Thailand is giving businesses a stronger reason to invest in energy efficiency. Under Royal Decree No. 805 B.E. 2569, that opportunity now comes with a paperwork test.
For hotels and serviced apartments, the incentive could support investment in high-efficiency machinery, equipment and energy-saving materials. But the value depends on records: what was bought, where it was installed, when it became operational, who supplied it and whether it meets the required efficiency standards.
And this is where sustainability ambition meets capex discipline. Hotels that plan early can turn energy-efficiency upgrades into stronger financial, reporting and procurement assets. Those that wait until tax season may find the opportunity has been lost between the purchase order, the installation record and the invoice file.
Royal Decree No. 805, issued under the Revenue Code, took effect in March 2026 and runs until 31 December 2028. While the decree also covers residential rooftop solar, the relevant section for hotel and serviced-apartment operators concerns certified high-efficiency machinery, equipment and energy-saving materials.
The incentive is often described as a 150% deduction. More precisely, it provides eligible taxpayers with additional tax relief linked to qualifying expenditure. That relief is subject to certification standards, use in Thailand, electronic invoicing and restrictions on overlapping incentives.
For operators, the distinction matters. A THB2 million investment in approved HVAC, machinery or energy-saving equipment could support a THB3 million deduction from taxable income, depending on eligibility and the operator's tax position. It is a deduction, not a cash rebate.
The Royal Decree provides a direct fiscal incentive for taxpayers to invest in qualifying assets, subject to conditions such as certification standards, use within Thailand, and compliance with electronic tax invoicing requirements.
— Paul Ashburn, Co-Managing Partner at HLB Thailand
The benefit is tied to evidence. Qualifying assets must be new, located in Thailand and properly certified. Operators must keep electronic tax invoices from VAT-registered suppliers. Expenses also cannot be double-claimed under other incentives.
The decree is also part of a wider shift. Thailand is using several policy levers to encourage businesses to modernise equipment, cut energy demand and improve operational performance.
For many hotel operators, the Revenue Department incentive is likely to be the broadest starting point because it applies through the tax system. BOI support may be relevant for qualifying Thai-owned SMEs and specific productivity or energy-efficiency investments. DEDE support falls outside the tax system and may be more accessible to some operators, as it provides direct cost support for machinery and high-efficiency equipment upgrades.
These measures should not be treated as mutually exclusive by default. They are different tools aimed at the same outcome. The practical question is which incentives may apply, how they interact and what evidence must be in place before procurement begins.
That puts records at the centre of the capex decision.
Before committing spend, operators should check:
- whether the asset qualifies under the intended scheme or schemes
- whether it is new, located in Thailand and correctly certified
- whether the supplier is VAT-registered and can issue the required e-tax invoice
- whether installation will be completed within the eligible period
- whether costs need to be separated across different parts of a wider project
- whether operational records are strong enough for tax, reporting and buyer review
A hotel may invest in better systems, reduce energy use and improve performance. Without clean records, those gains are harder to use in tax planning, procurement, owner reporting or sustainability communications.
A reviewed sustainability record can help operators organise what was purchased, what changed, what evidence exists and where the gaps remain. It does not guarantee a tax deduction, BOI incentive or DEDE co-payment claim. Those depend on each scheme's rules and should be checked with qualified Thai tax or legal advisers.
But good records do make the next step easier. They connect operational improvement with the documentation needed for finance, reporting and commercial conversations.
Thailand's energy-efficiency push shows how sustainability investment is becoming more technical and more closely tied to proof. The operators best placed to benefit will not simply be those that spend first. They will be the ones that can prove what they bought, when it was installed, how it performs and why it qualifies.
Tuu provides independently reviewed sustainability records for hotel and serviced-apartment operators in Southeast Asia. These records help operators organise evidence, strengthen internal readiness and support disciplined sustainability documentation. They do not replace Thai tax, legal or scheme-specific advice.
This article is based on Royal Decree No. 805 B.E. 2569, public tax summaries, BOI materials, commentary from HLB Thailand, and Thai government information on DEDE co-payment support. It is for general information only and does not constitute tax or legal advice. Operators should seek qualified Thai tax counsel before making claims under any scheme.