Rental guarantee programmes in Phuket are typically marketed at 5-7% gross per year over a 3-5 year period, calculated on the purchase price. On paper that looks solid. Once we break the numbers down, however, the effective net return frequently lands at roughly half the advertised figure. Our analysts have been tracking guarantee contract structures offered to international buyers since 2019 and consistently see the same mechanisms eroding actual owner income.

As of 2026, the average asking price for a new condotel-segment apartment in the Bang Tao area sits at an estimated 5.8-7.2 million THB (roughly USD 160,000-200,000 at Q1 2026 exchange rates). A developer advertising a 6% annual guarantee over five years implies a nominal 348,000-432,000 THB in gross annual income. Below we walk through how much of that actually reaches the owner after accounting for costs that never appear in a brochure.

Quick answer

  • Rental guarantee schemes in Phuket typically offer 5-7% gross annually on the sale price, not on independent market value
  • Units sold with a guarantee are frequently priced 10-20% above comparable units without a programme - that premium is effectively a pre-funded subsidy for the guarantee payments
  • Annual owner-side costs (common area fee, sinking fund, insurance, withholding tax) consume roughly 40,000-80,000 THB for a typical 35-45 m² apartment
  • After the guarantee period expires, occupancy in low-season areas such as Rawai and Nai Harn drops to 30-40% from May through October
  • Net of costs and taxes, owners in our data sets receive a real return of 3.5-4.8% rather than the advertised 6-7%
  • Guarantee contracts commonly restrict owner personal use to 14-30 days per year, almost always limited to the low season

Options and scenarios

Scenario 1: Rental guarantee

The developer or an affiliated operating company commits to paying a fixed sum regardless of actual occupancy. The source of those funds is usually the margin embedded in the sale price. We verify this with a straightforward comparison: if an identical unit without a guarantee sells for 5.5 million THB, but the guaranteed version is priced at 6.5 million THB, the 1 million THB gap covers a substantial portion of the guarantee payments across the first few years.

Full example calculation for a 6.5 million THB unit with a 6% annual guarantee over five years:

  • Gross annual income (guarantee): 390,000 THB
  • Common area fee (55 THB/m2 x 40 m2 x 12 months): -26,400 THB
  • Sinking fund (annual contribution): -8,000 THB
  • Unit insurance: -4,500 THB
  • Withholding tax (flat-rate deducted at source, approximately 5% of gross income): -19,500 THB
  • Owner net: 331,600 THB, equivalent to 5.1% on the purchase price
  • Measured against the market value without the guarantee (5.5 million THB), the yield rises to 6.03% - but the investor has locked up an extra 1 million THB to get there

After five years the guarantee lapses and the unit generates market-rate income dependent on seasonality and location.

Scenario 2: Rental pool

All units in the building contribute to a shared pool; revenue is distributed in proportion to floor area or ownership share. The operator retains 25-35% of gross revenue as a management fee. Additional line items include housekeeping (300-600 THB per stay), laundry, minor repairs, and OTA commissions (Booking.com, Agoda - averaging 15-18% of the booking value).

Using the same 40 m2 unit in Bang Tao, with an annual average occupancy of 65% and an ADR (average daily rate) of 3,200 THB - figures drawn from our 2025 monitoring data:

  • Gross revenue: 365 days x 65% x 3,200 THB = 759,200 THB
  • OTA commission (16% average): -121,472 THB
  • Operator fee (30% of post-OTA net): -191,318 THB
  • Housekeeping (estimated 180 stays x 450 THB): -81,000 THB
  • Common area fee + sinking fund: -34,400 THB
  • Minor repairs, laundry, shared utilities: -24,000 THB
  • Withholding tax (5% of gross): -37,960 THB
  • Owner net: 269,050 THB, equivalent to 4.14% on a 6.5 million THB purchase price

The rental pool produces a lower result in this example, but it does not contain a hidden price premium. In a strong season it can outperform a guarantee that is simply returning the buyer's own money.

Scenario 3: Independent management with a specialist operator

The owner contracts a property management firm that charges 15-20% of net revenue (after OTA commissions). The owner retains control over pricing, can block dates for personal use, and selects distribution channels. This model requires active oversight, but eliminates the pool revenue split.

Using identical assumptions but with an operator fee of 18% instead of 30%:

  • Owner net after all costs: approximately 340,000-360,000 THB, or 5.2-5.5% per year

This is the highest-yielding scenario in our modelling, but it demands genuine market knowledge and ongoing attention.

Comparison table

Parameter Rental guarantee Rental pool Independent management
Operator cost to owner Embedded in purchase price (10-20% premium) 25-35% of gross post-OTA revenue 15-20% of net post-OTA revenue
Annual gross revenue (40 m2, Bang Tao example) 390,000 THB (fixed guarantee) 759,200 THB (at 65% occupancy) 759,200 THB (at 65% occupancy)
Owner net after costs and taxes approx. 331,600 THB approx. 269,050 THB approx. 340,000-360,000 THB
Effective net yield on purchase price 5.1% 4.1% 5.2-5.5%
Owner pricing control None Minimal Full
Personal use allowance 14-30 days per year (low season only) Restricted (deducted from pool share) No restriction
Risk after contract expiry Occupancy drop, no further guarantee Continued pool dependency Requires active management
Hotel licence requirement Yes (developer provides) Yes (operator provides) Yes (owner/building obligation)

Hotel licence and short-term rentals - the hard constraint

Thai law (Hotel Act B.E. 2547) classifies any rental of less than 30 days as hotel-type accommodation, requiring a formal licence. The building must meet fire-safety standards, maintain a reception facility, and obtain approval from local authorities. In practice this means that not every condominium in Phuket or Koh Samui can legally rotate guests on a nightly or weekly basis.

We monitor the enforcement situation continuously. In 2025, Phuket authorities intensified inspections of unlicensed accommodation operations and imposed fines of up to 20,000 THB per day. Before committing to a purchase, buyers must verify that the building holds a valid hotel licence or registered serviced-apartment status. Without one, the only legally available model is monthly rental (minimum 30-day stays), which substantially changes the revenue profile.

Monthly rental in Bang Tao generates, based on our data, 25,000-40,000 THB per month for a 40-50 m2 unit (as of 2026). That translates to annual gross income of 300,000-480,000 THB at full occupancy. However, without nightly turnover, annual occupancy in the monthly rental market rarely exceeds 75-80%, and in the low season can drop to 40-50%.

Occupancy seasonality by district

Seasonality is the primary risk factor in any rental model in Phuket and Koh Samui. The figures below are drawn from OTA platform data and operator reports covering 2025.

Phuket - high season (November to March):

  • Bang Tao, Layan, Surin: occupancy 78-88%, ADR 3,500-5,500 THB
  • Kamala, Karon: occupancy 72-82%, ADR 2,800-4,200 THB
  • Rawai, Nai Harn: occupancy 65-75%, ADR 2,200-3,400 THB

Phuket - low season (May to October):

  • Bang Tao, Layan, Surin: occupancy 45-55%, ADR 2,200-3,500 THB
  • Kamala, Karon: occupancy 38-48%, ADR 1,800-2,800 THB
  • Rawai, Nai Harn: occupancy 28-38%, ADR 1,400-2,200 THB

Koh Samui - high season (December to March):

  • Chaweng: occupancy 75-85%, ADR 3,000-4,800 THB
  • Bophut (Fisherman's Village area): occupancy 70-80%, ADR 2,800-4,000 THB
  • Maenam: occupancy 60-72%, ADR 2,200-3,200 THB

Koh Samui - low season (May to October):

  • Chaweng: occupancy 40-50%, ADR 1,800-2,800 THB
  • Bophut: occupancy 35-45%, ADR 1,600-2,500 THB
  • Maenam: occupancy 25-35%, ADR 1,200-2,000 THB

Annual average occupancy in prime locations (Bang Tao, Chaweng) sits at roughly 62-70% in our data sets. In less-trafficked districts (Rawai, Maenam) it falls to 47-55%. These differences flow directly into annual revenue and should be the starting point for any location decision.

Risks and mistakes

  • Inflated purchase price - the most common hidden cost of a guarantee programme. We always compare the guaranteed-unit price against comparable unlicensed units in the same district before drawing any conclusions
  • Unverified operator solvency - a guarantee contract is only as reliable as the entity signing it. During 2020-2021, several Phuket programmes suspended payments entirely due to the impact of border closures on occupancy
  • Ignoring post-guarantee costs - after 3-5 years the owner holds a unit that must generate income independently, either through a rental pool at market terms or through self-managed letting
  • Tax obligations in both countries - foreign-resident buyers need to understand withholding tax applied at source in Thailand (approximately 5% of gross income on the standard flat-rate basis) and any reporting obligations in their country of residence
  • No hotel licence in the building - investing in an unlicensed building restricts the business model to monthly lets, reducing potential income by an estimated 20-40% compared with short-stay operation
  • Calculating yield on high-season rates only - our analysts always apply full-year average occupancy, weighting both the high and low seasons
  • Currency exposure - rental income arrives in THB while financing costs may be denominated in USD or EUR. In our tracked data, THB/USD volatility ranged from 8-12% per year between 2023 and 2025

FAQ

Does a 7% guaranteed rent in Phuket represent a real return?

No. The 7% gross figure is quoted before operating costs, taxes, and any adjustment for the inflated purchase price. Based on our estimates, real net returns settle at 3.5-5.5% depending on location and cost structure.

What hidden costs does a rental guarantee programme carry?

The main concealed costs are: a unit price premium of 10-20%, common area fees (500-700 THB/m2/year), sinking fund contributions, insurance, withholding tax at source (approximately 5% of gross income), and restricted personal use of the unit.

Can I legally rent an apartment in Phuket on a nightly basis?

Only if the building holds a hotel licence compliant with Hotel Act B.E. 2547. Without one, the legal minimum rental period is 30 days. Penalties for unlicensed short-stay letting can reach 20,000 THB per day.

What does an external property manager charge in Phuket?

Fees range from 15-35% of revenue depending on service scope. Rental pool operators typically charge 25-35% of gross post-OTA revenue; independent management firms generally charge 15-20% of net post-OTA revenue. Housekeeping, OTA commissions, and minor repair costs are additional.

How does seasonality affect occupancy on Koh Samui?

During the high season (December to March), Chaweng occupancy reaches 75-85%. In the low season (May to October) it falls to 40-50%. In quieter districts such as Maenam the drop is steeper, reaching 25-35% in the low months.

What taxes apply to rental income from a Thai property?

Thailand applies a withholding tax of approximately 5% of gross income under the standard flat-rate regime. Buyers should also review their own country's tax treaty with Thailand and any foreign income reporting requirements that apply to them as residents.

Rental pool or rental guarantee - which is the better choice?

A guarantee offers predictability for 3-5 years but hides its cost inside the purchase price. A rental pool ties income to actual occupancy but does not inflate the asset price. Based on our analysis, independent management with a specialist operator produces the highest net yield (5.2-5.5%), though it requires active involvement and market familiarity.

What happens when the guarantee period ends?

The owner shifts to market-rate terms, either joining the building's rental pool or engaging an independent operator. In districts with structurally lower occupancy (Rawai, Maenam), income after guarantee expiry may be 30-50% below the guaranteed amount.

Is it worth buying a guaranteed-rent apartment on Koh Samui?

Guarantee offerings on Koh Samui are less common than in Phuket. Annual average occupancy in areas such as Bophut sits at 52-62%, which - after operator commissions - typically yields a net return of 3.5-4.5% per year. We always run a side-by-side price comparison with and without the programme before drawing a conclusion; the gap reveals the real cost of the guarantee.

In our team's assessment, rental guarantee programmes in Phuket function primarily as a marketing instrument that lowers the perceived decision threshold for buyers, but rarely maximise net returns. We recommend that prospective buyers compare the guaranteed-unit price directly against equivalent non-guaranteed stock, verify the financial standing of the guaranteeing entity, and build their return projections on annual average occupancy that fully accounts for the low season. Independent management with a professional operator consistently shows the highest net yield in our models, though it requires genuine market engagement.

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