Koh Samui real estate market — prices, rental yield and trend

• Average price: $1,945 / m²
• Gross rental yield: 10.46%
• Net rental yield: 10.11%
• Transaction cost: 7.5%
• Price basis: local-market average

Residential property in Koh Samui averages $1,945 per square metre. That makes it the 232nd most expensive of the 264 markets in the set.

What a buyer pays in Koh Samui

The $1,945 figure is a local-market average across all residential property types: a flat in a prime district sits well above it, an older unit on the edge of the market well below. Buying costs — transfer tax or stamp duty, notary, registration and agency — come to about 7.5% of the price here. On a 100 m² apartment at the average price that is roughly $14,589 on top of the $194,520 purchase price. That is below the 9.6% median across the set, which shortens the time it takes for a purchase to break even. That is 46.3% below the Thailand national average of $3,619. Among the other Thailand markets we track, Hua Hin at $1,828 is 6.4% cheaper.

What it earns

A square metre lets for about $17.0 a month. Against a purchase price of $1,945 per square metre that is 10.5% gross, before tax. Both figures come from the same source and the same period, so you can check the arithmetic yourself. It ranks 2nd of 311 markets by gross yield. Rental income is taxed at 0.9–15% — the rate is not a single number here. That is the difference between 8.9% and 10.4% net on the same property. The 10.1% net figure we publish uses 3.4%.

How the tax works. Progressive: a 30% lump-sum expense deduction for buildings, a THB 60,000 personal allowance and a THB 150,000 zero band (Revenue Code § 40(5), Royal Decree 11 § 5), then the progressive scale, which gives about 1–6% across typical rent levels. The upper end of 15% is the § 50(2) withholding, which is not final for a non-resident individual but becomes the effective burden if the owner never files a return. This is the weakest-supported figure in the set; local confirmation is advisable. Residential letting is VAT-exempt. Source: HLB Thailand.

Who can buy in Koh Samui

Condo freehold (49% cap); land not permitted. That is the rule a foreign buyer meets first, not legal advice — check the current position locally before you commit.

How this figure is built

The price figure for Koh Samui is built from asking prices from listings. It was last refreshed on 2026-10-17. We rate our confidence in this market’s data low — treat the figures as indicative and check them before acting. We recompute every market the same way, which is what lets Koh Samui be compared with a country average or another city.

Sources: Numbeo city page · numbeo.com · globalpropertyguide.com · api.frankfurter.dev. Snapshot: 2026-10-17.