Illinois Retirement Income Tax Guide 2026

Illinois offers one of the most generous retirement income tax treatments of any state that still levies an income tax. Under the Illinois Income Tax Act, qualified retirement income — Social Security, government and private pensions, 401(k)/403(b)/457 distributions, IRA withdrawals, and several other categories — is subtracted from federal adjusted gross income before Illinois calculates state tax. Unlike states such as New York (capped at $20,000 for private pensions) or Michigan (capped at $65,987 single / $131,794 joint for 2026), Illinois places no dollar limit and no age requirement on the exemption. A retiree with a $200,000 pension pays exactly the same $0 in Illinois state tax on that pension as a retiree with a $20,000 pension.

This guide explains precisely what qualifies for the subtraction, the handful of income types that don't, Illinois's 4.95% flat rate on everything else, and how the numbers compare to a neighboring state that still taxes retirement income like ordinary wages.

Does Illinois Tax Retirement Income in 2026?

No — for the overwhelming majority of retirees, Illinois imposes $0 state income tax on retirement income. This isn't a special one-off deduction or a temporary phase-in like Michigan's Public Act 4; it's a long-standing subtraction built into the Illinois Income Tax Act and reported on Form IL-1040, Line 5. Illinois's own Department of Revenue guidance, Publication 120 (Retirement Income), confirms that qualifying retirement income is subtracted in full from federal adjusted gross income before Illinois tax is calculated.

The subtraction applies regardless of how large the retirement income is. A retired Illinois state trooper, a former private-sector executive with a $180,000 pension, and a retiree living entirely on Social Security all pay the same amount of Illinois state tax on that income: zero.

What Retirement Income Qualifies for the Illinois Subtraction

Per Illinois DOR Publication 120 and the IL-1040 instructions, the following federally taxed retirement income can be subtracted in full on Line 5:

Notably, Illinois's exemption extends to early distributions from qualified plans and IRAs — a detail some other states' rules don't cover — as long as the distribution was reported as taxable retirement income on the federal return.

What Doesn't Qualify: The Exceptions to Know

Illinois's exemption is broad but not unlimited. Publication 120 specifically excludes the following from the Line 5 subtraction:

• Non-qualified employee benefit plans. Deferred compensation and disability plans that are not government-sponsored (i.e., private-sector non-qualified deferred comp) do not qualify for the subtraction and remain taxable at 4.95%.
• Third-party sick pay. This is excluded even though it may appear on a 1099-R.
• Non-qualified 1099-R distributions coded as early/excess distributions from non-qualified plans (generally Box 7 codes D and F).
• Income that was never federally taxed. Only the federally taxable portion of retirement income is eligible for the subtraction — this is a mechanical limit, not a special exception, but it matters for partial after-tax IRA basis.

For the vast majority of retirees relying on Social Security, a standard pension, or a 401(k)/IRA, these exceptions rarely apply. They mainly affect retirees with private non-qualified deferred compensation arrangements or corporate executives with supplemental executive retirement plans (SERPs).

No Age Requirement, No Income Cap — How Illinois Compares

Most states that offer a retirement income break attach conditions: an age threshold, a dollar cap, or both. Illinois has neither.

This makes Illinois particularly attractive for retirees with large pensions — a category of retiree that capped-deduction states like Michigan or New York can't fully shelter from state tax.

Worked Example: Illinois vs. Wisconsin at $50k, $100k, and $200k

To see the exemption's real value, compare a single retiree with pension and IRA income living in Illinois versus Wisconsin — a neighboring state that, unlike Illinois, taxes most private pension and 401(k)/IRA income at its graduated rates (3.50%–7.65% for 2026), though it fully exempts Social Security and offers a new $24,000 (single) / $48,000 (married) retirement income subtraction for taxpayers age 67 and older.

Wisconsin's exact dollar liability depends on filing status, bracket thresholds for the tax year, and whether the age-67 subtraction applies — but at every income level shown, Wisconsin taxes at least some (and often all) of that pension/IRA income, while Illinois taxes none of it. For a retiree with a $200,000 pension, that's a difference of several thousand dollars a year, every year, for as long as retirement lasts. Use the Retirement Income Tax by State Calculator to run your own numbers against Wisconsin, Iowa, or any other state.

What Illinois Still Taxes: The 4.95% Flat Rate

The retirement income subtraction doesn't mean Illinois retirees pay zero state tax on everything. Illinois's 4.95% flat individual income tax still applies to:

• Wages or self-employment income from part-time or consulting work in retirement
• Interest, dividends, and capital gains earned in a regular (non-retirement) brokerage account
• Rental income
• Non-qualified deferred compensation and other income excluded from the Line 5 subtraction (see above)

So a retiree who draws a pension and also holds a taxable investment portfolio will pay $0 on the pension but will owe 4.95% on interest, dividends, and realized capital gains from that portfolio — the same rate that applies to every other type of Illinois taxable income, since Illinois has no separate lower rate for investment income.

The Trade-Off: Property Tax and Estate Tax

Illinois's income-tax generosity toward retirees comes with two offsetting costs worth planning around:

Property tax

Illinois has an effective property tax rate of approximately 1.88%, tied with New Jersey for the highest in the country. For a retiree who owns a home, high property tax bills can offset — or exceed — the income tax savings from the retirement income exemption, especially in Cook County and the collar counties. Renters and retirees who relocate to lower-property-tax parts of the state are less affected.

Illinois estate tax

Separately from income tax, Illinois imposes its own state estate tax on estates exceeding $4,000,000 per person — a threshold that, unlike the federal estate tax exemption, is fixed by statute and not adjusted for inflation. It is also not portable between spouses. Rates run up to 16% on the value above the exemption. This is a distinct tax from the income-tax treatment of retirement accounts and only matters for larger estates, but it's a factor high-net-worth retirees weighing Illinois against no-estate-tax states should model separately.