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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- Dealer quote difference
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How your car interest and payment are calculated
Amount financed × annual flat rate × years = total interest.
- 1. Down payment
- 900,000 × 20% = 180,000
- 2. Amount financed
- 900,000 − 180,000 = 720,000
- 3. Total flat-rate interest
- 720,000 × 3% × (60 ÷ 12) = 108,000
- 4. Monthly payment
- (720,000 + 108,000) ÷ 60 = 13,800
- 5. Down payment + all instalments
- 180,000 + 828,000 = 1,008,000
Enter valid figures to see the calculation.
Amounts in THB. The default 3% is an example, not a lender offer. Excludes fees, insurance, any separately charged tax or VAT, and balloon payments. Figures are rounded to two decimals; the written quote and contract determine actual payments.
Add insurance to your car budget
Compare voluntary cover, compulsory insurance and the amount you would pay yourself on a claim before choosing a policy.
| Term | Monthly | Total interest | Effective rate |
|---|
Estimates use the values entered and the methodology documented below. Check current provider or authority information before acting.
Built for the complete search intent
Compare the instalment, effective rate and complete monthly car budget
A low advertised flat rate can hide the true annual cost, and a low monthly payment can hide a long commitment. This page compares 48, 60, 72 and 84 months, estimates the effective annual rate and includes insurance and running costs in the affordability check.
Thailand car loan calculator, car finance calculator Thailand and car payment calculator Thailand- Finance amount
- Price minus down paymentConfirm that the contract uses the same vehicle price, deposit and financed extras.
- Quoted rate
- Flat rateThai vehicle promotions commonly quote interest against the original financed amount.
- True comparison
- Effective annual rateThe calculator solves the equal payment cash flow for an estimated effective rate.
- Affordability
- All-in monthly costFinance, insurance and entered running costs are compared with monthly income.
Quote decoder
Eight contract lines to compare before signing
Do not compare offers using the monthly instalment alone.
| Quote line | What to verify | Why it changes the decision |
|---|---|---|
| Vehicle cash price | Discounts and accessories | A higher financed price raises every later cost. |
| Down payment | Percentage and actual THB | It determines the principal and cash required upfront. |
| Financed amount | Price minus down payment plus financed extras | This is the amount on which flat interest is calculated. |
| Flat annual rate | Rate and exact method | A small headline rate is not the same as an effective annual rate. |
| Term | Number and timing of instalments | Longer terms reduce the payment but normally increase total interest. |
| Monthly instalment | Compare with this page | A mismatch can reveal fees, rounding or a different principal. |
| Final payment | Balloon or transfer amount | A low monthly payment may leave a large amount at the end. |
| Insurance and fees | Compulsory, voluntary and lender charges | These can materially raise the real ownership budget. |
Approval, required documents, guarantor conditions and vehicle eligibility are lender decisions and are not predicted here.
Decision checklist
Turn a showroom quote into a comparable decision
Use the live term table and optional dealer-quote field to make every offer use the same assumptions.
- 01
Enter the exact cash price, down payment, flat rate and term from the written quote.
- 02
Compare the calculator’s payment with the dealer or lender payment and investigate any difference.
- 03
Compare total interest and estimated effective rate across 48, 60, 72 and 84 months.
- 04
Add insurance, fuel or charging and maintenance before deciding whether the car fits the monthly budget.
- 05
Request the complete payment schedule, mandatory fees and final-payment terms before signing.
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.
Why does a dealer quote differ from the calculator?
The quote may use a different financed amount, rate, term, rounding method, fee, insurance add-on or final balloon payment. Compare every contract line before relying on the monthly figure.