona wins clearly. The property tax gap is wider than the income tax reversal.
Scenario 2: High Retirement Income ($160K/yr), Similar Home Prices ($350K)
| Tax Item | Illinois (DuPage Co.) | Arizona (Maricopa Co.) |
|---|---|---|
| State income tax on $160K retirement income | $0 | $4,000/yr |
| Property tax — $350K home | ~$7,000/yr | ~$2,100/yr |
| Total annual tax burden | ~$7,000 | ~$6,100 |
| Winner | Arizona saves ~$900/yr — nearly a wash | |
At $160K income and comparable home prices, the gap narrows dramatically. Arizona barely wins.
Scenario 3: Illinois Pension Recipient, High Income ($200K/yr), Modest Home ($280K)
| Tax Item | Illinois (McHenry Co.) | Arizona (Maricopa Co.) |
|---|---|---|
| State income tax on $200K retirement income | $0 | $5,000/yr |
| Property tax — $280K home | ~$6,160/yr | ~$1,680/yr |
| Total annual tax burden | ~$6,160 | ~$6,680 |
| Winner | Illinois wins by ~$520/yr | |
High income in a modestly priced Illinois home — Illinois wins. The income tax exemption's value exceeds the property tax gap.
The Illinois Pension Trap Specifically
This is the case nobody in the retirement relocation industry discusses: Illinois state pension recipients who move to Arizona discover that Arizona taxes their Illinois pension. Illinois pensions are exempt in Illinois — full stop. In Arizona, they are subject to Arizona's 2.5% flat tax.
A retired Illinois teacher drawing a $75,000 CTPF (Chicago Teachers Pension Fund) pension:
- Pays $0 Illinois income tax on that pension in Illinois
- Pays $1,875/year Arizona income tax on that pension if they move to Arizona
- Over 20 years: $37,500 in Arizona income tax on pension income that Illinois would never have collected
Where Arizona Definitely Wins
Arizona wins on total tax burden for most Illinois retirees who:
- Buy homes at comparable or lower price points to what they owned in Illinois
- Have moderate retirement income (under $120K/year)
- Are not receiving a large Illinois public pension
- Have flexibility on where they move (can choose lower-cost Arizona markets)
The property tax savings in Arizona are genuine and large. A $350K home in Maricopa County generates roughly $2,100/year in property tax. The same $350K home in Kane County, Illinois generates roughly $8,400/year. That $6,300 annual gap is real money and it compounds over time. Arizona's income tax at 2.5% narrows but typically does not eliminate that advantage at moderate income levels.
The Honest Bottom Line
Arizona wins for most Illinois retirees who buy at similar price points — but the margin is smaller than the "Illinois taxes are high" narrative suggests. For Illinois pensioners with high retirement income, the math is a genuine toss-up. For a narrow but real set of buyers — high retirement income, modest home price — Illinois can actually be cheaper.
Run your own numbers. Do not assume either answer. The correct inputs are: your specific retirement income sources and amounts, the specific home price you are comparing in each state, and the specific county in Illinois you are leaving (DuPage at 2.0% is different from Lake at 2.5%). The generic comparison produces the wrong answer for too many buyers.
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