Thailand Encourages Solar Rooftop Adoption with Tax Deductions of Up to THB 200,000

Thailand has officially introduced a tax incentive allowing households to claim up to THB 200,000 in personal income tax deductions for installing rooftop solar systems, as the government seeks to accelerate clean energy adoption, reduce household electricity costs and cut the country’s reliance on imported energy.

The measure, announced by Thailand’s Minister of Energy on 11 March 2026, took effect following its publication in the Royal Gazette. Under the new scheme, individuals installing solar PV systems on residential rooftops can deduct the actual cost of eligible equipment and installation from their personal income tax, up to a maximum of THB 200,000.

To qualify, the rooftop solar system must be an on-grid system connected to the electricity network, operated by either the Metropolitan Electricity Authority (MEA) or the Provincial Electricity Authority (PEA). Applicants must also provide a full electronic tax invoice (e-Tax Invoice) as supporting documentation.

The tax incentive will remain in effect from 11 March 2026 through 31 December 2028.

Supporting Clean Energy Investment

Thailand’s Ministry of Energy expects the measure to deliver multiple benefits, including lower household electricity bills, increased renewable energy generation and reduced greenhouse gas emissions.

The government estimates that the rooftop solar initiative could help reduce greenhouse gas emissions by approximately 15.28 million tonnes per year and stimulate more than THB 240 billion in domestic investment.

The ministry described rooftop solar adoption as delivering three key benefits: reducing electricity costs, providing tax savings of up to THB 200,000, and contributing to national emissions reduction efforts.

Tax Incentives Also Extended to Businesses

The clean energy tax measures also provide incentives for businesses to invest in energy-efficient equipment and machinery.

Individuals earning income under Sections 40(5)–(8) of Thailand’s Revenue Code and corporate entities that invest in replacing machinery or materials for energy conservation can claim 1.5 times the investment cost as a tax-deductible expense.

Eligible equipment must be new and meet high energy-efficiency standards. Examples include heat pumps, heat-reflective wall coatings, heat-insulating glass and electrical appliances carrying the highest Level 5 energy-efficiency label.

The tax benefit cannot be claimed in combination with other investment incentives, such as those provided by the Board of Investment (BOI) or the Eastern Economic Corridor (EEC) programmes. Eligible investments must also be supported by an e-Tax Invoice.

Thailand Pushes Ahead with Low-Carbon Energy Transition

The new tax incentives form part of Thailand’s broader efforts to increase clean energy consumption and improve energy efficiency across both the residential and industrial sectors.

By reducing the upfront financial burden of rooftop solar installations and energy-efficient equipment, the government aims to encourage greater private-sector and household investment in clean energy while reducing national energy import requirements.

Thailand’s latest tax incentives signal a stronger push towards distributed solar generation and energy efficiency, creating new opportunities across the country’s rooftop solar, energy equipment and clean technology markets while supporting its longer-term transition towards a low-carbon economy.