Car finance in Thailand
Thailand Car Loan Calculator 2026 | Flat vs Effective Rate
Enter the car price, down payment, quoted flat rate and term. See the monthly instalment, estimated effective annual rate and a realistic monthly budget including insurance and running costs.
Start calculatingYour figures
Calculate your estimate
Adjust any field. The result updates immediately and stays on this device unless you choose to share it.
Estimated monthly payment
—Enter your figures to see the estimate.
- Financed amount
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- Total interest
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- Total paid
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- Estimated effective annual rate
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- Payment-to-income
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- All-in monthly car budget
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| Term | Monthly | Total interest | Effective rate |
|---|
Estimates use the values entered and the methodology documented below. Check current provider or authority information before acting.
Method and limits
What this estimate means
Financed amount × flat rate × years gives total interest. The equal payment cash flow is then solved for an estimated effective annual rate.
- Included
- Vehicle price, down payment, quoted flat interest, repayment term and user-entered insurance and running costs.
- Not included
- Lender fees, compulsory insurance, voluntary insurance, registration, accessories and any balloon payment.
Before you decide
Use the result carefully
- 01
Compare the effective annual rate, not only the advertised flat rate.
- 02
Compare 48, 60, 72 and 84 months: a lower payment can still create a higher total cost.
- 03
Check the all-in car budget against income, not only the finance instalment.
- 04
Ask the lender for the complete payment schedule and all mandatory fees before signing.
Primary references
Official and authoritative sources
Formula assumptions are reviewed against these sources. A linked source may be available primarily in Thai.
Questions
Common questions
Why is a Thai car-loan flat rate different from an effective rate?
A flat rate applies interest to the original financed amount for the whole term. An effective rate reflects the declining balance and is normally higher than the quoted flat percentage.
Should I choose 48, 60, 72 or 84 monthly instalments?
Compare both the payment and total interest. A longer term reduces the monthly instalment but normally increases the total interest and keeps the vehicle encumbered for longer.
Does this prove that I will qualify for finance?
No. Approval depends on the lender, visa and work status, income evidence, credit history, guarantor requirements and the vehicle.
Does the payment include car insurance?
No. Insurance and registration costs are separate unless the lender explicitly includes them in the financed amount.