Can I Afford to Live in San Diego vs Idaho Falls 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 | San Diego CA | Idaho Falls ID |
|---|---|---|
| Monthly take-home (est.) | $2,418 | $2,535 |
| 1BR rent | $2,600 | $1,100 |
| Groceries (est.) | $414 | $365 |
| Transport (est.) | $100 | $35 |
| Utilities | $130 | $142 |
| Internet | $65 | $65 |
| Left after essentials | -$891/month | $828/month |
Frequently asked questions
Is $40K a good salary in San Diego?
At $40K/year in San Diego, your estimated monthly take-home is $2,418. With 1BR rent around $2,600/month, rent takes up 108% of your take-home. That's considered difficult.
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.
Which city is more affordable on a $40K salary?
Idaho Falls leaves you with more money after core expenses — $828/month vs $-891/month in San Diego.
Can I afford to live alone in San Diego on $40K?
It's tight. Rent in San Diego would take 108% 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