Can I Afford to Live in St. Louis vs Boulder 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 | St. Louis MO | Boulder CO |
|---|---|---|
| Monthly take-home (est.) | $2,572 | $2,582 |
| 1BR rent | $1,300 | $2,300 |
| Groceries (est.) | $369 | $414 |
| Transport (est.) | $75 | $80 |
| Utilities | $162 | $138 |
| Internet | $60 | $68 |
| Left after essentials | $606/month | -$418/month |
Frequently asked questions
Is $40K a good salary in St. Louis?
At $40K/year in St. Louis, your estimated monthly take-home is $2,572. With 1BR rent around $1,300/month, rent takes up 51% of your take-home. That's considered difficult.
Is $40K a good salary in Boulder?
At $40K/year in Boulder, your estimated monthly take-home is $2,582. With 1BR rent around $2,300/month, rent takes up 89% of your take-home. That's considered difficult.
Which city is more affordable on a $40K salary?
St. Louis leaves you with more money after core expenses — $606/month vs $-418/month in Boulder.
Can I afford to live alone in St. Louis on $40K?
It's tight. Rent in St. Louis would take 51% 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