Sofia vs Koh Samui for Retirees (2026)
Scroll down for retirement income tax breakdown, healthcare estimates, and FAQ.
Full retirement cost breakdown
| Metric | Sofia Sofia City Province | Koh Samui Surat Thani Province |
|---|---|---|
| 1BR rent / month | $540Better | $620 |
| Median home price | — | — |
| State income tax | 10% | NoneBetter |
| Sales tax (combined) | 20% | 7%Better |
| Monthly utilities | $75 | $70Better |
| Groceries index (US = 100) | — | — |
| Est. healthcare / month | $240Better | $250 |
| Walk score (0–100) | 68 / 100Better | 35 / 100 |
| Overall COL index (100 = US avg) | 48Better | 50 |
Your biggest money opportunities based on this comparison.
Retirement tax savings
Koh Samui saves ~$417/mo on a $50K retirement income
Keep more of your fixed income. Park the tax savings in a high-yield account to let it compound.
While you're comparing — don't leave money on the table.
Mortgages
See what you can afford in Koh Samui
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Home & Auto Insurance
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New state means new rates. Lock in Koh Samui homeowners + auto quotes before your move date.
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Frequently asked questions
Which city is better for retirement — Sofia or Koh Samui?
Based on home prices, taxes on retirement income, walkability, and overall cost of living, Sofia scores better for retirees. Sofia is approximately 4% cheaper overall. The best choice still depends on climate, healthcare access, and proximity to family.
Is retirement income taxed in Sofia or Koh Samui?
Surat Thani Province has no state income tax, meaning Social Security, pension, and retirement account withdrawals are not subject to state tax. Sofia City Province has a 10% state income tax rate. For retirees, this difference can save thousands annually.
What is the estimated monthly healthcare cost in Sofia vs Koh Samui?
Based on national average retiree healthcare spending (~$500/month) scaled by each city's cost-of-living index, estimated monthly healthcare costs are approximately $240 in Sofia and $250 in Koh Samui. That's a difference of ~$10/month, or ~$120/year. Actual costs vary based on your Medicare plan, supplements, and health needs.
Can I afford to retire in Sofia on a $50,000 annual income?
On a $50,000/year ($4,167/month) retirement income in Sofia, rent alone would consume approximately 13% of your budget (1BR rent ~$540/mo) and healthcare another ~6%. That leaves roughly 81% (~$3,375/mo) for groceries, transportation, and other expenses. This is generally considered manageable.
Which city is more walkable for retirees?
Sofia has a higher walk score (68 vs 35 out of 100). Walkability is increasingly important for retirees who want to reduce car dependence — a score above 70 means most daily errands can be done on foot. Sofia offers more independence without a car, which also reduces transportation costs.
$50K/year in Sofia has the same purchasing power as $52K/year in Koh Samui
Healthcare estimates based on national avg retiree spending (~$500/mo) scaled by COL index · State income tax rates from Tax Foundation · Data: Zillow, BLS, Numbeo · Q1 2026