Jefferson Township Residential Property Tax Appeal — What Wins for Homes & Condos
Jefferson Township — much of Chicago's Northwest Side — was reassessed in 2024 as part of the City of Chicago's cycle, and isn't due again until 2027. But the value set in 2024 carries through the cycle, and you can appeal every year. In that reassessment, condos actually won more often than single-family homes — 33.3% versus 25.9%. Here's what the data shows, what wins, and how to file.
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The 60-Second Version
- Jefferson was reassessed in 2024 (City of Chicago cycle) and isn't due again until 2027 — but the value set in 2024 carries through the whole cycle.
- You can appeal every year, not just in reassessment years. If your value is too high, you can file in 2026 and 2027 too.
- Condos beat single-family homes: 33.3% of condo appeals won versus 25.9% for single-family — the reverse of the usual pattern.
- Homes won a $4,864 average cut; townhomes (Class 2-95) were the weak spot at 4.6%.
- Two levels of appeal each year: the Cook County Assessor first, then the independent Board of Review.
If you own a home or condo in Jefferson Township — Jefferson Park, Portage Park, Irving Park, Albany Park, Forest Glen, or North Park — the 2024 reassessment set a value that follows you until 2027. The good news: you don't have to live with it until then. Cook County lets you appeal every year, and the 2024 results show clearly which kinds of homes had the strongest case here.
01 · How your bill worksHow your tax bill is calculated
Every Cook County tax bill follows the same formula:
Residential property is assessed at 10% of the Assessor's estimated market value. An appeal targets that assessed value — if it's too high relative to comparable homes, a reduction lowers the taxable base that flows through the rest of the calculation. In a reassessment year like 2024, that value is freshly set and generally carries forward until the next reassessment, so getting it right matters for the whole cycle.
02 · What the data showsWhat the 2024 reassessment showed for homes & condos
Jefferson homeowners filed in large numbers in 2024. Single-family homes won 25.9% of appeals — but condominiums did better, at 33.3%. Here's how the main residential classes performed:
| Class | What it generally represents | Appeals | Success |
|---|---|---|---|
| 2-99 | Condominium | 13,750 | 33.3% |
| 2-03 | One-story home, 1,000–1,800 sq ft | 8,754 | 26.9% |
| 2-11 | Two- or three-flat (small residential) | 8,560 | 23.3% |
| 2-05 | One-story home (other) | 4,009 | 27.8% |
| 2-06 | Two-or-more story home (older) | 2,197 | 27.3% |
| 2-04 | Larger one-story home | 1,590 | 30.4% |
| 2-95 | Townhome / row house | 647 | 4.6% |
The pattern: condos (Class 2-99, the single largest group at nearly 14,000 appeals) led at 33.3%, and most house classes landed in the high-20s to low-30s. The clear weak spot was townhomes (Class 2-95) at just 4.6%.
03 · The reverse paradoxWhy condos beat houses here
In most Cook County townships, condos win less often than single-family homes — condo values are set consistently building-by-building, leaving little room to argue a single unit is mispriced. Jefferson flipped that: condos won 33.3% versus 25.9% for single-family homes. The 2024 reassessment appears to have moved condo valuations more readily than detached houses across the Northwest Side. The dollar cuts were still smaller for condos (about $2,147 on average versus $4,864 for homes), reflecting lower per-unit values — but on success rate, condo owners did better. The strongest condo cases still lean on sales within the same association and unit-specific differences (floor, view, condition).
04 · What winsWhat actually wins a Jefferson home appeal
Homes are valued mostly on comparable sales, so residential appeals are won on comparison — not on frustration with the bill. Three grounds carry the most weight:
- Lack of uniformity (the strongest residential argument). If comparable homes near you — similar size, age, style, and lot — are assessed for less per square foot than yours, your assessment is "non-uniform" and should be brought in line.
- Overvaluation. If recent sales of similar nearby homes — or a recent purchase or appraisal of your own home — come in below the Assessor's implied market value, you can argue the assessment overstates what your property is worth.
- Factual error in your record. Too much square footage, a finished basement that isn't finished, an incorrect unit or room count — correcting the record can lower the assessment on its own.
05 · What it's worthWhat a reduction is worth
Jefferson's composite tax rate runs around 6.6% — lower than the suburbs, as City of Chicago rates generally are. A reduction in assessed value translates into annual savings that repeat for as long as the lower value holds:
Illustrative estimate using Jefferson's state equalization factor and composite rate; excludes exemptions and varies by tax code.
06 · How to fileHow to file your Jefferson appeal
- Find your PIN and pull your assessment. Confirm the current value and the characteristics the Assessor has on record for your home, using your 14-digit Property Index Number.
- Check the calendar for Jefferson's window. Confirm the current-year "open" and "last file" dates on the Assessment & Appeal Calendar. Don't file before the township opens.
- Assemble your evidence. Comparable homes assessed for less, any recent sale or appraisal of your home, and photos or records correcting anything wrong in your property description.
- File online with the Assessor during Jefferson's open window, then again with the Board of Review — an independent body that opens after the Assessor's window, even if the Assessor reduced you only partially or not at all.
Confirm Jefferson's current-year dates on our deadlines page before you file.
07 · Where Jefferson standsYou can appeal every year — the 2026 window is open
Jefferson is a City of Chicago township, reassessed in 2024, so its values are generally set until the next reassessment in 2027. But the right to appeal isn't limited to reassessment years — Cook County lets you challenge your assessed value every year. Jefferson's 2026 Assessor appeal window runs from September 29 to November 12, 2026, and filing again is especially worth doing if you didn't appeal in 2024 or your result didn't go far enough. For the full township picture, see our Jefferson 2024 appeal results, or for income property, our Jefferson commercial guide.
See What Your Jefferson Home Could Save
Enter your address or PIN to compare your assessment against similar Jefferson Park, Portage Park and Irving Park properties and check your current appeal window — no upfront cost, you only pay if you save.
Check My AssessmentJefferson Residential Appeal FAQ
Can I appeal in Jefferson if it isn't a reassessment year?
Yes. Jefferson was last reassessed in 2024 and is next due in 2027, but Cook County allows an appeal every year. If your value is too high, you can file in the off-years — 2026 and 2027 — to correct the bills you haven't paid yet. Confirm Jefferson's current-year window before filing.
How did homes and condos do in Jefferson's 2024 reassessment?
Condos won 33.3% of appeals and single-family homes 25.9% — condos beat homes, the reverse of the usual pattern. Homes averaged about a $4,864 reduction in assessed value among winners (condos about $2,147). Townhomes (Class 2-95) were the weak spot at 4.6%.
Why did condos beat houses here?
The 2024 reassessment appears to have moved condo valuations more readily than detached houses across the Northwest Side. The dollar cuts were still smaller for condos, reflecting lower per-unit values, but on success rate condo owners did better. The strongest condo appeals use sales within the same association and unit-specific differences.
How much could a reduction save me?
Jefferson's composite tax rate runs around 6.6%. As a rough guide, a $5,000 cut in assessed value translates to roughly $1,000 a year, and it repeats for as long as the lower value holds. Estimates exclude exemptions and vary by tax code.
Does filing an appeal risk raising my taxes?
An appeal is a request to review your assessed value. If it isn't reduced, your assessment stays as it was. You can also pursue a separate, second-level appeal at the Board of Review after the Assessor.
Data & Sources
- Reassessment cycle: Jefferson Township (code 71) is a City of Chicago township, reassessed in 2024 (next 2027). Its 2026 Assessor appeal window runs September 29 to November 12, 2026 (the Assessor's calendar); annual appeals are available every year.
- 2024 residential results: Cook County Assessor Appeals dataset (Cook County Data Catalog), Jefferson Township, tax year 2024 — single-family (Class 2) 30,633 appeals, 25.9%, avg winning cut ~$4,864; condominium (2-99) 13,750 appeals, 33.3%, ~$2,147.
- Residential class detail (2024): condominium (2-99) 33.3% on 13,750; one-story 1,000–1,800 sq ft (2-03) 26.9% on 8,754; two-/three-flat (2-11) 23.3% on 8,560; one-story other (2-05) 27.8% on 4,009; older two-or-more story (2-06) 27.3% on 2,197; larger one-story (2-04) 30.4% on 1,590; townhome/row house (2-95) 4.6% on 647.
- Assessment level and formula: Illinois Property Tax Code — residential property assessed at 10% of market value; bill = (assessed value × state equalization factor − exemptions) × local tax rate.
- Tax-saving estimates use Jefferson's state equalization factor (3.0300 for the 2025 tax year) and a representative composite rate (~6.6%); estimates exclude exemptions and vary by tax code. Filing windows are set by the Cook County Assessor and Board of Review. All data is public and county-wide; no firm-specific results are stated.
Keep Reading
This article covers residential property tax appeals in Jefferson Township, Cook County, and is general information, not legal or tax advice. Results figures are drawn from public Cook County Assessor appeal data for tax year 2024 (reassessment); individual results depend on the property and the evidence presented. Tax-saving figures are estimates that exclude exemptions and vary by tax code. Filing windows are set by the Cook County Assessor and Board of Review and change through the year — always confirm your current deadline before filing. Representation is subject to a written engagement agreement.
