Road tax, vehicle inspection and LPG checks in Thailand

The order of things

The tax sticker (the green disc on the windscreen or plate) is the last step. The DLT will not issue it until the earlier ones are done:

1. Compulsory insurance (Por Ror Bor)

   It must be valid on the day you pay. See vehicle insurance in Thailand.

2. Inspection, if the vehicle is old enough

   At a licensed inspection centre. The certificate is valid for 90 days.

3. Gas system check, if it runs on LPG or NGV

   Done within 30 days before the tax payment.

4. Pay the tax

   At a DLT office, a participating post office or online.

When your vehicle needs an inspection

Verified These thresholds are confirmed first-hand by the ThaiDrive team, and the three guides we read agree. None of them cites the regulation (ThaiLawOnline says it could not locate it), so the source of the rule is practice, not a text we can link.

• What is checked: headlight alignment, brake efficiency, exhaust noise and emissions (carbon monoxide and hydrocarbons).
• Where: a private inspection centre licensed by the DLT, marked ตรอ. (pronounced "Tor Ror Or").
• Age is counted from the first registration date in the registration book, not from the model year.
• Documents: the registration book (original or a clear copy). You usually do not need your own ID.

How the road tax is calculated

For cars the annual tax is progressive by engine size, in baht per cubic centimetre:

• Example: a 1,498 cc car pays about 1,647 THB a year, and a 1,998 cc car about 2,892 THB.
• Age discount: from the sixth year the tax drops by 10% a year, reaching 50% from the tenth year.
• Indicative running costs from another guide: about 1,000–1,500 THB for a 1.2 litre eco-car and 2,500–3,500 THB for a 2.0 litre sedan, which is consistent with the rates above.

The rates for cars match the published Thai tax scale. Check your exact amount on the DLT e-service before you go, since discounts and electric vehicles are treated separately.

LPG, CNG and NGV: the gas system check

Vehicles with a gas system have an extra requirement. The rules in force are these, according to the sources we could find:

• The system is inspected every year before the tax is paid, for LPG and for NGV/CNG, whether the system was fitted at the factory or by a workshop.
• The inspection is done within the 30 days before the tax payment. The LPG rule has applied to tax payment since 2 February 2018.
• Installation must be by a DLT-approved installer, and the vehicle must pass the test after any new installation or change.
• After installing gas, the fuel type must be updated in the registration book within 15 days at a DLT office.

The tank has its own life: a newly installed LPG tank can be used for 10 years, and after that it is re-certified and re-inspected every 5 years. Verified A tank older than 10 years in good condition can be re-certified by a DLT-approved engineer (about 1,000–1,500 THB in a 2018 estimate, against 5,000–10,000 THB to replace it).

Verified The annual system check and the 10-year-then-5-year tank cycle are confirmed first-hand. The 5-year system cycle in the TDL Service guide is the older rule, which the Thai-language sources say has been replaced. Ask the inspection centre which certificates it will issue.

Paying the tax

• When: you can renew up to about 90 days before the sticker expires without losing time. Aim for 2 to 4 weeks before.
• Where: a DLT office, a participating post office, or the DLT e-service website and app.
• Online: you need the compulsory insurance and, if required, the inspection certificate. Payment is by QR code, card (with a surcharge) or bank transfer, and the sticker arrives by post in about 5 to 7 working days.
• Foreigners: passport numbers and names with non-Thai characters sometimes fail in the online system, so renewing in person is the safe route.

If you are late

Verified The 1% monthly surcharge is confirmed first-hand. The monthly compounding, the police fine for an expired sticker and the cancellation after 3 years come from one commercial publisher's pages only, with no regulation cited. Treat them as the most you might face and check with the DLT.

Registering as a foreigner: what proof of address do you need?

Registering a vehicle in your own name, and often renewing it, needs proof of where you live. The usual document is the same Certificate of Residence used for the driving licence. See the step-by-step guide.

Frequently asked questions