Can I Afford to Live in Boston 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 | Boston MA | Rockford IL |
|---|---|---|
| Monthly take-home (est.) | $2,562 | $2,562 |
| 1BR rent | $3,000 | $1,050 |
| Groceries (est.) | $418 | $357 |
| Transport (est.) | $90 | $50 |
| Utilities | $185 | $158 |
| Internet | $70 | $58 |
| Left after essentials | -$1,201/month | $889/month |
Frequently asked questions
Is $40K a good salary in Boston?
At $40K/year in Boston, your estimated monthly take-home is $2,562. With 1BR rent around $3,000/month, rent takes up 117% of your take-home. That's considered difficult.
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 $-1,201/month in Boston.
Can I afford to live alone in Boston on $40K?
It's tight. Rent in Boston would take 117% 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