Annual Car Tax Calculator (Private Passenger Car, รย.1)

This calculator estimates the annual road tax for a Thai private passenger car with up to 7 seats (รย.1, white-plate). Enter the engine displacement in cc from your registration book and it applies the progressive per-cc rates — the first 600 cc at 0.50 baht/cc, 601–1,800 cc at 1.50 baht/cc, and anything above 1,800 cc at 4 baht/cc — then deducts the age reduction for cars registered more than 5 years: 10% from year 6, rising to a maximum of 50% at 10 years and over. Everything runs in your browser and nothing is uploaded.

Engine size (displacement) *

Shown on your vehicle registration book under “displacement”, e.g. 1,498 cc.

Car age or registration year

Age in years Registration year (B.E.)

Cars registered for more than 5 years get an age-based reduction. Enter 0 for a new car or one under 5 years old.

Your annual car tax will appear here

Enter the engine size (cc) to estimate the annual car tax.

Tax payable (estimate)

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Base tax (before reduction)

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Age reduction

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How the cc-based tax is calculated

Displacement tier	cc in tier	฿/cc	Tax

Good to know

This tool covers private passenger cars with up to 7 seats only (รย.1, white-plate). Pickups (รย.3), vans and trucks are taxed by vehicle weight, which is not covered here.

This figure is the annual road tax only. It does not include the compulsory motor insurance (พ.ร.บ.), which is a separate charge of roughly 600–900 baht a year for a passenger car.

This is an estimate for private passenger cars using the cc-based rates only, and may differ slightly from the exact amount. Please verify with the Department of Land Transport before paying.

How to use

Open your vehicle registration book and read the “displacement” field, then enter the cc.
Choose how to enter the age: a number of years, or the registration year in B.E.
See the base cc-based tax, the age reduction and the net tax payable instantly.
Review the per-tier table to understand exactly how the tax is built up.
Copy the summary to keep for reference or comparison before renewing your tax.

Features

Progressive per-cc tax using the private passenger car (รย.1) rates
Age reduction for cars over 5 years old, from 10% up to 50%
Enter age as a number of years or as a B.E. registration year
Per-tier breakdown table showing where each part of the tax comes from
Clear note that pickups (รย.3) and พ.ร.บ. insurance are charged separately
100% in-browser — your vehicle details are never stored or uploaded

Frequently asked questions

How is the annual car tax calculated?

A private passenger car (รย.1) is taxed on engine displacement in progressive tiers: the first 600 cc at 0.50 baht/cc, 601–1,800 cc at 1.50 baht/cc, and cc above 1,800 at 4 baht/cc, summed together. A 1,500 cc car, for example, is (600 × 0.50) + (900 × 1.50) = 1,650 baht before any age reduction.

How much is the reduction for an older car?

Cars registered for more than 5 years get a reduction on the cc-based tax: 10% in year 6, 20% in year 7, 30% in year 8, 40% in year 9, and 50% from year 10 onwards.

Can I use this for a pickup truck?

No. This tool is only for private passenger cars with up to 7 seats (รย.1, white-plate). Pickups (รย.3), vans and trucks are taxed by vehicle weight using different rates that are not covered here.

Does the amount include the พ.ร.บ. insurance?

No. The figure shown is the annual road tax only. The compulsory motor insurance (พ.ร.บ.) is separate and costs roughly 600–900 baht a year for a passenger car, paid on top when you renew.

Will it match exactly what the Department of Land Transport charges?

It is an estimate based on the cc-based rates for private passenger cars, which usually matches the real amount. Late-payment penalties or special vehicle types can differ, so confirm the final amount with the Department of Land Transport before paying.

Should the registration year be in B.E. or A.D.?

Enter it in the Buddhist era (B.E.), for example 2560. The tool works out the car age from the current year automatically. You can also enter the age directly as a number of years instead.