Civil Engineer Salary in Illinois (2026)
The average Civil Engineer in Illinois earns around $98,000/year. After taxes, your estimated take-home is $73,719/year ($6,143/month).
Take-Home Pay Breakdown
| Category | Amount |
|---|---|
Annual Take-Home Pay | $73,719 |
Monthly Take-Home Pay | $6,143 |
Biweekly Take-Home Pay | $2,835 |
Hourly Take-Home Pay based on 2,080 hrs/year | $35/hr |
Federal Tax | $12,730 |
State Tax | $4,054 |
FICA Taxes | $7,497 |
Effective Tax Rate total taxes ÷ gross salary | 24.78% |
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Civil Engineer Salary Ranges in Illinois
Not all Civil Engineers earn the same — not even close
Illinois civil engineering splits between Chicago metro (Loop high-rise + IDOT D1 + CDOT + CTA + Metra + PWD Chicago lead-service-line replacement + suburban builder corridor), suburban Chicago (DuPage + Will + Lake + Kane consulting + commercial development + tech corridor), and downstate (Springfield IDOT HQ + Peoria Caterpillar adjacent + Quad Cities + Rockford + Champaign-Urbana). The IDFPR issues both PE (4 years post-EIT + state exam) and SE (Structural Engineer — additional 4 years post-PE + structural exam, required for high-occupancy / critical structures in IL — IL is one of ~10 SE-licensure states). Northwestern + UIUC + IIT + UChicago + Bradley + Notre Dame + SIU dominate the new-grad pipeline. Here's what each tier pays in 2026:
Senior IL Structural Engineer (SE License)
$140,000–$215,000+
IL SE specialty drives premium · Loop high-rise + critical structures · 10-state SE license
IDOT Senior Bridge / Transportation Engineer
$110,000–$165,000
IDOT D1 + bridge rehab + Tollway · IL SERS pension
Chicago Loop High-Rise Structural PE
$120,000–$180,000
Loop + River North + West Loop + Fulton Market structural · SOM Chicago + Magnusson Klemencic
PWD Chicago Lead-Service-Line + Water Resources
$110,000–$165,000
~400K LSL replacement program through 2076 · sustained specialty
Senior Project Manager (Engineering)
$130,000–$200,000
Megaproject management · Lincoln Yards + The 78 + CTA + Metra
Civil Engineer (Mid-Level, PE)
$90,000–$135,000
Most common mid-career band; PE required for stamping
Geotechnical Engineer (PE)
$100,000–$160,000
Foundation engineering for Loop high-rise + Lake Michigan adjacent geology
Construction Manager / CM Engineer
$105,000–$170,000
IDOT megaprojects + commercial buildout + CTA + Metra
Environmental Engineer
$90,000–$145,000
EPA Region 5 compliance + brownfield + Lake Michigan watershed
EIT / New Grad Engineer
$68,000–$92,000
First role; Northwestern + UIUC + IIT + UChicago + Bradley pipeline
Worth knowing: Illinois is one of only ~10 US states requiring the Structural Engineer (SE) license in addition to PE for high-occupancy + critical structures (others include CA, HI, NV, OR, WA, ID, UT). The IL SE license requires 4 additional years of structural engineering experience post-PE + the 16-hour SE exam — barrier creates a meaningful specialty premium. Senior IL SEs at SOM Chicago + MKA + Thornton Tomasetti + ARUP Chicago + KPFF clear $160K-$215K. PWD Chicago lead-service-line replacement (~400K LSLs through 2076) is the largest US LSL program by volume. Senior water resources at PWD + MWRD clear $130K-$170K with IL pension. IDOT D1 + Illinois Tollway bridge rehab + CTA + Metra round out public-agency tier.
OBBBA + FLSA exempt status, IL SE license premium, Chicago Loop high-rise, PWD lead-service-line, and Cook County property tax
4.95%
IL flat state income tax — IL conforms to federal AGI, OBBBA OT deduction flows through to state
~10 states
IL is one of only ~10 US states requiring SE license — meaningful structural specialty premium
2.1-2.4%
Cook County effective property tax — among highest US, eats Chicago homeowner math
Civil engineering classification splits by role. Senior PEs + SEs earning $100K+ on salary basis (the structural / bridge / water resources / transportation specialists at SOM + MKA + Thornton Tomasetti + ARUP + IDOT + PWD + CTA) typically meet the FLSA professional exemption (advanced learning + customarily acquired discretion) and don't get OT . EITs, field engineers, inspectors, CAD techs, and entry-level civil staff often qualify as FLSA non-exempt and accrue overtime — particularly during construction-season project deadlines on IDOT bridge rehab + CTA / Metra rail + Lincoln Yards / The 78 megaprojects when 50-60 hour weeks are routine.
The "No Tax on Overtime" deduction (federal, through 2028) lands cleanly for non-exempt civil engineering staff. Up to $12,500 (single) or $25,000 () of FLSA OT premium pay deducts from federal taxable income. Illinois conforms to federal AGI as the starting point for state taxable income, so the OBBBA federal OT deduction flows through to IL state automatically — savings of roughly $620/year single, $1,240 MFJ at the cap (4.95% IL flat). Chicago has no city wage tax (unlike Philly + Pittsburgh), so federal + state savings = full savings.
IL SE license is the structural specialty premium driver. IL is one of only ~10 US states requiring SE in addition to PE for high-occupancy + critical structures. SE license requires 4 additional years of structural engineering experience post-PE + the 16-hour SE exam (Building Structures + Bridges divisions). Once licensed, senior SEs at SOM Chicago + MKA + Thornton Tomasetti + ARUP + KPFF clear $160K-$215K. The license barrier is real and creates wage protection — most IL SEs work 8-12 years total before SE licensure, then the comp ramp accelerates.
Chicago Lead-Service-Line replacement program is the durable PWD + water resources specialty demand driver. ~400K LSLs targeted for replacement (largest US LSL program by volume), funded through 2076. Senior water resources + service-line + pipe support engineers at PWD + consulting firms (CDM Smith, Carollo, AECOM Chicago, Brown and Caldwell) clear $115K-$170K. Bipartisan Infrastructure Law (2021) accelerated funding through 2028.
Chicago Loop high-rise + Lincoln Yards / The 78 megaprojects + CTA + Metra rail rehabilitation create sustained Loop civil + structural demand. Major IL consulting firms include SOM Chicago (HQ, largest US structural engineering firm), MKA, Thornton Tomasetti, ARUP Chicago, KPFF, AECOM Chicago, HNTB. Senior Loop structural PEs + SEs clear $130K-$200K with IL flat tax.
Cook County property tax (2.1-2.4% effective) is the structural Chicago homeowner cost. On a $400K Chicago bungalow it's $8.4K-$9.6K/year — versus roughly $2.5K on the same house in suburban Phoenix or Charlotte. Long Term Senior Freeze and Senior Citizen Homestead Exemption help retirees, but working-age PEs carry the full bite. Most established Loop + IDOT senior PEs live suburban Cook (Tinley Park, Orland Park) or DuPage / Will County (Naperville, Joliet, Plainfield) for slightly lower property tax + more space.
Illinois for civil engineers — IL SE license premium, Loop high-rise, Lead-Service-Line replacement, Cook County property tax
Illinois has effectively two civil engineering markets. Chicago metro (Loop high-rise + IDOT D1 + CTA + Metra + PWD lead-service-line replacement + suburban builder corridor) operates at top US civil engineering scale + comp tier. Downstate (Springfield IDOT HQ + Peoria + Quad Cities + Rockford + Champaign-Urbana) operates on lower scales — closer to Iowa or Indiana wages than to Chicago. The Chicago vs downstate decision is the largest single financial fork available to an IL civil engineer.
Cost of living absorbs the Chicago wage premium fast. Cook County property tax (2.1-2.4% effective) is genuinely the harder tax for working IL PEs — on a $400K Chicago bungalow it's $8.4K-$9.6K/year, more than IL state income tax at senior PE comp. Most established Chicago senior PEs live suburban Cook (Tinley Park, Orland Park, Mokena) or DuPage / Will / Lake / Kane County (Naperville, Plainfield, Aurora, Joliet, Schaumburg, Arlington Heights, Vernon Hills) for slightly lower property tax + more space.
IL SE license + Chicago Loop high-rise specialty market is genuinely concentrated. SOM Chicago is HQ for the largest US structural engineering firm; combined with MKA + Thornton Tomasetti + ARUP + KPFF, the Chicago Loop structural specialty cluster is the deepest US after NYC. Lincoln Yards + The 78 megaprojects (Sterling Bay + Related Midwest) plus aging Loop building rehabilitation drive sustained demand. Senior SEs with IL license + 4 years post-PE experience are genuinely scarce + command premium.
Late-career relocation is a real pattern for senior IL civil engineers. Pritzker administration tax pressure + IL pension funding crisis + Chicago migration loss + Cook reassessment cycles drive significant outflow to FL, TN, NC, AZ, TX. Senior firm partners + IDOT pension retirees with $1M-$3M of business equity face 4.95% IL state on every realization event if they stay. Most pre-retirement relocators target Naples FL, Nashville TN, Asheville NC, or Phoenix AZ. IL SERS portable; document the move.
How Illinois taxes work for civil engineers (and where the levers are)
IL runs a flat 4.95% state income tax with $2,775 personal exemption (single, 2026). No itemized state deduction. A senior PE at $150K base pays roughly $7,350/year IL state. A senior IL SE at $200K pays roughly $9,890. Cook County property tax (2.1-2.4% effective) is genuinely the harder tax for working IL PEs — on a $450K Chicago bungalow it's $9.5K-$10.8K/year, exceeding IL state income tax at senior PE comp.
IL SERS (State Employees' Retirement System) is the structural IL public-agency civil engineer retirement architecture. IDOT, IL EPA, IL Department of Natural Resources, plus the Chicago Transit Authority (CTA) + Metra + Illinois Tollway all participate in IL SERS or the Chicago equivalent (CTRS for CTA, IMRF for IL municipal). IL SERS Tier 1 (pre-2011 hires) get 1.67% × years × final compensation. Tier 2 (post-2011) get reduced 1.67% × years × 8-year-average comp + age 67 retirement vs Tier 1's 60. A 30-year IDOT senior bridge engineer retiring at $145K final wages projects $58K-$72K/year pension for life, plus / accumulation typically $400K-$650K.
Private consulting senior PEs + SEs get the firm-partner / equity track. Major IL firms (SOM Chicago, MKA, Thornton Tomasetti, ARUP, KPFF, AECOM Chicago, HNTB, Stantec, WSP) offer associate / principal / partner tiers with profit-sharing + . Senior IL SE specialty principals at $200K+ comp + 25-30% profit-sharing pool + Section 199A 20% federal deduction (engineering not ) compound retirement assets to $1.5M-$3M+ across 25-year careers. IL conforms to QBI (no add-back).
election + Solo for IL shop-owner PEs at $200K+ net SE income — saves $5K-$12K/year SE tax. Illinois imposes a 1.5% Personal Property Replacement Tax (PPRT) on S-corp net income (paid by S-corp, not shareholder) — annoying but doesn't kill federal SE-tax savings. Solo 401(k) shelters $35K-$72K/year. Section 199A 20% federal deduction applies (engineering not SSTB). IL conforms to QBI — federal + IL combined savings.
- →IL SERS pension at IDOT / IL EPA / IL DNR / CTA / Metra / Illinois Tollway + deferred comp = strong IL public-agency civil engineer retirement architecture.
- →IL SE license at year 8-12 (4 years documented structural experience post-PE + 16-hour SE exam) — drives $30K-$50K wage premium above non-SE senior PE.
- →Chicago Loop high-rise specialty at SOM Chicago / MKA / Thornton Tomasetti / ARUP / KPFF — top IL structural tier $160K-$215K.
- → OT deduction up to $12,500 single / $25,000 for non-exempt EITs / inspectors. IL conforms federal + state — flows through to IL 4.95%.
- → election + Solo at $200K+ net SE for shop owners. Saves $5K-$12K/year SE tax + shelters $35K-$72K. IL 1.5% PPRT noted but federal SE savings dominate.
- →Section 199A 20% federal deduction (engineering not ). IL conforms — federal + state combined.
- →Late-career IL → FL / TN / NC / AZ relocation pre-realization for senior firm partners + pension retirees. Saves 4.95% on $300K-$1M shop sale + lifetime pension stream.
Three IL civil engineering markets — what each one looks like
IL civil engineer comp varies more by Chicago Loop vs suburban Chicago vs downstate than by job type, but the work mix differs sharply across the three submarkets.
Chicago Loop / North Side / West Loop — SOM Chicago + Loop high-rise + Lincoln Yards / The 78 + CTA / Metra
Mid-level PE $90K-$135K · senior IL SE structural $160K-$215K · firm partner $200K-$420KLargest IL civil engineering employer cluster + top US structural specialty market after NYC. SOM Chicago HQ (largest US structural engineering firm). Magnusson Klemencic Associates + Thornton Tomasetti + ARUP Chicago + KPFF + AECOM Chicago + HNTB Chicago. Lincoln Yards + The 78 megaprojects. Loop + River North + West Loop + Fulton Market high-rise (~280 million sq ft Class A office). PWD lead-service-line replacement (~400K LSLs through 2076). CTA + Metra rail engineering. IDOT D1 + Illinois Tollway.
Most Loop senior PEs live suburban Cook (Tinley Park, Orland Park) or DuPage / Will County (Naperville, Plainfield, Aurora). Cook County property tax 2.1-2.4% structural homeowner cost.
Suburban Chicago — Naperville + Aurora + Schaumburg + Vernon Hills + builder corridor + tech
Mid-level PE $85K-$130K · senior PE $115K-$170K · firm partner $170K-$300KDuPage + Will + Kane + McHenry + Lake counties — residential subdivision + light commercial + tech corridor (Nokia Naperville, Caterpillar Aurora HQ adjacent, Motorola Solutions Schaumburg, AbbVie North Chicago HQ). Less union density than Loop — IDFPR-licensed PE consulting firms dominate. Healthcare civil at Northwestern Medicine suburban hospitals + Advocate Aurora + Edward-Elmhurst. Lake County biotech adjacent (Abbott + AbbVie + Baxter + Walgreens HQ).
Most suburban Chicago PEs live Naperville / Plainfield / Aurora / Schaumburg / Vernon Hills / Lake Forest at $400K-$700K. Lower property-tax friction than Cook (1.4-2.0%).
Downstate IL — Springfield IDOT HQ + Peoria + Quad Cities + Rockford + Champaign-Urbana
Mid-level PE $75K-$110K · senior PE $105K-$140K · firm partner $140K-$220KSpringfield (IDOT HQ — largest IL civil engineering employer concentration + state government + state university). Peoria (Caterpillar HQ adjacent + UnityPoint Health + OSF Saint Francis). Quad Cities (Moline / East Moline / Davenport — John Deere agricultural equipment civil + Mississippi River infrastructure). Rockford (Rockford Health System + manufacturing + Chrysler Belvidere reach). Champaign-Urbana (UIUC + research medical). Bloomington (State Farm HQ + ISU).
Wages 30-40% below Chicago Loop but COL runs 50-60% lower. Cold-climate residential + boiler / hydronic specialty + heating-dominant demand makes downstate viable despite lower headline comp.
The Illinois civil engineer career arc — EIT to senior IL SE or IL SERS retirement
Years 1-4 (EIT). $68K-$92K. New-grad civil from Northwestern + UIUC + IIT + UChicago + Bradley + Notre Dame + SIU + ISU + Marquette + UW-Madison. EIT (Engineer-in-Training) status post-FE exam. Rotating assignments at consulting firm or public agency (IDOT, CTA, Metra, PWD, MWRD, Illinois Tollway, regional water/wastewater authorities). PE license pursuit at year 4 (4 years documented experience post-EIT + IDFPR state PE exam). Most IL civil EITs work 45-50 hour weeks during construction season; non-exempt at year 1-2.
Years 4-10 (mid-level PE). $90K-$135K. PE license achieved. Specialty cert track decisions: structural (IL SE pursuit at year 8-12 for high-occupancy + critical structures), bridge (IDOT bridge rehab specialty + AWS D1.5), geotechnical, water resources (PWD lead-service-line specialty), transportation, environmental. Mid-level PEs at consulting firms (SOM Chicago, MKA, Thornton Tomasetti, ARUP Chicago, KPFF, AECOM Chicago, HNTB, Stantec, WSP) or public agencies (IDOT, CTA, Metra, PWD, MWRD).
Years 8-15 (IL SE license / senior PE / specialty principal). $135K-$220K. IL SE license at year 8-12 (4 years documented structural experience post-PE + 16-hour SE exam) — drives $30K-$50K wage premium. Senior IL SEs at SOM Chicago + MKA + Thornton Tomasetti + ARUP + KPFF clear $160K-$215K. Senior IDOT bridge engineers + PWD water resources at $130K-$180K with IL SERS pension. Most Chicago senior SEs at this stage purchase suburban Cook / DuPage / Will County homes ($500K-$800K).
Years 15-25 (firm partner / agency senior management / late-career relocation). $200K-$420K+. Firm-partner tier at IL SE specialty firms (SOM Chicago, MKA — partner equity at $300K-$420K + profit-sharing). Agency senior management with IL SERS pension benefits ($150K-$200K + pension). Late-career IL → FL / TN / NC / AZ relocation pre-realization saves $30K-$80K cumulative state tax over 20-year retirement on IL SERS pension + realization. IL SERS pension portable; document the move; IL FTB-equivalent does pursue audits.
Where Illinois civil engineers actually live
Chicago civil engineers cluster in suburban Cook (Tinley Park, Orland Park, Mokena, $350K-$500K) for slightly lower property tax + traditional engineering family demographic, or DuPage / Will / Lake / Kane County (Naperville, Plainfield, Aurora, Schaumburg, Vernon Hills, $450K-$700K) for top-rated school districts + builder corridor demand. Downstate PEs in Springfield / Peoria / Quad Cities ($200K-$350K).
Tinley Park / Orland Park / Mokena (suburban Cook S/SW)
Traditional engineering family demographic · $350K-$500K SFH · 30-45 min Loop · Metra
Naperville / Plainfield / Aurora (DuPage / Will)
Top-rated school districts · $450K-$700K SFH · builder corridor + tech corridor
Schaumburg / Palatine / Arlington Heights (NW suburbs)
Motorola corridor · $400K-$650K SFH · Metra UP-NW commute to Loop
Vernon Hills / Lincolnshire / Buffalo Grove (Lake County)
AbbVie / Abbott / Baxter / Walgreens HQ · $500K-$800K SFH · top Lake County ISDs
Joliet / Lockport (Will County)
Cheaper SFH + driveway · $280K-$420K · 45-60 min Loop
Springfield / Peoria / Bloomington (downstate)
Cold-climate residential + IDOT HQ / Caterpillar / State Farm · $200K-$350K SFH
Cook County property tax (2.1-2.4% effective) is structural homeowner cost — suburban Cook + DuPage / Will / Lake / Kane runs 1.4-2.0% effective vs Chicago city 2.1-2.4%. Most established Chicago senior PEs made the suburban trade-off decades ago.
Is this the right move?
Illinois for civil engineers — IL SE license premium, Loop high-rise, Lead-Service-Line, OBBBA + 4.95% flat
Working in your favor
- +IL one of ~10 states requiring SE license — meaningful structural specialty premium ($30K-$50K)
- +SOM Chicago HQ + MKA + Thornton Tomasetti + ARUP + KPFF = top US structural specialty cluster after NYC
- +IL flat 4.95% income tax + AGI conformity = OBBBA OT deduction flows through to state
- +PWD lead-service-line replacement (~400K LSLs through 2076) = multi-decade water resources specialty
- +IL SERS pension at IDOT / CTA / Metra / Illinois Tollway = strong IL public-agency retirement
Worth knowing before you sign
- −Cook County property tax 2.1-2.4% effective — among highest US, eats Chicago homeowner math
- −IL pension funding crisis + Pritzker tax pressure drives senior outflow to FL/TN/NC
- −Brutal Q1 winters (Chicago Jan low ~17°F) slow construction-season project deadlines
- −IL SE license requires 8-12 years total (PE + 4 years documented + 16-hour SE exam) — slow career-entry
- −Downstate scale (Springfield / Peoria / Quad Cities) runs 30-40% below Chicago Loop
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