Illinois senior freeze exemption: step-by-step application guide

Last updated 2026-07-11

What is the Illinois senior freeze exemption and how does it work?

The Senior Citizen Assessment Freeze Exemption freezes your home's Equalized Assessed Value (EAV) at the level it held the year you first qualified. It comes from 35 ILCS 200/15-172 ^[1]. Your market value can climb every year after that. Your EAV stays pinned to the base year, and you pay taxes only on that frozen number.

This is different from a flat dollar exemption. A flat exemption knocks a fixed amount off your EAV each year. The freeze protects you from assessment growth entirely, which is worth a lot more in a rising market. Cook County assessed values jumped hard in the 2021 reassessment, so a freeze set in 2020 could shield a homeowner from several years of compounding increases.

The freeze does not touch your tax rate. It does not freeze what your neighbors owe. If the overall levy in your district rises, your bill can still tick up. But the assessed value piece, the part you can actually influence through exemptions and appeals, is locked.

You have to qualify every year and refile every year. This trips people up. Miss one filing and you lose the freeze for that year. Most counties have no automatic renewal.

Who qualifies for the senior freeze exemption in Illinois?

Four requirements, all of them hard, all straight from 35 ILCS 200/15-172 ^[1]. You need age 65+, ownership and occupancy, household income of $65,000 or less, and continuous residency for the prior tax year.

Age comes first. You must be 65 or older as of January 1 of the tax year you are applying for. Turn 65 on January 2 and you wait until next year.

Ownership and occupancy come second. You must own the property (or hold a lease that makes you responsible for the taxes, like some life estates) and it has to be your principal residence. A rental, a vacation home, or a property you own but do not live in does not count.

Income is third, and it is the one that catches people. Your total household income for the prior calendar year must be $65,000 or less ^[1]. Household, more than yours. A spouse's income, rental income, pensions, Social Security, IRA distributions, all of it counts. The $65,000 ceiling has held since a 2017 increase from the older $55,000 level, so confirm the current figure with your assessor because the legislature can move it.

Continuous residency is fourth. The home had to be your principal residence for the whole prior tax year, with some exceptions for moves within the same county due to disability or health.

One nuance worth knowing: the freeze applies to the residential EAV, not the whole parcel if the parcel does other work. A home with a small farm attached gets the freeze on the residential portion only.

Requirement	Detail
Age	65+ as of January 1 of tax year
Residence	Principal residence, owned or qualifying lease
Household income	$65,000 or less for prior calendar year
Continuous occupancy	Full prior tax year at the property
Citizenship / status	Must be a legal Illinois resident

Source: 35 ILCS 200/15-172 ^[1]

What documents do you need to apply?

Pull your documents together before you sit down with the form and you save yourself a round of back-and-forth. Assessors typically want proof of age, proof of ownership and occupancy, income documentation, and your property index number. Some counties ask for more.

Proof of age: a copy of your driver's license, state ID, or birth certificate showing you were 65 or older as of January 1.

Proof of ownership and occupancy: most counties accept a copy of your recorded deed. If your home sits in a trust, bring the trust documents naming you as the beneficial owner. Renters who pay the taxes under a qualifying lease bring that lease.

Income documentation is the heavy part. Most counties want your prior-year federal return (Form 1040) plus schedules. If your income is below the federal filing threshold and you do not file, you will need an income affidavit or the state's income worksheet instead. Social Security benefit letters, pension award letters, and 1099-R forms often come along as backup ^[2].

Property index number (PIN): it is on your tax bill and on the county assessor's website. Having it ready saves time.

Some counties, Cook included, run an online portal that pre-fills ownership data from their records, so the deed may not be required in person. Bring it anyway. Systems have gaps.

Cook County processes more senior freeze applications than any other Illinois county by a wide margin, and its assessor's office publishes a document checklist ^[2]. Downstate, call your assessor first, because requirements vary county to county.

How do you fill out the senior freeze application form?

Illinois has no single statewide form. Each county assessor builds its own version, though they all collect the same statutory information. Cook County uses its own county-specific Senior Citizen Assessment Freeze Homestead Exemption application. Counties outside Cook use the state's PTAX-340 ^[2][3].

For non-Cook counties, the Illinois Department of Revenue publishes the PTAX-340 ^[3]. Download it from the IDOR site or pick it up at your township or county assessor's office.

Here is how a typical application moves.

Section 1 is property information: your PIN, property address, and the tax year. Match the tax year to what your county is currently accepting. You apply for a given tax year using the prior year's income, so the dates on the form can read as confusing.

Section 2 is applicant information: name, date of birth, and an attestation that you occupied the property as your principal residence.

Section 3 is income. List every source of household income for all adults in the home. That means wages, self-employment income, Social Security and SSI, railroad retirement, pensions, annuities, interest, dividends, rental income, capital gains, and alimony. The form totals these against the $65,000 threshold.

Section 4 is your signature and date. Both spouses sign if both are on the deed.

Attach copies, not originals, of your supporting documents. Keep a full copy of everything you send, the completed form included. Mailing it? Send it certified and keep the receipt.

What are the deadlines to file the senior freeze exemption in Illinois?

Miss the deadline and you lose the exemption for the whole tax year. For most counties the statute writes in no late-filing grace. Most Illinois counties set the deadline at July 1 of the assessment year; Cook County runs a later, township-based calendar that has landed in late July or early August ^[2][3].

Cook's deadlines shift with its township reassessment schedule. The 2024 deadline for most Cook County townships was in late summer, so the annual date is the one number you cannot assume ^[2].

The safe move: call your county assessor in late March or early April and ask for the current year's specific deadline. Most assessors post it on their websites by then.

County type	Typical deadline	Notes
Most Illinois counties (non-Cook)	July 1	Set by IDOR calendar [3]
Cook County	Late July or early August	Varies by reassessment year; check annually [2]

Newly 65 and applying for the first time? Your base-year EAV gets set at the EAV from the year before your first qualifying year. The assessor calculates this once you qualify.

If a disability or serious health problem keeps you from filing in person, many counties take mail applications or run outreach programs where a staffer comes to you. Ask your assessor before assuming you have to show up in person.

Where do you submit the application?

You submit to your county assessor's office, or in counties that use the township system, to your township assessor. Illinois has 102 counties. Most smaller downstate counties have a single county assessor's office. Cook County uses both a county assessor and township assessors, and in Cook the township assessor for your area handles the senior freeze ^[2].

To find your township assessor in Cook County, use the Cook County Assessor's website and enter your address ^[2]. Outside Cook, your county assessor is the single point of contact.

Some counties now take applications by mail, email, or online portal. Many still want a physical visit or at least a wet signature on the paper form before mailing. Do not assume online exists until you confirm it with your county.

Libraries, senior centers, and township offices often host free assistance days where assessor staff help people fill out the form. These usually run February through June. Check your county assessor's website or call 311 in Cook County for a schedule.

Managing this for an elderly parent who owns the property? You can submit for them with a signed power of attorney. Most counties want the POA document attached to the application.

What happens after you submit the application?

Processing time varies. Cook County, with its volume, can take several months before the exemption shows up on your bill. Smaller downstate counties often turn it around in a few weeks. Most assessors send no formal approval letter, so you watch your next tax bill instead.

When the freeze applies, the EAV on your bill matches your frozen base-year EAV rather than the current assessed value. The gap between what you would owe without the freeze and what you actually owe is your savings.

If the exemption never shows up, do not assume it was applied quietly. Call your assessor with your PIN and the year you applied. The application may have been missing a document, arrived after the deadline, or died from a clerical error. All fixable if you catch them before you pay the bill.

Cook County sends second installment bills, usually due late summer to early fall. If you filed on time but the exemption is missing from that bill, contact the assessor before paying. You can file a Certificate of Error to recover an exemption that was wrongly left off ^[10].

For future years, refile. Set a January calendar reminder to pull your documents, because the filing window opens early in the year.

Can you get the senior freeze exemption combined with other senior exemptions?

Yes, and you should. Illinois runs several property tax relief programs for seniors, and most stack on top of the freeze.

The Senior Citizens Homestead Exemption (35 ILCS 200/15-170) gives qualifying seniors an $8,000 EAV reduction on top of the standard homeowner's exemption ^[4]. Its income rules are loose (effectively no income cap), so almost every senior homeowner qualifies.

The Illinois Property Tax Credit, administered through the state income tax system by the Illinois Department of Revenue, helps homeowners recover a share of the property taxes they paid, and lower-income seniors often benefit most ^[5].

The Senior Citizens Real Estate Tax Deferral Program lets qualifying seniors defer their property taxes as a low-interest state loan instead of cutting the bill directly ^[6]. Its income limit is $65,000, same as the freeze.

In practice, a qualifying senior in Cook County might collect the standard homeowner's exemption (roughly $10,000 EAV reduction), the senior homestead exemption ($8,000 more), and the senior freeze on top. Each application is filed separately, though your assessor's office can usually hand you all the forms at once.

If your real problem is an assessment that is simply wrong (market value too high, more than growing too fast), that is an appeal, and it is a separate process from applying for exemptions. The Cook County tax assessor tax bill guide covers the Cook County appeal timeline in detail.

What if your application is denied?

Denials happen, and most are fixable. The usual reasons: income over $65,000, missing documentation, the property is not the applicant's principal residence, or a clerical mismatch between the application and county records. The county has to tell you the reason in writing.

Read the denial carefully. If the problem is fixable documentation (wrong year's tax return attached, an income calculation error, a missing spouse's signature), you can usually reapply with corrected documents before the deadline.

If you think the denial is wrong on the merits, you have the right to appeal. The appeal goes to the Property Tax Appeal Board (PTAB), an independent state agency ^[7]. PTAB hearings are administrative, and you can represent yourself. The deadline to file is generally 30 days from the date of the denial notice, but confirm it with PTAB directly because the timing rules are strict.

For income disputes, get precise about what counts. The statute defines household income broadly, but state rules exclude some items from the calculation. IDOR's PTAX-340 instructions walk the income definition line by line ^[3]. If a Social Security cost-of-living bump nudged your household just over $65,000, do the math carefully before you accept a denial.

One move that genuinely helps before reapplying or appealing: ask for a meeting with your assessor's office. Most offices will tell you exactly why you were denied and what document would cure it. It costs nothing and often solves the problem without a formal appeal.

How much money can the senior freeze actually save you?

The savings ride on two things: how fast your assessed value has been climbing and what your local tax rate is. No single dollar figure fits the whole state.

Here is a rough illustration. Say your EAV was $80,000 in 2020 when you first qualified. By 2024 the assessor has pushed it to $110,000. Without the freeze you pay on $110,000. With it, you pay on $80,000. At a combined local rate of 8%, that $30,000 EAV gap is worth $2,400 a year.

In high-value, fast-appreciating areas like parts of Cook County's north suburbs, the savings can run much higher. In flat markets the freeze does almost nothing, because the EAV was not growing anyway.

Nobody has published a clean statewide average that accounts for every variable. The closest usable data comes from individual county assessor reports, which vary widely by county and year. If you want a real number for your home, take your frozen EAV, subtract it from your current EAV, and multiply the difference by your local tax rate.

One thing to note: if your EAV ever drops below your frozen base-year EAV because the market fell, you automatically pay on the lower current EAV. The freeze sets a ceiling, not a floor. You always pay on whichever value is lower.

What about the senior freeze in Cook County specifically?

Cook County earns its own section. It is the largest county in Illinois by population, and its process has a few wrinkles the rest of the state does not share. The freeze is administered through the Cook County Assessor's Office and the township assessors, using a county-specific form rather than the statewide PTAX-340 ^[2].

In Cook the freeze is formally called the Senior Citizen Assessment Freeze Homestead Exemption.

Cook uses a triennial reassessment schedule. Chicago is reassessed every three years, and the suburbs sit in two other three-year cycles. Your base-year EAV is tied to when you first qualify, not to the reassessment cycle.

Here is the practical issue in Cook: because assessed values can jump sharply in a reassessment year, the gap between a senior's frozen EAV and the current EAV can grow large. That makes the freeze worth a great deal for longtime Cook County homeowners.

Cook also offers an online renewal option at the assessor's website for seniors who already have the exemption on file. That simplifies the annual refiling, though you still confirm your income is under the threshold each year.

If you also want to know whether the assessment itself is accurate (separate from the freeze), the Cook County tax assessor tax bill article walks through how to read your bill, check your assessment, and appeal if you need to. For contrast, senior exemptions interact with assessment appeals differently in high-value places like Santa Clara and Montgomery County, which run under their own state rules.

Should you hire a company to file this, or do it yourself?

You do not need to hire anyone to file the senior freeze exemption. It is a government form, it is free to file, and the assessor's office exists to help you complete it. Contingency firms that take a cut of your exemption savings are, in my view, a bad deal, because there is nothing they do that you cannot do with a few documents and an afternoon.

Professional help earns its keep in one place: appealing the underlying assessment, not filing for the exemption. A wrong assessment and a missing exemption are two separate problems with two separate fixes. If the market value on your assessment notice reads higher than what the home would actually sell for, that is an appeal, not an exemption application.

The appeal side is also very doable yourself. The TaxFightBack appeal kit gives you the comparable sales analysis, a form-by-form walkthrough, and hearing prep, so you keep 100% of any reduction instead of handing a third to a contingency firm. Even with no tool at all, the core evidence is public comparable sales data any homeowner can pull from county records.

For the freeze itself: file it yourself. The form takes 20 to 30 minutes if your documents are in order. Lean on your county assessor's office if you get stuck. It costs nothing.

Frequently asked questions

Do I have to apply for the Illinois senior freeze exemption every year?

Yes. The senior freeze exemption does not renew automatically in most Illinois counties. You file a new application each year to keep the freeze. Miss a year and you lose the exemption for that tax year, though you can reapply the next year. Some counties, Cook included, offer a simplified online renewal for existing recipients, but you still have to take action annually.

What counts as household income for the $65,000 limit?

Household income covers all adults living in the home, more than the applicant. It includes wages, self-employment income, Social Security benefits, railroad retirement, pensions, annuities, interest, dividends, rental income, capital gains, and alimony. The Illinois PTAX-340 instructions list every category. If your total across all these sources for the prior calendar year is $65,000 or less, you meet the income test.

What is the base year EAV and how is it calculated?

The base year EAV is your property's Equalized Assessed Value in the year before your first qualifying year. If you first qualify in 2024, your base EAV is typically the 2023 EAV. The assessor pulls this from their records; you do not calculate it. Going forward you pay taxes on whichever is lower, the frozen base EAV or the current assessed EAV.

Can a surviving spouse continue the senior freeze if the property owner dies?

Possibly. A surviving spouse who is at least 55 and who owned and occupied the property with the deceased senior can continue the freeze under 35 ILCS 200/15-172. The surviving spouse still has to meet the income requirement and must file an application in their own name. The freeze does not transfer automatically; the surviving spouse must apply.

Does the senior freeze exemption apply to condos and co-ops?

Yes, condominiums qualify as long as you own the unit and it is your principal residence. Co-ops have a more complex ownership structure, so eligibility depends on whether your interest counts as ownership under Illinois law. Contact your county assessor if you live in a co-op. Mobile homes on land you own can also qualify under certain conditions.

What if I move to a new home in Illinois after already having the freeze?

Moving resets the freeze. Sell your home, buy a new one, and you apply for the freeze on the new property, where a new base-year EAV gets set when you first qualify. You do not carry your old frozen EAV to the new address. Apply in your first full year of ownership and occupancy at the new home.

Is there an income limit for other Illinois senior property tax exemptions?

The Senior Homestead Exemption (an additional $8,000 EAV deduction) has no income limit; any senior who owns and occupies a home and is 65 or older qualifies. The Senior Freeze and the Senior Real Estate Tax Deferral Program both use the $65,000 household income ceiling. You can still get the Senior Homestead Exemption even if your income is too high for the freeze.

How do I find my property index number (PIN) to fill out the form?

Your PIN appears on your property tax bill, which comes from your county treasurer. You can also find it by searching your address on your county assessor's website. In Cook County, the assessor's online property search at cookcountyassessor.com lets you look up any address and pull the 14-digit PIN instantly. Have this number ready before you start the application.

Does the senior freeze exemption reduce the amount I owe on a tax bill that has already been sent?

If you were already entitled to the freeze but it never appeared on your bill, you may be able to correct it through a Certificate of Error with your county assessor. In Cook County, this process lets you claim exemptions omitted in prior years, typically going back up to three years. Contact your assessor's office promptly if you think an exemption was missed on a bill you already got.

What if my assessed value is lower than my frozen base-year EAV?

The freeze is a ceiling, not a floor. You always pay taxes on whichever EAV is lower, your current assessed value or your frozen base-year EAV. If the market falls and your current EAV drops below the frozen level, you automatically get the benefit of the lower current value. The freeze only kicks in as protection when your current EAV would otherwise run higher than the base.

Can I get a senior freeze exemption if my home is held in a trust?

Yes, as long as you are the beneficial owner of the trust and you occupy the property as your principal residence. Bring the trust documents to your assessor's office to show you hold the beneficial interest. Land trusts are common in Illinois, and assessors are generally used to processing applications for trust-held properties.

Where do I get the PTAX-340 form if I am in a county outside Cook?

The PTAX-340 is published by the Illinois Department of Revenue and is available on the IDOR website under property tax forms. You can also pick up a paper copy at your county or township assessor's office, many public libraries, and senior centers. Some counties use their own version that collects the same information; your assessor's office will give you the correct local one.

Is the senior freeze exemption the same as the senior homestead exemption?

No, they are two separate programs. The Senior Homestead Exemption gives all qualifying seniors a flat $8,000 EAV reduction each year regardless of whether values are rising. The Senior Freeze caps your EAV at a fixed base-year level, which can be worth far more in a rising market. Both come from different sections of 35 ILCS 200 and require separate applications.

What happens if I forget to refile and lose the freeze for one year?

You lose the exemption for that tax year and pay on the current assessed EAV instead of your frozen EAV. You can reapply the following year and the freeze comes back going forward, but you generally cannot recover the savings you lost by missing a filing year, except through the Certificate of Error process in limited cases. This is why an annual calendar reminder matters.

Sources

1. Illinois General Assembly, 35 ILCS 200 (Property Tax Code), Senior Citizens Assessment Freeze Homestead Exemption at Section 15-172: Statute authorizing the Illinois Senior Citizen Assessment Freeze Exemption, including eligibility requirements and $65,000 household income threshold
2. Cook County Assessor's Office, Exemptions section (Senior Freeze Exemption): Cook County application process, deadlines, and documentation requirements for the Senior Citizen Assessment Freeze Homestead Exemption
3. Illinois Department of Revenue, Property Tax forms including PTAX-340 Senior Citizens Assessment Freeze Homestead Exemption Application and instructions: PTAX-340 is the statewide form used by counties outside Cook for the senior freeze application; IDOR publishes the form and instructions including the income definition
4. Illinois General Assembly, 35 ILCS 200 (Property Tax Code), Senior Citizens Homestead Exemption at Section 15-170: Senior Homestead Exemption provides an additional $8,000 EAV reduction for qualifying seniors with no income cap
5. Illinois Department of Revenue, Individuals section, Property Tax Credit: Illinois income-tax-based property tax credit available to homeowners including lower-income seniors
6. Illinois General Assembly, 320 ILCS 30 (Senior Citizens Real Estate Tax Deferral Act): Senior Real Estate Tax Deferral Program allows qualifying seniors to defer property tax payments as a low-interest state loan; income limit $65,000
7. Illinois Property Tax Appeal Board (PTAB), official state agency website: PTAB is the independent state agency that hears appeals of exemption denials and assessment decisions; filing deadline is generally 30 days from the denial notice
8. Illinois General Assembly, 35 ILCS 200 (Property Tax Code), surviving spouse provision within Section 15-172: Surviving spouse who is at least 55 years old may continue the senior freeze exemption under specific conditions
9. Cook County Assessor's Office, Certificate of Error information: Cook County Certificate of Error process allows homeowners to claim omitted exemptions from prior tax years, typically up to three years back