Can I Afford to Live in Idaho Falls vs Rockford on $40K?
Here's how a $40K/year salary plays out in both cities after taxes, rent, and core living expenses — based on Q1 2026 data.
Monthly budget breakdown
| Expense | Idaho Falls ID | Rockford IL |
|---|---|---|
| Monthly take-home (est.) | $2,535 | $2,562 |
| 1BR rent | $1,100 | $1,050 |
| Groceries (est.) | $365 | $357 |
| Transport (est.) | $35 | $50 |
| Utilities | $142 | $158 |
| Internet | $65 | $58 |
| Left after essentials | $828/month | $889/month |
Frequently asked questions
Is $40K a good salary in Idaho Falls?
At $40K/year in Idaho Falls, your estimated monthly take-home is $2,535. With 1BR rent around $1,100/month, rent takes up 43% of your take-home. That's considered tight.
Is $40K a good salary in Rockford?
At $40K/year in Rockford, your estimated monthly take-home is $2,562. With 1BR rent around $1,050/month, rent takes up 41% of your take-home. That's considered tight.
Which city is more affordable on a $40K salary?
Rockford leaves you with more money after core expenses — $889/month vs $828/month in Idaho Falls.
Can I afford to live alone in Idaho Falls on $40K?
It's tight. Rent in Idaho Falls would take 43% of your $40K take-home pay. You may need to find roommates or look at studios to stay within the 30% rule.
See the full cost-of-living comparison
Rent, groceries, taxes, transportation, and more — side by side.
Take-home estimates use simplified federal/state brackets and do not account for pre-tax deductions, 401(k), or local taxes. Data: Zillow, BLS, Numbeo · Q1 2026 · For general guidance only