The True Cost of Buying a Villa in Koh Samui: Taxes, Fees & Hidden Expenses (2026)

Disclaimer: This guide is for informational purposes only and does not constitute financial or legal advice. Tax laws change regularly. Consult a qualified Thai tax advisor and property lawyer before making purchase decisions.

Introduction: The Purchase Price Is Just the Beginning

You have found the perfect villa on Koh Samui — sea views, private pool, lush gardens. The asking price looks compelling. Before you wire the funds, however, there is a figure that surprises virtually every first-time buyer in Thailand: the true total cost of acquisition is anywhere from 5% to 12% above the purchase price once every government tax, professional fee, setup cost, and ongoing expense is counted.

This is not a uniquely Thai problem. Every property market in the world layers transaction costs on top of the sticker price. What makes Thailand distinct — and what makes Koh Samui transactions in particular require careful planning — is the interplay of four overlapping tax regimes, ownership-structure choices that each carry their own fee set, and a tropical operating environment that demands continuous maintenance investment once you hold the keys.

This guide breaks down every single cost category with current 2025–2026 rates and works through two real-world examples: a THB 13 million villa purchase and a THB 8 million condominium. By the end, you will have a precise budget framework — not just the headline purchase price — before committing capital.

Part 1: Government Taxes and Fees at Transfer

All government fees and taxes are settled on the day of ownership transfer at the local Land Department office. They are calculated on the official Treasury-appraised value of the property or the declared sale price — whichever is higher. This is a critical detail: the appraised value set by the Treasury Department is updated every four years and may be lower or higher than the market price depending on location and property type.

Transfer Fee — 2% of Appraised Value

The transfer fee is the primary government levy for registering a change of ownership. According to Benoit & Partners Law Firm, the standard rate is 2% of the official appraised value.

Who pays: By law, this is the buyer’s responsibility, but in practice the fee is very commonly negotiated as a 50/50 split between buyer and seller in both Koh Samui and Phuket markets. Always confirm allocation in the Sale and Purchase Agreement before signing.

2025 Update: As of 22 April 2025, a ministerial regulation reduced the transfer fee to 0.01% for Thai citizens purchasing properties valued at or below THB 7 million, effective through 30 June 2026. This reduction does not apply to foreign buyers or properties above THB 7 million, so the standard 2% rate applies to the vast majority of international villa purchases on Koh Samui.

Specific Business Tax (SBT) — 3.3% if Owned Less Than 5 Years

The Specific Business Tax (SBT) is levied at 3.3% of the sale price or the appraised value — whichever is higher. The 3.3% figure comprises the 3% base SBT rate plus a 10% municipal surcharge on that amount (3% × 1.10 = 3.3%).

When it applies:

• The seller has owned the property for fewer than five years from the date of acquisition to the date of transfer
• The seller is a company (regardless of how long it has owned the property, since any company sale is treated as a commercial transaction)

Who pays: SBT is legally the seller’s obligation. However, in Koh Samui resale transactions it is common for the cost split to be negotiated as part of the overall deal price.

Why this matters to buyers: If you are purchasing from a developer or from a company-held villa, SBT will almost certainly apply. Ensure the seller’s SBT liability is explicitly addressed in your Sale and Purchase Agreement, because an ambiguous contract can result in a last-minute request for you to absorb this cost at the Land Office.

Withholding Tax — Progressive Scale for Individuals, 1% Flat for Companies

Withholding tax is Thailand’s equivalent of a capital gains tax mechanism, deducted at source on the day of transfer. The calculation differs depending on whether the seller is an individual or a company:

• Company seller: A flat 1% of the appraised value or sale price (whichever is higher)
• Individual seller: Calculated on a progressive scale using the appraised value, the number of years of ownership (which determines an allowable deduction percentage), and personal income tax brackets of 5%–35%. In practice, the Land Department’s simplified formula typically results in an effective rate of approximately 1%–3% of the appraised value for most individual sellers.

Who pays: This is the seller’s tax. It is withheld at the Land Office on the day of transfer and remitted directly to the Revenue Department.

Stamp Duty — 0.5% (Only When SBT Does Not Apply)

Stamp duty and SBT are mutually exclusive — you will never pay both on the same transaction. Stamp duty at 0.5% of the higher of the sale price or appraised value applies only when SBT is not charged — typically when an individual seller has held the property for more than five years.

Who pays: The seller, unless negotiated otherwise.

How Fees Are Typically Split in Koh Samui Practice

In practice, the Koh Samui market (like Phuket) has evolved a convention where total transfer costs are often shared. A typical split in a villa resale negotiation:

This means a buyer’s direct government fee exposure at transfer is typically 1% of the appraised value (their share of the transfer fee), though this is always subject to negotiation.

Part 2: Legal and Professional Fees

Lawyer Fees

Engaging an independent property lawyer is not legally mandatory in Thailand, but it is strongly advisable — particularly for international buyers unfamiliar with Thai land law. A qualified lawyer conducts title verification, reviews the Sale and Purchase Agreement, advises on ownership structure, and represents your interests at the Land Department.

Siam Legal International offers comprehensive due diligence and conveyancing services, with legal fees for property transactions typically ranging from THB 25,000 to THB 60,000 for standard transactions, depending on transaction complexity, the firm’s reputation, and the scope of services. Some firms charge on a percentage basis — approximately 1%–2% of the purchase price — for more complex transactions involving company structures or bespoke lease drafting.

For a Koh Samui villa transaction involving a Thai company ownership structure (the most common vehicle for foreign land ownership), total legal and company administration costs for the first year typically fall in the range of THB 150,000–THB 450,000, which includes lawyer fees, company formation, and the first year of accounting compliance.

Due Diligence Costs

Due diligence encompasses title deed verification at the Land Department, checking for encumbrances, liens, or easements, verifying building permits, and reviewing environmental and zoning restrictions. Benoit & Partners notes that a thorough real estate due diligence in Thailand should cover title deed review, land-use certificates, building permits, and outstanding tax liabilities — typically completed within 7–14 working days for standard transactions.

For a THB 13 million villa, expect to budget approximately THB 30,000–THB 50,000 for a thorough due diligence investigation covering title, permits, utilities connections, and ownership history.

A standard Land Department title search (to check the Chanote/title deed for encumbrances) costs a nominal government fee of a few hundred baht, but the professional time to interpret and act on findings is what drives the total.

Translation and Notarization

All Sale and Purchase Agreements in Thailand are legally executed in Thai. Translation costs typically run THB 100–300 per page. A 15–25 page purchase agreement and associated documents might cost THB 3,000–THB 8,000 to translate into your language.

Notarization of foreign documents (such as a foreign company’s authorization letter or power of attorney) incurs additional fees depending on the document type and whether apostille certification is required.

Budget: THB 5,000–THB 15,000

Thai Company Setup Costs (If Using a Thai Limited Company Structure)

Most foreigners who wish to hold land (as opposed to a condominium freehold) in Koh Samui do so through a Thai Limited Company. This is a legal structure where a Thai company — with at least 51% Thai shareholders — holds the title, and the foreign investor holds the remaining equity and/or a director position with control rights (often supported by a usufruct or superficies).

Initial company registration with professional services typically costs THB 18,000–THB 35,000 in government and legal fees, depending on registered capital and the scope of legal support. Nominee shareholder services — engaging professional Thai nominees to hold the majority shares — typically cost THB 20,000–THB 30,000 annually.

Annual compliance costs (ongoing): Thai companies must maintain annual accounts, file corporate income tax returns, and hold annual general meetings. Monthly accounting services range from THB 3,500–THB 17,000 per month, depending on transaction volume. An annual all-in accounting and compliance package for a simple holding company typically costs THB 30,000–THB 60,000 per year.

For a full comparison of ownership structures, see our guide: Koh Samui Property Ownership Structures Explained.

Part 3: Agent Commissions

In Thailand, real estate agent commissions are generally paid by the seller, not the buyer. The standard commission rate ranges from 3%–5% of the sale price, depending on the type of property and the listing agreement.

Buyers typically do not pay a direct commission in Thai property transactions — confirm this explicitly in your Sale and Purchase Agreement. The seller’s commission obligation is priced into the asking price, as in most international markets.

Sub-agent (co-broker) arrangements: When a buyer’s agent and a seller’s agent share a transaction, the total commission is split — but this split is between the agents, not an additional charge to the buyer.

Part 4: Ongoing Annual Costs

The purchase transaction is a one-time event. The ongoing cost structure of property ownership in Koh Samui is continuous and must be modelled accurately to assess true investment performance.

Land and Building Tax (Since 2020)

Thailand replaced its old property tax system with the Land and Building Tax Act B.E. 2562 (2019), effective from 1 January 2020. The annual tax is based on the Treasury’s appraised value and applied progressively within value bands. According to Siam Legal International and the Thai Revenue Department, the annual tax is collected by local administrative authorities each April.

Rates applicable to foreign investors and second homes:

Key point for foreign investors: The owner-occupied exemption (first THB 50 million tax-free) requires that the owner’s name appears in the house registration book (Tabien Baan) as of 1 January of the tax year, and applies only to individuals — not companies. As noted by Siam Legal, foreign investors holding a villa through a Thai company will not qualify for this exemption. Most foreign buyers will pay the “other residential” rate of 0.02%–0.10% annually — an extremely low burden compared to Western property markets.

For a villa with an appraised value of THB 10–30 million, the annual land and building tax under the “other residential” category equates to approximately THB 2,000–THB 6,000 per year.

Common Area Maintenance Fees (Condominiums)

For condominium purchases, monthly common area maintenance fees cover shared amenities (pool, gym, security, landscaping, elevators, lobby staff). In 2025, resort-market condo maintenance fees typically range from THB 25–THB 90 per square metre per month, depending on the development tier:

A one-time sinking fund contribution (for long-term capital repairs) is typically collected at purchase — commonly THB 500–THB 700 per sqm.

Property Management Fees (If Renting)

For villa owners who rent their property when not in personal use, professional property management is essential. According to Siam Legal’s property law resources, professional property management fees in Thailand’s resort markets typically range from 15%–20% of gross rental income, covering bookings, guest services, and general property oversight.

Platform commissions on booking channels (Airbnb, Booking.com) add a further 5%–10% of gross revenue, meaning total distribution and management costs can reach 20%–30% of gross rental income.

Insurance

Property insurance for a Koh Samui villa covers fire, water damage, typhoon/storm risk, and liability. Annual premiums typically run THB 15,000–THB 50,000, depending on the insured value, construction quality, and coverage scope. For a standard residential villa used occasionally and not rented full-time, budget approximately THB 12,000–THB 25,000 per year.

Utilities (Electricity, Water, Internet)

Koh Samui electricity rates are among the highest in Thailand due to the island’s separate grid status. Villas with heavy air-conditioning and pool pump usage typically see electricity bills of THB 8,000–THB 25,000 per month, with annual costs ranging from THB 96,000–THB 300,000 for luxury properties. A three-bedroom villa in regular personal use (not full-time rental) would typically average THB 6,000–THB 12,000 per month in electricity.

• Water: THB 100–300/month for municipal water (THB 5,000–THB 15,000/year)
• Internet (fibre, 1Gbps): Approximately THB 700–900/month
• Cable/satellite TV and phone: THB 10,000–THB 25,000/year

Pool and Garden Maintenance

Tropical conditions demand continuous attention. Annual pool maintenance (chemicals, cleaning, pump servicing) costs approximately THB 30,000–THB 60,000. Garden and landscaping upkeep runs THB 24,000–THB 72,000 per year, depending on garden size and complexity.

Pest Control and Security Systems

Annual pest control in a tropical climate typically costs THB 10,000–THB 25,000. Security system monitoring (CCTV, alarm systems) adds another THB 5,000–THB 15,000 per year.

Part 5: Lease-Specific Costs

For buyers acquiring a villa through a leasehold structure (30-year lease of the land, with freehold ownership of the building), the transfer-day fees are significantly lower than a full freehold purchase, but specific lease registration costs apply.

Under Thai law, as documented by Benoit & Partners, any lease exceeding three years must be registered at the Land Department. The registration fee is 1% of the total rent payable over the entire lease term, plus stamp duty of 0.1% — a combined 1.1%.

Example: A 30-year lease with a total declared lease consideration of THB 10 million:

• Lease registration fee: THB 100,000 (1%)
• Stamp duty: THB 10,000 (0.1%)
• Total: THB 110,000

Lease renewal costs: When the 30-year lease term expires and a new term is registered, the 1.1% fee applies again on the new term’s consideration. Budget for this in your long-term financial plan.

Lease amendment fees: Any amendment to a registered lease (change of lessee, term adjustment, rent modification) requires a new Land Department registration and associated fees. Budget THB 5,000–THB 15,000 per amendment in legal costs, plus applicable government fees.

For a full analysis of lease versus freehold structures, see: Koh Samui Property Ownership Structures Explained.

Part 6: Currency and Banking Costs

Foreign Exchange Transaction Form (FET)

This is one of the most frequently overlooked procedural requirements for foreign buyers. Thailand’s Land Department requires foreign nationals purchasing property to present a Foreign Exchange Transaction (FET) form — a document issued by a Thai bank confirming that the purchase funds were transferred from abroad in foreign currency and converted to Thai Baht in Thailand.

The FET is mandatory for:

• Foreign nationals purchasing condominium freehold
• Any transaction where the foreign source of funds must be evidenced

For transfers of USD 50,000 or more, the receiving Thai bank is required to prepare a formal FET certificate. For amounts below this threshold, a bank credit advice letter can serve the same purpose. Siam Legal International can collect the FET on behalf of the buyer and submit it to the Land Department.

Practical steps:

1. Open a Thai bank account before transferring funds
2. Transfer from your overseas account directly in foreign currency (USD, EUR, GBP, etc.)
3. Specify “property purchase” as the purpose of transfer
4. Request the FET certificate from your Thai bank after conversion

Without the FET, the Land Department will not register foreign ownership. This is not a negotiable step.

Foreign Exchange Spreads and Transfer Fees

International wire transfers carry two layers of cost:

• SWIFT/Telegraphic Transfer fee: Typically USD 25–USD 50 per transaction charged by your sending bank, plus any correspondent bank fees deducted in transit
• Foreign exchange spread: The difference between the mid-market rate and the rate your bank applies to the conversion. For a large transfer (e.g., USD 400,000 equivalent), a 0.5%–1.5% spread represents THB 60,000–THB 180,000 in cost versus the interbank rate

Practical tip: Specialist foreign exchange brokers — as opposed to retail bank wire transfers — often offer tighter spreads and flat transfer fees for large transactions, potentially saving several thousand USD on a villa-scale transfer. Compare rates from your bank against specialist FX services for large transfers, noting that only a licensed Thai bank can issue the FET certificate required for property registration.

Budget for FX costs: THB 15,000–THB 50,000 depending on transfer size and rate differential.

Part 7: Worked Example — THB 13 Million Villa Purchase

This example models a typical Koh Samui villa transaction: a THB 13 million three-bedroom leasehold villa acquired through a Thai Limited Company structure, where the seller is an individual who has owned the property for more than five years (meaning SBT does not apply; stamp duty applies instead).

Assumptions: Appraised value = THB 10 million; Sale price = THB 13 million. All taxes calculated on the higher of the two figures (THB 13 million). Transfer fee split 50/50.

One-Time Acquisition Costs

Note: If the seller has owned the property for fewer than five years (triggering SBT at 3.3%), the seller’s tax burden increases by approximately THB 364,000 but does not directly affect the buyer unless negotiated into the price.

Year-One Annual Running Costs (Owner-Occupier / Occasional Rental)

Year-One Total (Acquisition + First Year Running):

• Low estimate: THB 471,000 + THB 205,000 = THB 676,000 (~5.2% of purchase price)
• High estimate: THB 471,000 + THB 395,000 = THB 866,000 (~6.7% of purchase price)

Part 8: Worked Example — THB 8 Million Condominium Purchase

This models a foreign buyer purchasing a condominium unit in their own name (freehold, within the 49% foreign quota). The seller is a developer, so SBT applies. Transfer fee is split 50/50.

Assumptions: Appraised value = THB 7 million; Sale price = THB 8 million. Taxes calculated on the higher of the two (THB 8 million). Seller (developer) pays SBT and withholding tax; transfer fee split 50/50.

One-Time Acquisition Costs

Year-One Annual Running Costs (Condo, Occasional Rental)

Year-One Total (Acquisition + First Year Running):

• Low estimate: THB 194,000 + THB 84,400 = THB 278,400 (~3.5% of purchase price)
• High estimate: THB 194,000 + THB 144,200 = THB 338,200 (~4.2% of purchase price)

Part 9: Summary — Year-One Cost Table

Part 10: Tips to Minimize Costs Legally

1. Negotiate the transfer fee split before signing. The 2% transfer fee is almost always negotiable as a 50/50 split or better. In a buyer’s market or for motivated sellers, you may be able to shift more of this cost to the seller.

2. Time your purchase relative to the seller’s ownership period. If a seller has owned the property for just under five years, waiting (if feasible) until the five-year mark eliminates the 3.3% SBT, which can benefit the price negotiation significantly.

3. Use a specialist FX broker for large transfers. For villa-scale purchases, using a rate comparison service to optimize the foreign exchange conversion can save THB 20,000–THB 80,000 compared to a standard retail bank wire. Obtain the FET certificate from your Thai bank regardless.

4. Bundle company setup with annual compliance. Law firms and accounting practices that specialize in Thai company property holding structures often offer first-year packages that combine incorporation, compliance, and accounting at a lower combined cost than engaging separate providers.

5. Maintain the property as “residential use.” Ensure your property is assessed by the Land Department as residential rather than commercial or vacant — the tax rate difference is significant (0.02% vs. 0.30%+).

6. For condominiums, buy within the foreign quota directly. Purchasing a condo freehold in your own name is the most cost-efficient path for foreign buyers: no company setup costs, straightforward title, and no annual company accounting fees.

7. Conduct thorough due diligence on the title. The cost of discovering a title defect, encumbrance, or missing building permit after purchase vastly exceeds the cost of proper upfront due diligence. A full title and permit check by an independent property lawyer — such as those at Formichella & Sritawat or Siam Legal International — is non-negotiable for international buyers.

For a complete checklist of what to verify before you sign, see: Koh Samui Property Due Diligence Checklist.

Frequently Asked Questions

Q1: What is the total cost of buying a villa in Koh Samui on top of the purchase price?

For a typical villa transaction, budget an additional 3%–6% of the purchase price in one-time acquisition costs (buyer’s share of transfer fees, legal fees, due diligence, company setup if applicable, and FX costs). Year-one running costs add a further 2%–3% of the purchase price. Total first-year outlay above the purchase price typically falls in the range of 5%–9%, depending on ownership structure and whether you are renting the property.

Q2: Who pays property transfer taxes in Thailand — buyer or seller?

Most taxes are legally the seller’s obligation (Specific Business Tax, withholding tax, stamp duty). The transfer fee (2% of appraised value) is often split 50/50 by negotiation. However, nothing is fixed: all allocations should be explicitly documented in the Sale and Purchase Agreement before signing. In Koh Samui market practice, the buyer typically pays approximately 1%–1.5% of the appraised value in government fees.

Q3: How much is the annual property tax in Thailand for a foreign-owned villa?

Under the Land and Building Tax Act B.E. 2562 (2019), as confirmed by the Thai Revenue Department and summarised by Siam Legal International, a foreign investor’s holiday villa or rental property is taxed at 0.02% of the government appraised value for properties appraised at up to THB 50 million. This translates to approximately THB 2,000–THB 6,000 per year for a villa with a THB 10–30 million appraised value — extremely low by international standards.

Q4: What is the FET form and why does every foreign buyer need it?

The Foreign Exchange Transaction (FET) form is a document issued by your Thai bank confirming that the purchase funds were remitted from overseas in foreign currency and converted to Thai Baht in Thailand. The Land Department requires this document to register property under a foreign buyer’s name. Without an FET, the ownership transfer cannot be completed. Funds must be transferred from your overseas bank account, not from an existing Thai Baht account, to qualify.

Q5: What are the property management fees for a rental villa in Koh Samui?

Full-service property management in Koh Samui’s resort market typically charges 15%–20% of gross rental income, covering bookings, guest handling, and general property oversight. Add OTA platform commissions of 5%–10% for total distribution and management costs of 20%–30% of gross revenue. For a villa generating THB 1.5 million in annual gross rental revenue, budget THB 300,000–THB 450,000 in management and platform costs. For detailed yield analysis, see our guide on Koh Samui Rental Yields.

Q6: Are there additional costs for a leasehold villa versus freehold?

Leasehold structures carry a 1.1% lease registration fee (1% registration + 0.1% stamp duty) calculated on the total lease consideration, paid at the Land Department. This replaces the freehold transfer fee. If holding through a Thai company is not required, the leasehold route can be simpler and slightly cheaper at transfer. However, each 30-year renewal triggers the 1.1% fee again. See our full analysis in Koh Samui Property Ownership Structures Explained.

Q7: What hidden costs do buyers most often overlook?

The three most commonly underestimated costs are: (1) Company annual compliance fees — THB 30,000–THB 60,000/year for Thai company-held villas, which never disappear; (2) Tropical maintenance costs — pool, garden, pest control, and air-conditioning servicing add up to THB 60,000–THB 150,000/year even for a moderately sized villa; and (3) Foreign exchange costs — a 1% FX spread on a USD 400,000 equivalent transfer is a real USD 4,000 cost that most buyers do not plan for explicitly. The step-by-step process is covered in detail in our guide: How to Buy Property in Koh Samui.

Work With Samui Property Group

Understanding the full cost picture before you commit capital is the mark of a disciplined investor. At Samui Property Group, we work exclusively with buyers who want transparent, data-driven guidance — from initial property selection through due diligence, legal structuring, and beyond. SPG’s curated portfolio spans villas, condos, and land across every key Koh Samui neighborhood.

Contact Samui Property Group to discuss your investment goals. Our advisors will model the complete acquisition cost stack for any property you are evaluating, recommend qualified independent legal counsel, and guide you through every step of the process with the transparency this market demands.

Disclaimer: This guide is for informational purposes only and does not constitute financial or legal advice. Tax laws change regularly. Consult a qualified Thai tax advisor and property lawyer before making purchase decisions. All fee estimates reflect publicly available market data as of early 2026 and are subject to change. Always verify current rates with your legal advisor at the time of any transaction.

Related Articles

• Can Foreigners Buy Property in Koh Samui?
• How to Buy Property in Koh Samui: Step-by-Step Guide
• Koh Samui Property Ownership Structures Explained
• Koh Samui Property Due Diligence Checklist
• Koh Samui Rental Yields
• Thai Property Contracts Explained

Sources

• Thailand Property Transfer Fee — Benoit & Partners Law Firm (2025)
• Capital Gains Tax Thailand 2025 — Benoit & Partners Law Firm (2025)
• Real Estate Due Diligence in Thailand — Benoit & Partners Law Firm (2026)
• Property Transfer Taxes in Thailand — Siam Legal International
• Property Taxes in Thailand — Siam Legal International
• Transfer of Property in Thailand — Siam Legal International
• Transfer Money to Thailand for Property Purchase — Siam Legal International
• Due Diligence in Thailand — Siam Legal International
• Buying Property in Thailand in 2025 — Siam Legal International
• Real Estate Practice — Formichella & Sritawat, Attorneys at Law
• Thai Revenue Department — Land and Building Tax
• HLB Thai — Registration Fees for Property Transfers Reduced April 2025 (2025)
• Land and Building Tax — Thailand Law Online
• New Land and Building Tax Act — Tilleke & Gibbins (2020)
• Foreign Exchange Transaction Form — Wise Thailand (2025)