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Thailand Car Loan Calculator

Calculate monthly payments, total interest, and the true Effective Interest Rate (EIR) before you sign.

Last updated: May 2025

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πŸ“‹ Loan Details

Sticker price or agreed price with the dealer
Typically 0–20% of the car price
Flat Rate 2.99% β‰ˆ EIR ~5.5–5.8% β€” true cost is ~1.8–2Γ— the advertised rate
New cars: 2–4% flat / Used cars: 3–6% flat
Thai auto loans: max 7 years (84 months)
πŸš—

Fill in the details and click Calculate
to see your results.

How Thai Car Loans Work (Flat Rate Method)

Almost all car loans in Thailand use the Flat Rate method, which is different from home loans (Reducing Balance):

Total Interest = Loan Amount Γ— Flat Rate% Γ— Years
Monthly Payment = (Loan + Total Interest) Γ· Number of Months

Example: Borrow 500,000 THB at 2.99% flat for 5 years:

  • Total Interest = 500,000 Γ— 2.99% Γ— 5 = 74,750 THB
  • Monthly Payment = (500,000 + 74,750) Γ· 60 = 9,579 THB/month

Why is the EIR Nearly Twice the Flat Rate?

Because flat rate interest is calculated on the original principal throughout the entire loan term, even as you pay it down each month. This means the true cost of borrowing is approximately 1.8–2Γ— the advertised flat rate. For example, Flat 2.99% β‰ˆ EIR 5.5–5.8% per year.

Thai Car Loan Rates (2025)

  • New cars β€” dealer financing (promo): Flat 1.89–2.99%
  • New cars β€” bank financing: Flat 2.49–3.99%
  • Used cars: Flat 3.49–6.00%

Tips to Reduce Auto Loan Costs

  • Higher down payment β†’ lower principal β†’ significantly less total interest
  • Shorter loan term β†’ less total interest, even though monthly payments are higher
  • Always compare EIR, not Flat Rate, to fairly evaluate competing offers
  • Check for additional fees: stamp duty, credit life insurance, and processing fees

Reducing Balance Car Loans in Thailand: Who Offers Them?

Most Thai auto loans from dealers and leasing companies use Flat Rate, but some direct bank loans use Reducing Balance, which is more transparent:

  • TISCO Bank β€” car loans with Reducing Balance at ~5–8% p.a.
  • Krungthai Bank (KTB) β€” certain civil servant car loan products
  • Top-up / Refinance products β€” some reference the bank's MLR (Reducing Balance)

Advantage of Reducing Balance: The rate shown equals the true EIR, and early payoff genuinely saves interest β€” no minimum interest clauses like Flat Rate contracts.

Example: 500,000 THB loan, 5 years
Flat 2.99% β†’ ~9,579 THB/month | Total interest: 74,750 THB | EIR β‰ˆ 5.75%
Reducing 5.75% β†’ ~9,607 THB/month | Total interest: ~76,400 THB | EIR = 5.75%

Frequently Asked Questions (FAQ)

What is the difference between Flat Rate and Reducing Balance?
Flat Rate charges interest on the full original principal throughout the loan. Reducing Balance charges interest only on the outstanding balance each month, making it significantly cheaper. Thai car loans almost always use Flat Rate.
How much should I put down on a car in Thailand?
While 0% down is available for some new cars, a 15–25% down payment is recommended to reduce the loan amount, total interest, and risk of being "underwater" on the loan in the first 1–2 years when the car depreciates quickly.
What loan term is best for a car loan?
4–5 years offers the best balance between monthly payments and total interest paid. A 7-year term gives lower monthly payments but significantly higher total interest, and maintenance costs tend to increase after 5 years.
Can I pay off my car loan early in Thailand?
Yes, but flat-rate contracts typically require a minimum interest payment (e.g., 50–80% of total interest) even if you pay off early. Read the contract carefully and calculate whether early payoff is actually worthwhile.

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