Car Loan Calculator — Thailand
Estimate your monthly car-loan installment in THB using Thailand's typical auto-finance rates, and see the full interest cost. No signup, no account needed.
Enter a car price, a down payment of 0–90%, a rate between 0% and 100%, and a term above zero (up to 50 years) to see results.
Car finance rates in Thailand (2026)
Car loans in Thailand typically run about flat 2.5–4.5% p.a. (about 5–9% reducing balance). Rates are usually quoted as a flat rate, so the effective reducing-balance cost is higher.
These are reference figures for 2026 - always confirm the current rate and the effective (reducing-balance) APR with the lender before you commit.
Where to get a car loan in Thailand
Commonly used providers include Toyota Leasing, Siam Kubota, KBank, SCB and Krungthai. Rates and terms vary by lender, your credit profile, and whether you are buying new or used - it pays to compare at least two or three offers.
Deposit and loan term
Deposit requirements vary by lender. Loan terms run up to about 84 months. A bigger deposit and a shorter term both cut the total interest you pay - use the calculator above to see the trade-off for your own numbers.
Worked example
For every ฿480,000 financed at 3.90% over 5 years:
- Monthly installment: ฿8,818
- Total repaid: ฿529,097
- Total interest: ฿49,097
Scale to your financed amount, and remember a bigger deposit and shorter term lower the total interest.
How to pay less interest on your car loan
- Put down a larger deposit - it reduces both the monthly payment and the total interest.
- Pick the shortest term you can comfortably afford; a longer term lowers the monthly cost but raises the total.
- Compare the effective reducing-balance rate, not a headline flat rate - a flat rate looks cheaper than it really is.
- A stronger credit profile usually earns a lower rate, so it is worth checking before you apply.
A named-lender rate check: Siam Commercial Bank's car loan (2026)
Car loans in Thailand are almost always quoted as a flat rate, not a reducing-balance rate. According to a bank-by-bank rate comparison published by car.kapook.com on 24 June 2026 (last updated 2 July 2026), Siam Commercial Bank (SCB) quotes new-car hire-purchase loans at a flat rate of 2.20%–5.60% per year, which the bank itself converts to a disclosed effective (reducing-balance) rate of 4.20%–9.94% per year. The same table lists Bank of Ayudhya (Krungsri Auto) at a flat rate of 1.98%–5.25% (effective 3.81%–9.80%). As a second reference point, TMBThanachart's TTB DRIVE new-car loan page (published 21 August 2025) quotes an effective rate of 5.21%–10.00% per year, noting the Bank of Thailand effectively caps new-car hire-purchase near 10% on an effective basis.
The gap between the two numbers matters: a flat rate is applied to the original loan amount for every year of the term, while an effective rate reflects interest on the declining balance — so a flat rate of roughly 4% typically corresponds to an effective rate of roughly 7–10%. This means fincalcyou.com's rate of 3.9% (flat) is realistic as a representative mid-market flat rate, comfortably inside the roughly 2.0%–5.6% flat-rate band quoted by SCB and Krungsri Auto.
A more realistic example: financing a ฿750,000 new car at SCB's mid-range flat rate of 3.90% over a common 6-year (72-month) hire-purchase term works out to total interest of ฿175,500, total repayable of ฿925,500, and a monthly installment of ฿12,854. Converting that same payment to an effective annual rate gives about 7.4% — squarely inside SCB's own quoted 4.20%–9.94% effective range for a 3.90% flat quote.
Excise tax on new cars: CO2-based rates that shape which cars Thais actually finance
Thailand taxes new passenger cars (up to 3,000cc, 10 seats or fewer) on their carbon dioxide emissions rather than a flat percentage. Under the excise tax schedule the Finance Ministry set for 2022–2025, cars emitting under 150 g/km CO2 are taxed at 25%, 150–200 g/km at 30%, and over 200 g/km at 35%. From 1 January 2026 through 31 December 2027 the brackets tighten further and add a new bottom tier: under 100 g/km at 13%, 100–120 g/km at 22%, 120–150 g/km at 25%, 150–200 g/km at 29%, and over 200 g/km at 34% — part of a stated push to reward lower-emission vehicles and support the local EV industry. Because this excise tax is baked into the sticker price before any loan is arranged, it directly affects how much car buyers finance: a fuel-efficient hatchback in the lowest CO2 bracket can carry a meaningfully lower excise load than an equivalent SUV, even before VAT (7%) is applied on top.
Compulsory motor insurance (พ.ร.บ – Por Ror Bor) is required before a car loan can even be registered
Separately from any voluntary CASCO-style cover a lender may require, every registered vehicle in Thailand must carry compulsory third-party motor insurance under the Motor Vehicle Accident Victims Protection Act, commonly called “Por Ror Bor” and regulated by the Office of Insurance Commission (OIC). It pays medical costs up to THB 30,000 as an initial no-fault advance (rising to THB 80,000 if the insured is not at fault), and death or permanent-disability compensation of up to THB 500,000 per person when the insured party is not at fault, plus a daily hospitalisation allowance of THB 200 for up to 20 days. Crucially, Por Ror Bor does not cover damage to the vehicle itself, theft, or natural-disaster losses — which is exactly the gap that lenders' own compulsory or recommended CASCO-type policies are designed to fill on a financed car, since the vehicle is the lender's collateral until the hire-purchase agreement is settled.
Regulators cap the interest rate a hire-purchase lender can charge, and the Bank of Thailand now supervises the whole market directly
Thai car-finance interest rates are not left entirely to the market: under Office of the Consumer Protection Board (OCPB) rules, hire-purchase interest is capped at 10% per year (effective rate) for a new car and 15% per year for a used car, with a separate 23% ceiling for motorcycles — caps reviewed periodically rather than fixed forever. From 2 December 2025, oversight of this roughly THB 1.6 trillion hire-purchase and leasing market — around 3,000 operators nationwide — passed more directly to the Bank of Thailand (BOT) itself, which now requires lenders to register and report, applies close supervision to the roughly 60 large operators with portfolios over THB 1 billion, and runs random inspections of smaller players, all in the name of “responsible lending practices and market conduct.” For a borrower, this means the flat-rate car loan quotes banks advertise are already operating inside a regulatory ceiling, not just a competitive one.
Frequently Asked Questions
What is the typical car loan rate in Thailand?
As a 2026 reference, car finance in Thailand runs about flat 2.5–4.5% p.a. (about 5–9% reducing balance). Your actual rate depends on the lender, your credit profile, and whether the car is new or used.
How much deposit do I need for a car loan in Thailand?
Deposit requirements vary by lender. A larger deposit lowers both your monthly payment and the total interest you pay.
Which lenders offer car loans in Thailand?
Commonly used providers include Toyota Leasing, Siam Kubota, KBank, SCB and Krungthai. It pays to compare two or three offers, since rates and terms vary by lender and by your credit profile.
How is the car loan installment calculated?
Using the reducing-balance formula P × r × (1+r)ⁿ ÷ ((1+r)ⁿ − 1) on the financed amount. Dealers may quote a lower-looking flat rate; convert to the effective rate to compare.
What is the difference between a flat interest rate and an effective interest rate on a Thai car loan?
Thai lenders such as Siam Commercial Bank quote car hire-purchase loans as a flat rate applied to the original loan amount every year (e.g. SCB's 2.20%–5.60% flat range, per car.kapook.com, updated 2 Jul 2026). Because Thai regulation also requires disclosure of the equivalent effective (reducing-balance) rate, the same SCB loans show as 4.20%–9.94% effective — roughly double the flat figure.
What car loan interest rate can I expect in Thailand in 2026?
For a new car, expect a flat rate of roughly 2%–6% per year depending on the lender, your credit profile and any manufacturer promotion. SCB and Bank of Ayudhya (Krungsri Auto) both quote flat rates in the 1.98%–5.60% range (car.kapook.com, updated 2 Jul 2026), while TMBThanachart's TTB DRIVE (published 21 Aug 2025) quotes an effective rate of 5.21%–10.00%, close to the roughly 10% effective ceiling that applies across new-car hire-purchase loans in Thailand.
Is fincalcyou.com's rate of 3.9% flat realistic for a Thailand car loan?
Yes. A 3.9% flat rate sits inside the 2.20%–5.60% flat-rate range quoted by SCB and the 1.98%–5.25% range quoted by Bank of Ayudhya/Krungsri Auto as of mid-2026, making it a reasonable representative flat rate for a standard borrower.
How does Thailand's CO2-based excise tax affect the price of a financed car?
New passenger cars are taxed on CO2 emissions rather than a flat rate. For 2022-2025 the brackets are 25% (under 150 g/km), 30% (150-200 g/km) and 35% (over 200 g/km); from 2026-2027 a new 13% bottom tier applies under 100 g/km, rising to 34% above 200 g/km. This excise tax is included in the price you finance, so a lower-emission model can cost meaningfully less to borrow against than a higher-emission one of similar size.
Does compulsory Por Ror Bor insurance cover damage to my financed car?
No. Por Ror Bor (compulsory motor insurance under the Motor Vehicle Accident Victims Protection Act) only covers third-party bodily injury and death, paying medical costs up to THB 80,000 and death/disability compensation up to THB 500,000 when the insured is not at fault. It does not cover damage to your own car, theft, or the other party's vehicle, which is why lenders financing a car typically also require or recommend a separate voluntary policy.
Is there a legal cap on the interest rate a Thai car loan can charge?
Yes. Office of the Consumer Protection Board rules cap hire-purchase interest at 10% per year (effective rate) for new cars and 15% per year for used cars, and since 2 December 2025 the Bank of Thailand directly supervises the roughly THB 1.6 trillion hire-purchase and leasing market to enforce responsible lending practices.
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Sources
Rates are compiled from each country's central-bank publications and the typical offerings of its major commercial banks, reviewed for 2026 and subject to change — always confirm the current rate with a lender before deciding. See our methodology and editorial policy for how we source and update this data.
Additional sources for this page
Car loan interest rate comparison across Thai banks including Siam Commercial Bank and Bank of Ayudhya/Krungsri Auto, via car.kapook.com (published 24 Jun 2026, updated 2 Jul 2026): Interest rates for new-car loans, 2026. TMBThanachart TTB DRIVE new-car loan rates (21 Aug 2025): New-car interest rate check, ttbbank.com.
- Govt slices excise tax for vehicles – CO2-based rate brackets, Nation Thailand (accessed 26 September 2026)
- Chubb Thailand, Compulsory Motor Insurance (Por Ror Bor) coverage: THB 30,000 preliminary medical, THB 80,000 medical, THB 500,000 death/disability, THB 200/day up to 20 days (accessed 15 October 2026)
- Office of Insurance Commission (OIC), Motor Vehicle Accident Victims Protection Act B.E. 2535 (accessed 15 October 2026)
- Bank of Thailand to supervise loans for hire purchase, leasing, Bangkok Post (accessed 26 September 2026)