Can I Afford to Live in Koh Samui vs Santa Rosa 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 | Koh Samui TH | Santa Rosa CA |
|---|---|---|
| Monthly take-home (est.) | $2,728 | $2,418 |
| 1BR rent | $620 | $2,200 |
| Groceries (est.) | $380 | $410 |
| Transport (est.) | $150 | $72 |
| Utilities | $70 | $148 |
| Internet | $28 | $68 |
| Left after essentials | $1,480/month | -$480/month |
Frequently asked questions
Is $40K a good salary in Koh Samui?
At $40K/year in Koh Samui, your estimated monthly take-home is $2,728. With 1BR rent around $620/month, rent takes up 23% of your take-home. That's considered comfortable.
Is $40K a good salary in Santa Rosa?
At $40K/year in Santa Rosa, your estimated monthly take-home is $2,418. With 1BR rent around $2,200/month, rent takes up 91% of your take-home. That's considered difficult.
Which city is more affordable on a $40K salary?
Koh Samui leaves you with more money after core expenses — $1,480/month vs $-480/month in Santa Rosa.
Can I afford to live alone in Koh Samui on $40K?
Yes. At $40K in Koh Samui, rent takes 23% of your take-home, leaving $1,480/month after essentials. Most financial planners recommend keeping rent below 30%.
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