Illinois does not tax pension income, with a narrow exception for public employee pensions earned before 1984

Illinois has one of the most pension-friendly tax codes in the country. If you receive a pension from any source — a private employer, a union, the military, or a government job — that income is not subject to Illinois state income tax in nearly all cases. The exception is limited: only pensions earned by public employees (state, county, municipal, or school workers) for service before January 1, 1984 are taxable in Illinois.

This means most retirees with pensions pay no state income tax on those payments. If you worked for a private company, the federal government, or the military, your entire pension is exempt. If you worked for a public employer but started after 1983, your pension is also fully exempt. Only public employees with service credits earned in 1983 or earlier face any state tax on pension income.

Key Takeaways

  • Pensions from private employers, the military, and federal government jobs are completely exempt from Illinois state income tax.
  • Public employee pensions (state, county, municipal, school) earned after 1983 are fully exempt from Illinois state income tax.
  • Only public employee pension income earned before January 1, 1984 is subject to Illinois state income tax.
  • Federal income tax still applies to all pensions regardless of source — Illinois tax exemption does not affect your federal return.
  • You will still receive a 1099-R form from your pension provider, but you may not owe Illinois tax on the amount reported.

Who the exemption covers and who it does not

The Illinois pension tax exemption applies to you if you receive regular pension payments from a former employer. This includes defined-benefit pensions (a set monthly amount for life), lump-sum pension distributions, and survivor pensions paid to a spouse or dependent. The source of the pension does not matter for the exemption — only the date the service was earned.

If you worked for a private company, union, or any non-government employer, your pension is exempt no matter when you earned it or when you started receiving payments. If you worked for the federal government, the military, or the U.S. Postal Service, your pension is also fully exempt. If you worked for a state, county, municipal, or school employer and earned any service credit after December 31, 1983, that portion of your pension is exempt.

The only pensions that may be taxable are those earned by public employees entirely before 1984. If your public employee pension includes service from both before and after 1983, only the portion attributable to pre-1984 service is subject to tax. Your pension provider can tell you what portion, if any, falls into the taxable window.

The 1984 cutoff date and how it works

Illinois set January 1, 1984 as the dividing line in its pension tax code. This date was chosen to protect most public employees from state income tax on their pensions going forward. Any service credit earned on or after that date is exempt. Service earned before that date may be taxable.

If you are a public employee with a pension that includes service from both periods, your pension provider should be able to break down the taxable and non-taxable portions. You may see this on your 1099-R form as separate line items, or you may need to request a calculation from your pension administrator. The calculation is based on the ratio of pre-1984 service years to total service years, applied to your total pension payment.

For example, if you worked 10 years before 1984 and 20 years after 1984 for a public employer, one-third of your pension would potentially be subject to Illinois tax. However, you should verify this with your specific pension plan, as some public pensions have their own rules about how the cutoff applies.

Federal income tax still applies to all pensions

The Illinois state income tax exemption does not affect your federal income tax obligation. All pension income — regardless of source or when it was earned — is subject to federal income tax. You will owe federal tax on your entire pension payment each year.

When you start receiving pension payments, your pension provider will withhold federal income tax based on the W-4P form you complete. You can adjust your withholding at any time if you want more or less tax taken out. If you do not have enough tax withheld, you may owe when you file your federal return. If you have too much withheld, you will receive a refund.

How to report pension income on your Illinois tax return

You will receive a 1099-R form from your pension provider by January 31 each year. This form reports the total amount you received in pension payments. You must report this income on your federal return regardless of the Illinois exemption.

For your Illinois return, you report the same 1099-R income but then subtract the exempt portion. If your entire pension is exempt (which is the case for most retirees), you report the full amount on your Illinois return and then claim the full amount as an exemption. If only part of your pension is taxable (the pre-1984 public employee scenario), you report only the taxable portion as income.

Illinois Form IL-505 is the worksheet you use to calculate the exempt portion of a public employee pension. Your pension provider or a tax preparer can help you determine the correct amount to report. If you are unsure whether any of your pension is taxable, contact your pension administrator — they can provide a breakdown of taxable versus non-taxable service.

What happens if you receive a lump-sum pension payment

Some pension plans offer the option to take your entire pension as a single lump-sum payment instead of monthly checks for life. This payment is treated the same way as monthly pension payments under Illinois tax law. If the pension would be exempt as monthly payments, it is exempt as a lump sum. If part of it would be taxable, that same portion is taxable in the lump sum.

The 1099-R you receive will report the full lump-sum amount. You will owe federal income tax on the entire amount. For Illinois purposes, you subtract the exempt portion just as you would with monthly payments. Some people choose to roll a lump-sum pension into an IRA to defer taxes, but that decision affects federal tax, not Illinois tax.

Survivor pensions and benefits for spouses and dependents

If you receive a pension as the surviving spouse or dependent of a pension holder, that income is also covered by the Illinois exemption. Survivor pensions follow the same rules as the original retiree's pension — if the underlying pension would be exempt, the survivor benefit is exempt. If part of the original pension was taxable (pre-1984 public employee service), the same portion of the survivor benefit is taxable.

You will receive your own 1099-R form reporting the survivor benefit. Report it on your Illinois return using the same method as any other pension income. If you are unsure whether your survivor benefit includes any taxable portion, contact the pension plan administrator.

Frequently Asked Questions

Do I owe Illinois tax on my military pension?

No. Military pensions are fully exempt from Illinois state income tax. You will owe federal income tax on the amount, but you report it on your Illinois return and claim the full exemption. The same applies to federal employee pensions and U.S. Postal Service pensions.

I worked for a city for 5 years before 1984 and 15 years after. How much of my pension is taxable?

Only the portion earned before 1984 may be taxable. That is one-quarter of your pension (5 years out of 20 total). Contact your pension administrator to confirm the exact calculation, as some plans have specific rules about how the cutoff applies to your benefit.

What if I do not know whether my pension includes pre-1984 service?

Contact your pension plan administrator directly. They can tell you the exact breakdown of your service before and after 1984, and whether any portion of your pension is subject to Illinois tax. This information is usually available in your pension statement or by calling the plan's benefits office.

Does the Illinois pension exemption affect my Social Security taxes?

No. Social Security is a separate program with its own tax rules. The Illinois pension exemption applies only to pension income. Social Security benefits have their own federal tax rules and are not subject to Illinois state income tax.

Can I claim the pension exemption if I file my Illinois return electronically?

Yes. When you file electronically, you report your pension income the same way — the full amount on your return, then subtract the exempt portion using the appropriate line or worksheet. Your tax software should have a field for the pension exemption, or you can use Illinois Form IL-505 to calculate it.