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Illinois Spousal Support Calculator
Illinois has formula for both amount and duration. One of most predictable states for spousal maintenance awards.
Spousal Support Calculator
Estimate potential alimony payments based on income disparity, marriage length, and other key factors. Results are estimates only and vary significantly by state.
Basic Information
Higher Earner
Lower Earner
Type of Support
Additional Factors
Estimated Spousal Support
Income Analysis
Post-Support Monthly Income
Higher Earner
Lower Earner
Applied Adjustments
- Increased for career sacrifice during marriage
Critical Disclaimer: This calculator provides rough estimates for educational purposes only using simplified formulas. Actual spousal support (alimony) varies dramatically by state (Illinois), with some states using formulas and others using factor-based approaches. Courts consider numerous factors including earning capacity, standard of living, contributions to marriage, age, health, and more. These calculations do NOT constitute legal advice. Consult with a family law attorney in Illinois for accurate analysis of your specific situation.
Illinois Spousal Maintenance
750 ILCS 5/504 governs. FORMULA for cases where combined gross under 500k annually no multiple families. Amount AND duration guidelines.
Formula
Amount: 33.33 percent payor net minus 25 percent recipient net. Total cannot exceed 40 percent combined net.
Example: A nets 6500 B nets 2500. Calculation: 6500 times 0.3333 minus 2500 times 0.25 equals 2167 minus 625 equals 1542. Check: (2500 plus 1542) divided by 9000 equals 44.9 percent exceeds 40 percent cap so reduce to 40 percent equals 1100 monthly.
Duration Guidelines
Under 5 years: 20 percent marriage. 5-10 years: 40 percent. 10-15 years: 60 percent. 15-20 years: 80 percent. 20 plus years: court determines often permanent.
Tax
Post-2018: NOT deductible NOT taxable. Illinois follows federal. State flat 4.95 percent.
Cost
Uncontested 2000-4000. Contested 8000-20000 plus. Chicago 300-500 per hour. Divorce.com 499-1999. Filing 289-388.
Frequently Asked Questions
Q: Formula? A: Yes for combined gross under 500k no multiple families.
Q: What formula? A: 33.33 percent minus 25 percent capped at 40 percent combined.
Q: Duration 7 years? A: 2.8 years or 40 percent of marriage per guidelines.
Q: Over 500k? A: No formula. Discretionary factors.
Q: Mandatory? A: Presumptive but judges can deviate if unjust.
Other Articles:
State Divorce Guides
City Divorce Guides
Divorce Cost in Aurora, IL: 2026 Price Breakdown & Attorney Fees
How Much Does Divorce Cost in Chicago, IL (2026 Guide)
How Much Does Divorce Cost in Elgin, IL? | 2026 Price Guide
Divorce Cost in Joliet, IL (2026 Guide)
Naperville Divorce Cost in Illinois: 2026 Price Breakdown
How Much Does Divorce Cost in Peoria, IL? | 2026 Price Guide
Divorce Cost in Rockford, IL (2026 Guide)
Divorce Lawyers in Aurora, IL - Free Consultations
Divorce Lawyers in Chicago, IL | Compare Attorneys
Divorce Lawyers in Elgin, IL | Compare Attorneys
Divorce Lawyers in Joliet, IL - Free Consultations
Divorce Lawyers in Naperville, IL - Free Consultations
Divorce Lawyers in Peoria, IL | Compare Attorneys
Divorce Lawyers in Rockford, IL - Free Consultations
How to File for Divorce Without a Lawyer in Aurora, IL (2026)
How to Divorce Without a Lawyer in Chicago | Step-by-Step 2026 Guide
How to Divorce Without a Lawyer in Elgin | Step-by-Step 2026 Guide
How to Divorce Without a Lawyer in Joliet, IL
How to Divorce Without a Lawyer in Naperville, IL
How to Divorce Without a Lawyer in Peoria | Step-by-Step 2026 Guide
How to Divorce Without a Lawyer in Rockford, IL
County Divorce Guides
RETAINER FEE
PETITION
COURT FILING FEE
SUMMONS
AFFIDAVIT
MOTIONS
ARGUMENTS
TEMPORARY ORDERS
HEARINGS
SUBPOENAS
DEPOSITIONS
SETTLEMENT
CONFERENCES
JUDGEMENT
TRIAL
APPEALS
Real Answers. Real Support.
We're here to guide you through every step of divorce — whether you're just starting to explore your options or ready to take the next step. Our blog offers expert insights, practical tips, and real-life stories to help you move forward with clarity and confidence.
Upfront pricing at a fraction of the cost of traditional divorce
Divorce doesn’t have to cost as much as a car.
Our Services
Paperwork Only
Basic access to divorce paperwork where you handle the rigorous filing process with the court.
POPULAR
We File For You
Our most popular package includes a dedicated case manager, automated court filing, spouse signature collection, and personalized documentation.
Fully Guided
Complete divorce support including mediation sessions, dedicated case management, court filing, and personalized documentation.
We've helped with
over 1 million divorces
We provide everything you need to get divorced — from conflict resolution to filing support and access to divorce experts — in one comprehensive, convenient online platform.
The team at divorce.com was responsive and helpful during a difficult process. I would highly recommend the site for uncomplicated, amicable divorces!!
Jen B.
I came across this online. So I checked on it. It was easy and affordable. I wish I would have found this years ago.
Brandy D.
I was able to read it easily. Thanks God for this service. I will recommend it to anyone who asks this is a very easy step to do. I love it please try it you won't be disappointed
Dianna R.
Great customer service. Questions were easy to answer and had descriptions to understand the questions.
Andelain R.
Proudly featured in these publications
The better way to get divorced.
Answer a few questions to see your personalized divorce options in under 3 minutes.
Illinois Spousal Support Calculator
Illinois has formula for both amount and duration. One of most predictable states for spousal maintenance awards.
Spousal Support Calculator
Estimate potential alimony payments based on income disparity, marriage length, and other key factors. Results are estimates only and vary significantly by state.
Basic Information
Higher Earner
Lower Earner
Type of Support
Additional Factors
Estimated Spousal Support
Income Analysis
Post-Support Monthly Income
Higher Earner
Lower Earner
Applied Adjustments
- Increased for career sacrifice during marriage
Critical Disclaimer: This calculator provides rough estimates for educational purposes only using simplified formulas. Actual spousal support (alimony) varies dramatically by state (Illinois), with some states using formulas and others using factor-based approaches. Courts consider numerous factors including earning capacity, standard of living, contributions to marriage, age, health, and more. These calculations do NOT constitute legal advice. Consult with a family law attorney in Illinois for accurate analysis of your specific situation.
Illinois Spousal Maintenance
750 ILCS 5/504 governs. FORMULA for cases where combined gross under 500k annually no multiple families. Amount AND duration guidelines.
Formula
Amount: 33.33 percent payor net minus 25 percent recipient net. Total cannot exceed 40 percent combined net.
Example: A nets 6500 B nets 2500. Calculation: 6500 times 0.3333 minus 2500 times 0.25 equals 2167 minus 625 equals 1542. Check: (2500 plus 1542) divided by 9000 equals 44.9 percent exceeds 40 percent cap so reduce to 40 percent equals 1100 monthly.
Duration Guidelines
Under 5 years: 20 percent marriage. 5-10 years: 40 percent. 10-15 years: 60 percent. 15-20 years: 80 percent. 20 plus years: court determines often permanent.
Tax
Post-2018: NOT deductible NOT taxable. Illinois follows federal. State flat 4.95 percent.
Cost
Uncontested 2000-4000. Contested 8000-20000 plus. Chicago 300-500 per hour. Divorce.com 499-1999. Filing 289-388.
Frequently Asked Questions
Q: Formula? A: Yes for combined gross under 500k no multiple families.
Q: What formula? A: 33.33 percent minus 25 percent capped at 40 percent combined.
Q: Duration 7 years? A: 2.8 years or 40 percent of marriage per guidelines.
Q: Over 500k? A: No formula. Discretionary factors.
Q: Mandatory? A: Presumptive but judges can deviate if unjust.
Related Guides
RETAINER FEE
PETITION
COURT FILING FEE
SUMMONS
AFFIDAVIT
MOTIONS
ARGUMENTS
TEMPORARY ORDERS
HEARINGS
SUBPOENAS
DEPOSITIONS
SETTLEMENT
CONFERENCES
JUDGEMENT
TRIAL
APPEALS
RETAINER FEE
PETITION
COURT FILING FEE
SUMMONS
AFFIDAVIT
MOTIONS
ARGUMENTS
TEMPORARY ORDERS
HEARINGS
SUBPOENAS
DEPOSITIONS
SETTLEMENT
CONFERENCES
JUDGEMENT
TRIAL
APPEALS
Other Articles:
State Divorce Guides
City Divorce Guides
Divorce Cost in Aurora, IL: 2026 Price Breakdown & Attorney Fees
How Much Does Divorce Cost in Chicago, IL (2026 Guide)
How Much Does Divorce Cost in Elgin, IL? | 2026 Price Guide
Divorce Cost in Joliet, IL (2026 Guide)
Naperville Divorce Cost in Illinois: 2026 Price Breakdown
How Much Does Divorce Cost in Peoria, IL? | 2026 Price Guide
Divorce Cost in Rockford, IL (2026 Guide)
Divorce Lawyers in Aurora, IL - Free Consultations
Divorce Lawyers in Chicago, IL | Compare Attorneys
Divorce Lawyers in Elgin, IL | Compare Attorneys
Divorce Lawyers in Joliet, IL - Free Consultations
Divorce Lawyers in Naperville, IL - Free Consultations
Divorce Lawyers in Peoria, IL | Compare Attorneys
Divorce Lawyers in Rockford, IL - Free Consultations
How to File for Divorce Without a Lawyer in Aurora, IL (2026)
How to Divorce Without a Lawyer in Chicago | Step-by-Step 2026 Guide
How to Divorce Without a Lawyer in Elgin | Step-by-Step 2026 Guide
How to Divorce Without a Lawyer in Joliet, IL
How to Divorce Without a Lawyer in Naperville, IL
How to Divorce Without a Lawyer in Peoria | Step-by-Step 2026 Guide
How to Divorce Without a Lawyer in Rockford, IL
County Divorce Guides
Upfront pricing at a fraction of the cost of traditional divorce
Divorce doesn’t have to cost as much as a car.
Real Answers. Real Support.
We're here to guide you through every step of divorce — whether you're just starting to explore your options or ready to take the next step. Our blog offers expert insights, practical tips, and real-life stories to help you move forward with clarity and confidence.
Our Services
Paperwork Only
Basic access to divorce paperwork where you handle the rigorous filing process with the court.
POPULAR
We File For You
Our most popular package includes a dedicated case manager, automated court filing, spouse signature collection, and personalized documentation.
Fully Guided
Complete divorce support including mediation sessions, dedicated case management, court filing, and personalized documentation.
We've helped with
over 1 million divorces
We provide everything you need to get divorced — from conflict resolution to filing support and access to divorce experts — in one comprehensive, convenient online platform.
The team at divorce.com was responsive and helpful during a difficult process. I would highly recommend the site for uncomplicated, amicable divorces!!
Jen B.
I came across this online. So I checked on it. It was easy and affordable. I wish I would have found this years ago.
Brandy D.
I was able to read it easily. Thanks God for this service. I will recommend it to anyone who asks this is a very easy step to do. I love it please try it you won't be disappointed
Dianna R.
Great customer service. Questions were easy to answer and had descriptions to understand the questions.
Andelain R.
Proudly featured in these publications