The Definition
In Thailand, the Sinking Fund Balance refers to the remaining amount in a condominium or housing project's reserve fund, collected as a one-time upfront contribution from new buyers (typically 400-800 THB per square meter of unit area) and managed by the Condominium Juristic Person (CJP) or property management for major, infrequent expenses like structural repairs, elevator replacements, or repainting common areas. This balance ensures funds are available without special assessments, distinct from monthly Common Area Maintenance (CAM) fees that cover daily operations. Buyers of pre-owned units usually do not contribute anew if the original owner already paid, but the balance affects future top-ups decided by owners.
Western buyers might expect sinking funds to be mandatory, audited regularly with lifecycle forecasts (as in some strata systems like Australia), and fully refundable or transferable upon sale with interest earned. In Thailand, while legally required for condos, separate ring-fenced accounts are not mandated, leading to potential mismanagement risks, and contributions are non-refundable even on resale, treated as a sunk cost absorbed by the project. Top-ups depend on owner votes rather than strict audits, and rates vary widely by project without national standardization.
Buyers unaware of non-refundability may feel cheated when selling without recouping their contribution, especially if the balance is low and top-ups are called. In poorly managed projects, lack of legal mandates for separate accounts risks commingling with CAM funds, leading to misuse or insolvency during major repairs. Foreign expats often overlook checking the current balance pre-purchase, facing unexpected votes for replenishments post-buy.
The sinking fund applies identically to foreigners and Thai citizens buying condos, as it's a project-level requirement under the Condominium Act, not differentiated by nationality. Foreigners, limited to 49% foreign ownership per project, contribute proportionally like Thais, with no exemptions or extra fees tied to visa/ownership status.
Governed by the Condominium Act B.E. 2522 (1979), as amended, which mandates a sinking fund for all condo projects, requiring developers to collect it upfront and transfer control to the CJP upon project completion. The Department of Lands oversees title transfers where disclosure occurs, while the CJP manages the fund post-handover; no specific AMLO or Revenue Department rules apply directly, but transparency is enforced via owner meetings.
Let’s look at a real-world scenario to understand how Sinking Fund Balance is applied during a property transaction.
The major elevator replacement is paid directly from the reserve, leaving 500,000 THB without immediately requiring owners to pay a special top-up fee.
The Situation: A Thai buyer purchased a pre-owned Bangkok condo without checking the sinking fund balance.
The Challenge: Two years later, owners voted a 20,000 THB/unit top-up for roof repairs as the balance was depleted from prior mismanagement, hitting the buyer with unexpected costs.
The REMAX Difference:
A REMAX agent reviews CJP minutes and balance statements pre-offer, negotiates seller disclosures, and advises on projects with healthy reserves above 500 THB/sqm equivalent per unit to avoid surprises.
A quick breakdown of how this term compares to its closest alternative.
| Feature | Sinking Fund Balance | Common Area Maintenance (CAM) Fees |
|---|---|---|
| Frequency | One-time upfront payment (with possible future top-ups) | Recurring monthly payment |
| Purpose | Major, infrequent, or one-off structural repairs | Daily operations like cleaning, security, and staff |
| Refundability | Non-refundable upon resale | Not applicable as it is an ongoing service fee |
Ignoring the sinking fund balance risks surprise top-up fees that erode investment returns, especially in aging projects where major repairs loom. Buyers must verify it to ensure long-term financial security and property value preservation.
Always demand the latest CJP financial report showing the sinking fund balance per sqm (aim for >400 THB equivalent) before signing—walk away from projects under 200 THB/sqm to dodge future calls.
Reality: It is non-refundable and stays with the CJP, even if selling; pre-owned buyers typically skip payment.
Reality: Mandated by the Condominium Act for new purchases, fixed per sqm in project rules.

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