Montana
94
Purchasing power index · 100 = national avg
- COL index
- 105.9
- Median income
- 68,800 USD
- Sales tax
- ~0%
- Property tax
- ~0.61%
- Income tax
- Taxed
- $100k take-home
- $74,391
Back to calculator
US relocation · 2026
Montana → 
Illinois
At $100,000 gross, you’d need about $123,158 in Illinois to match Montana purchasing power — and same-gross take-home shifts by −$161/year.
By Sammy S. · Founder · AuthorUpdated for 2026
Stronger purchasing power
Illinois leads
COL index moves -10.8 from Montana (105.9) to Illinois (95.1). Median household income delta: +$9,000 (68,800 USD → 77,800 USD). At $100,000 gross (Billings → Chicago): equivalent salary ~$123,158; same-gross take-home −$161/year.
Side-by-side state scoreboard
Illinois
105
Purchasing power index · 100 = national avg
- COL index
- 95.1
- Median income
- 77,800 USD
- Sales tax
- ~8.98%
- Property tax
- ~1.88%
- Income tax
- Taxed
- $100k take-home
- $74,230
$100k example: Billings → Chicago
Single filer, tax year 2026. Equivalent salary adjusts for city cost of living; take-home uses our federal + state + payroll engine.
Equivalent gross needed
$123,158
+23.2% vs current
Take-home in Billings
$74,391
Take-home in Chicago (same gross)
$74,230
Same-gross delta
−$161
1BR rent: $950/mo → $1,810/mo
Housing: Billings → Chicago
Approximate median monthly rents for the primary metros in Montana and Illinois. Negative delta means housing is cheaper in Chicago. Figures are planning estimates — neighborhoods vary.
1BR rent delta / yr
+$10,320
1BR % of $100k (Billings)
11.4%
$950/mo
1BR % of $100k (Chicago)
21.7%
$1,810/mo
Property tax (effective)
~0.61% → ~1.88%
Montana → Illinois
At COL-equivalent salary in Chicago, 1BR rent is about 17.6% of gross — vs 21.7% if you keep $100,000 gross.
Apartment rent (monthly)
| Size | Billings | Chicago | Delta / mo |
|---|---|---|---|
| Studio | $780 | $1,550 | +$770 |
| 1 bedroom | $950 | $1,810 | +$860 |
| 2 bedroom | $1,180 | $2,200 | +$1,020 |
| 3 bedroom | $1,480 | $2,800 | +$1,320 |
House rent (monthly)
| Size | Billings | Chicago | Delta / mo |
|---|---|---|---|
| 2 bedroom | $1,280 | $2,300 | +$1,020 |
| 3 bedroom | $1,580 | $3,000 | +$1,420 |
| 4 bedroom | $1,980 | $3,700 | +$1,720 |
Buy instead? Est. mortgage (3BR house)
Billings payment
$1,816/mo
Chicago payment
$3,449/mo
Payment delta
+$1,632
Est. purchase price
$341,280 → $648,000
Illustrative P&I only: 20% down, 7% APR, 30-year fixed. Price ≈ annual rent × 18 (price-to-rent). Taxes, insurance, and HOA not included — open the calculator Housing section to adjust.
Sources: approximate metro medians (Zillow / Zumper-style US benchmarks; CMHC-style for Canada). Property tax rates are statewide effective averages. Personalize unit size, rent vs buy, and down payment in the relocation calculator.
Model housing for Billings → ChicagoMontana vs Illinois metrics
Highlighted cells favor the better figure for that metric (lower COL/unemployment, higher income/purchasing power, no state income tax).
| Metric | Montana | Illinois |
|---|---|---|
| Median household income | 68,800 USD | 77,800 USD |
| Cost of living index | 105.9 (100 = avg) | 95.1 (100 = avg) |
| Purchasing power | 94 | 105 |
| Combined sales tax | ~0% | ~8.98% |
| Effective property tax | ~0.61% | ~1.88% |
| Unemployment rate | 3% | 4.5% |
| Income growth (YoY) | 3.5% | 3.1% |
| State income tax | Yes | Yes |
Data: Census ACS / Statistics Canada; C2ER / StatCan cost of living. Purchasing power = 10,000 ÷ COL index. Sales and property rates are statewide averages.
Take-home by income
Same gross salary in both states — after federal tax, state income tax, and FICA. Advantage is take-home in Illinois minus Montana (single filer, standard deduction).
| Gross | Montana | Illinois | Advantage |
|---|---|---|---|
| $50,000 | $40,346 | $39,880 | −$466 |
| $75,000 | $58,216 | $57,880 | −$336 |
| $100,000Headline | $74,391 | $74,230 | −$161 |
| $150,000 | $106,177 | $106,366 | +$189 |
| $200,000 | $138,488 | $139,027 | +$539 |
At $100k: Montana keep ~$74,391; Illinois keep ~$74,230 (−$161). City COL can change equivalent salary even when state take-home is similar — use the scenario above for metro math.
City-to-city comparisons
Run the calculator for Montana → Illinois
Equivalent salary and after-tax take-home need specific metros. Pick a pair to pre-fill the relocation calculator, or open it blank.
Billings, MT → Chicago, ILBillings, MT → Naperville, ILBozeman, MT → Chicago, ILBozeman, MT → Naperville, IL
Open salary calculatorWhy compare salary when moving from Montana to Illinois?
Cost of living and state income tax differ between Montana and Illinois. Here's how equivalent salary and after-tax comparison work, and how to use the relocation calculator for your move.
Equivalent salary and cost of living
When you move from Montana to Illinois, the same gross salary can buy more or less depending on cost of living (housing, goods, services). An equivalent salary is the amount you'd need in Illinois to maintain the same standard of living as in Montana. Our relocation salary calculator uses cost-of-living indices for major cities in both states and shows the equivalent salary and after-tax take-home so you can compare real purchasing power.
State tax and after-tax take-home
State income tax varies: nine states have no state income tax (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming), while others use flat or progressive rates. So moving from Montana to Illinois can change your after-tax take-home even at the same gross. The calculator applies federal tax plus each state's tax so you see take-home in both places. For a detailed tax breakdown by state, use our US Tax Calculator and select Montana or Illinois.
How to compare Montana and Illinois
State pages summarize the move; numbers come from choosing specific cities.
- Pick a city pair. Use a linked city route above (or open the main relocation calculator) so the tool knows which metros to use for cost of living and taxes.
- Enter gross annual salary and filing status. The calculator applies federal and state taxes for each city.
- Review equivalent salary and take-home. See how much gross you may need in Illinois for similar purchasing power and how take-home compares at the same gross.
- Optional: housing and other costs. Expand Housing, Commute, Lifestyle, and moving costs for a fuller picture.
When you open the calculator and choose specific cities, numbers are produced with the methodology below.
Cost-of-living index
Each city has a relative index where 100 is that country’s national average. A value of 120 means the modeled basket is about 20% more expensive than average; 85 means about 15% cheaper. US city indexes are rounded composites aligned with the C2ER Cost of Living Index (urban areas). Statewide tables elsewhere on the site use MERIC averages of those urban areas. Canada cities use Statistics Canada–style relative indexes. Neighborhood costs can still differ from the metro composite.
Equivalent gross salary (“same lifestyle”)
We scale your gross by the ratio of destination to origin COL: equivalent gross = your gross × (COL_destination ÷ COL_origin). That answers: “What gross in the new city matches the same broad spending basket as my current city?”—before taxes are applied again in the new jurisdiction.
Percent change vs your current gross
change % = ((equivalent gross − your gross) ÷ your gross) × 100. Positive means you need a higher gross in the destination to match the COL gap; negative means a lower gross can suffice.
After-tax take-home
Take-home is annual gross minus income and payroll taxes for the filing status you select. We use the same calculateTax engine as our paycheck and state calculators, with tax rules for 2026, each city’s state or province, and payroll taxes (US: Social Security and Medicare; Canada: CPP and EI). Where we model them, local wage or city income taxes are included. We do not model every possible deduction (for example voluntary 401(k) or RRSP deferrals); treat take-home as a planning estimate.
- Take-home in your current city — taxes your gross as if you live in the origin metro.
- Take-home in the new city at the same gross — same gross income, but tax rules for the destination state or province (and locality if modeled).
- Take-home in the new city at the equivalent gross — taxes the COL-adjusted equivalent salary in the destination.
“Approx. combined tax + payroll burden” (preview tables)
Shown as an effective rate: ((gross − take-home) ÷ gross) × 100, rounded to one decimal. It summarizes income plus payroll taxes on that row’s gross; it is not a marginal bracket rate.
Purchasing power line (example snapshot)
After we compute take-home in the origin at the scenario gross and take-home in the destination at the equivalent gross, we express the relative change as a percent: how much higher or lower the destination take-home is versus the origin take-home at those two points. Small differences are normal because tax schedules are not a perfect mirror of the COL ratio.
Housing snapshot (rent and % of income)
When shown, rent comes from our city-level housing benchmarks for the selected unit type (for example average rent for a 1-bedroom apartment). Rent as % of gross is (monthly rent × 12) ÷ annual gross × 100 using the scenario gross or equivalent gross as labeled in the table. Neighborhoods and exact units vary; use the full calculator to align with your housing choice.
All of the above is for education and planning. Your employer, deductions, credits, and local costs can differ—see our disclaimer on this page or consult a qualified professional for advice specific to your situation.
Not sure what COL, equivalent salary, or take-home means? See the full glossary on the main relocation calculator.
Terms & definitionsFrequently asked questions
Common questions about salary comparison and relocation between Montana and Illinois.
At a $100,000 gross salary (Single filer, tax year 2026), maintaining purchasing power from Billings, MT to Chicago, IL typically requires about $123,158 gross in Illinois (+23.2% vs current). At the same $100,000 gross, take-home is about $74,391 in Billings, MT vs $74,230 in Chicago, IL (−$161/year). Pick your cities in the calculator for a personalized figure.
At $100,000 gross (single filer), estimated take-home is about $74,391 in Montana vs $74,230 in Illinois — a difference of −$161/year after federal tax, state income tax, and FICA. Sales tax averages ~0% in Montana vs ~8.98% in Illinois; effective property tax is ~0.61% vs ~1.88%.
Use the city-to-city links on this page to open the relocation calculator with a pair pre-selected (for example a city in Montana and a city in Illinois). You can also start from the main relocation calculator and choose any from/to cities.
For a 1-bedroom apartment in our sample metros (Billings, MT → Chicago, IL), estimated rent is about $950/mo vs $1,810/mo (+$10,320/year). That is roughly 11.4% of a $100,000 gross salary in Billings, MT vs 21.7% in Chicago, IL at the same gross. The Housing section on this page also lists studio–3BR apartments, 2–4BR house rents, an illustrative 3BR mortgage, and effective property tax (~0.61% → ~1.88%). Open the calculator Housing section to change unit size or model buying.
Indices are relative to the national average (100). Above 100 means more expensive than average; below 100 means cheaper. Your lifestyle and neighborhood still affect real spending.
Yes. At the same $100,000 gross, Illinois leave-home pay differs by about −$161/year vs Montana in our single-filer estimate. Use the equivalent-salary figure if you need to preserve spending power for a COLA discussion.
Enter annual gross salary. Convert hourly to annual first (for example hourly rate × hours per week × 52).
They are planning estimates: standard tax rules and indexed cost-of-living data. Actual withholding, deductions, rent, and policy changes can differ. Consult a tax professional for binding advice.
Related tools
Dig into taxes, rank all states, or flip the move direction.
Estimates for planning only. Cost-of-living indices and tax rules change; verify with local sources or a professional before relocating.