Can I Afford to Live in Rockford vs Boise 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 | Rockford IL | Boise ID |
|---|---|---|
| Monthly take-home (est.) | $2,562 | $2,535 |
| 1BR rent | $1,050 | $1,600 |
| Groceries (est.) | $357 | $372 |
| Transport (est.) | $50 | $45 |
| Utilities | $158 | $145 |
| Internet | $58 | $60 |
| Left after essentials | $889/month | $313/month |
Frequently asked questions
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.
Is $40K a good salary in Boise?
At $40K/year in Boise, your estimated monthly take-home is $2,535. With 1BR rent around $1,600/month, rent takes up 63% of your take-home. That's considered difficult.
Which city is more affordable on a $40K salary?
Rockford leaves you with more money after core expenses — $889/month vs $313/month in Boise.
Can I afford to live alone in Rockford on $40K?
It's tight. Rent in Rockford would take 41% 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