California vs Illinois Taxes
Compare the total tax burden between California (1% – 13.3%) and Illinois (4.95% flat). Enter your income to see which state saves you more.
Tax at Different Income Levels
| Income | California Total Tax | Illinois Total Tax | Annual Savings |
|---|---|---|---|
| $75,000 | $15,887 | $16,619 | +$733 |
| $100,000 | $25,477 | $25,269 | Save $207 |
| $150,000 | $45,570 | $43,187 | Save $2,382 |
| $200,000 | $64,563 | $60,006 | Save $4,557 |
Based on single filer, standard deduction, 2025 tax year. Includes federal income tax, state income tax, and FICA.
Why the difference
You'd save $207/year ($17/month) in Illinois vs California.
Tax structure
California uses progressive brackets up to 13.3%, while Illinois has a flat 5.0% state income tax.
Effective rate at your income
At $100,000, Illinois's effective state rate is 4.2% vs 4.4% in California — a 0.2 percentage point gap.
Tip: California's progressive brackets mean your effective rate is much lower than 13.3% for most earners. At $100,000, the effective state rate is approximately 5.8%. Consider maximizing 401(k) contributions and HSA to reduce California-taxable income.
Tip: The flat 4.95% rate means your effective state tax rate is close to 4.95% regardless of income — no progressive bracket benefit. Property taxes in Cook County (Chicago) can exceed $6,000-$10,000 on a median-value home.
Understanding Each State
California
California has the highest top marginal state tax rate in the US at 13.3%, with progressive brackets starting at 1%. An additional 1% Mental Health Services Tax applies to incomes over $1 million. Despite high taxes, California's economy — tech, entertainment, agriculture — attracts top talent globally. Under OBBBA (2025+), the SALT deduction cap rose to $40,000 ($20,000 MFS) but phases out $1-for-$1 above $500,000 MAGI ($250,000 MFS) toward a $10,000 floor — so high-income California itemizers see only partial federal relief.
Tip: California's progressive brackets mean your effective rate is much lower than 13.3% for most earners. At $100,000, the effective state rate is approximately 5.8%. Consider maximizing 401(k) contributions and HSA to reduce California-taxable income.
Illinois
Illinois has a flat income tax rate of 4.95% on all taxable income. While the rate is moderate compared to states like California or New York, Illinois's high property taxes (average ~2.08%, second-highest nationally) significantly increase the total tax burden, particularly for homeowners.
Tip: The flat 4.95% rate means your effective state tax rate is close to 4.95% regardless of income — no progressive bracket benefit. Property taxes in Cook County (Chicago) can exceed $6,000-$10,000 on a median-value home.
Key Comparison Points
Income tax structure: California has a progressive income tax (1% – 13.3%), while Illinois has a flat income tax (4.95% flat).
Beyond income tax: State tax comparisons should also consider property tax rates, sales tax, and cost of living. A state with no income tax may have higher property or sales taxes that offset the savings.
SALT deduction cap: Under OBBBA (2025+), the federal SALT cap is $40,000, phasing out above $500,000 MAGI toward a $10,000 floor. This limits the federal tax benefit of living in a high-tax state, so the gross state tax difference remains close to the net difference for most earners — especially high earners inside the phaseout.
Frequently asked questions
Is it cheaper to live in California or Illinois?
Based on income tax alone, Illinois has a lower tax burden. At $100K income, you'd save $207 annually in Illinois compared to California. However, total cost of living also depends on property taxes, sales taxes, and housing costs.
How much would I save moving from California to Illinois?
A single filer earning $100,000 would save approximately $207 per year in total taxes by living in Illinois instead of California. At $150,000 income, the savings change to $2,382 per year.
What is the income tax rate in California?
California has a progressive income tax with rates of 1% – 13.3%.
What is the income tax rate in Illinois?
Illinois has a flat income tax with rates of 4.95% flat.