Executive Tax Comparison: Illinois vs. Washington
When comparing individual income taxes between Illinois and Washington, Washington offers a distinct tax advantage. On an annual gross income of $100,000, a single taxpayer pays approximately $4,813 in Illinois state taxes versus $0 in Washington. Relocating to Washington would increase your net take-home pay by approximately $4,813 per year (around $329 extra per month).
Tax Structure & Brackets Comparison
- Illinois (flat): 4.95% flat rate. The standard deduction for single filers is $2,775.
- Washington (none): 0.0% (No state income tax). The standard deduction for single filers is $0.
Washington levies no individual state income tax, allowing employees and remote professionals to keep 100% of their non-federal earnings. By comparison, Illinois utilizes a flat tax structure.
Complete $100,000 Paycheck Breakdown
Your net paycheck is influenced not just by state income tax, but also by federal income tax (10% to 37% progressive brackets) and mandatory FICA payroll withholdings (6.2% Social Security up to wage cap + 1.45% Medicare).
- In Illinois, your estimated net annual take-home pay is $73,923 (effective total tax rate of 26.08%).
- In Washington, your estimated net annual take-home pay is $77,872 (effective total tax rate of 22.13%).
The Broader Picture: Sales & Property Taxes
Income tax is only one facet of overall tax burden. States with lower or zero income taxes frequently compensate via higher property assessments or sales taxes:
- Combined Sales Tax: Illinois averages 8.86% (state + local), compared to 9.38% in Washington.
- Effective Property Tax: Illinois homeowners experience an average effective property tax rate of 2.08%, versus 0.87% in Washington.
- Total Overall Tax Burden: According to Tax Foundation historical benchmarks, Illinois carries an overall tax burden of approximately 11.5%, while Washington averages 8.8%.
When evaluating a relocation between Illinois and Washington, homeowners must calculate whether property tax differentials balance out income tax savings.
Cost of Living & Housing Price Arbitrage
Earning money is only half the financial equation; what that money buys in local goods, services, and shelter defines your real standard of living:
- Cost of Living Index (COLI): Illinois registers an overall cost index of 91.8, compared to 115.1 in Washington (national average benchmark is 100.0).
- Typical Single-Family Home: Median home price in Illinois is approximately $265,000, versus $575,000 in Washington.
- Monthly Rental Rates: Typical median monthly rent runs $1,420 / mo in Illinois, compared to $1,880 / mo in Washington.
- Adjusted Purchasing Power: After adjusting your $100,000 gross salary's take-home pay for each state's local cost of living, your effective purchasing power equals $80,527 in Illinois versus $67,656 in Washington.
This means living in Illinois delivers a real purchasing power premium of approximately $12,871 per year in goods and housing affordability.
Relocation & Part-Year Tax Filing Considerations
If you move between Illinois and Washington during the tax calendar year, remember:
- Part-Year Residency Returns: You will likely need to file part-year resident returns in both states (or in the state with an income tax), allocating wages earned during your physical residency in each jurisdiction.
- Domicile Transition: Establish clear domicile evidence when arriving in your new state: update driver's licenses, register vehicles, sign leases or purchase deeds, and establish primary banking.
- Remote Work Sourcing: Some states enforce convenience of the employer rules. Verify with your HR department how payroll withholding will be transferred upon your move date.