Can I Afford to Live in Naperville vs Rapid City 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 | Naperville IL | Rapid City SD |
|---|---|---|
| Monthly take-home (est.) | $2,562 | $2,728 |
| 1BR rent | $1,650 | $1,200 |
| Groceries (est.) | $380 | $365 |
| Transport (est.) | $72 | $40 |
| Utilities | $158 | $148 |
| Internet | $62 | $65 |
| Left after essentials | $240/month | $910/month |
Frequently asked questions
Is $40K a good salary in Naperville?
At $40K/year in Naperville, your estimated monthly take-home is $2,562. With 1BR rent around $1,650/month, rent takes up 64% of your take-home. That's considered difficult.
Is $40K a good salary in Rapid City?
At $40K/year in Rapid City, your estimated monthly take-home is $2,728. With 1BR rent around $1,200/month, rent takes up 44% of your take-home. That's considered tight.
Which city is more affordable on a $40K salary?
Rapid City leaves you with more money after core expenses — $910/month vs $240/month in Naperville.
Can I afford to live alone in Naperville on $40K?
It's tight. Rent in Naperville would take 64% 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