Can expats claim Thailand's 200,000-baht solar rooftop tax break? The rules, step by step

Thailand's Revenue Department lets individual taxpayers deduct what they actually spend on a home rooftop solar system, up to 200,000 baht, from their assessable income. The window covers systems contracted and submitted for grid connection between 3 March 2026 and 31 December 2028, and the department tightened the paperwork rules on 30 September 2026.

So is it worth it for foreign residents? If you pay Thai personal income tax and the electricity account is in your own name, the rules as published do not shut you out. The catch is in the documents: one wrong name on an invoice or a grid permit, and the claim fails.

The rules at a glance

Step by step: how to claim

1. Check the electricity account. The person claiming has to be named as the electricity user with the Metropolitan Electricity Authority (MEA) or the Provincial Electricity Authority (PEA).
2. Choose a VAT-registered installer that issues full electronic tax invoices. Paper receipts do not count.
3. Make sure the e-Tax invoice shows your taxpayer identification number and wording that shows it is for solar, such as Solar Rooftop or solar panels. That wording is compulsory for invoices issued from 30 September 2026.
4. Apply to the MEA or PEA for grid connection in your own name, and keep both the application and the approval.
5. Tell the MEA or PEA you intend to claim the tax relief. They send your details to the Revenue Department by 15 January of the following year.
6. Claim the deduction in your personal income tax return for the year the grid connection was completed.

When do you actually get the benefit?

Timing catches people out. The Revenue Department's own example: buy the system on 1 December 2026, apply for grid connection on 15 December 2026, receive approval on 5 January 2027, and you claim in the 2027 tax return, filed between 1 January and 8 April 2028. If you want the deduction in your 2026 return, the grid connection needs to be completed in 2026.

The deduction comes off your income after the standard expense deductions, so the cash saving depends on your highest tax band, not on the full 200,000 baht.

Couples and VAT-registered claimants

• If only one spouse has income, that spouse can deduct up to 200,000 baht.
• If both spouses have income and file separately, each can deduct their own actual spend up to 200,000 baht.
• If you are VAT-registered and have already claimed the VAT on the solar invoice as input tax, you cannot use the same invoice for this relief.
• If you claim and later turn out not to meet the conditions, the deduction is reversed and a surcharge under section 27 of the Revenue Code can apply.

Is it right for you?

The relief suits people who own or have long-term use of a house with its own Type 1 residential electricity account, pay Thai income tax, and plan to stay long enough to benefit from lower power bills. It is less useful for condo residents, who rarely control a roof, and for anyone whose electricity account is in someone else's name. This is general information, not tax advice; check your own position with a Thai tax adviser or the Revenue Department's 1161 call centre.