Auto Loan Calculator Guide: Formula & Worked Example
Short answer
Car payment after down payment, trade-in and sales tax. In the fixed example below, monthly payment is 523.92. Your answer depends on the inputs and assumptions you choose.
Formula
Result = Auto Loan Calculator calculation using vehicle price, down payment, trade-in value, sales tax, interest rate, loan term
The inputs are vehicle price, down payment, trade-in value, sales tax, interest rate, loan term. Use the input scale shown beside each field and keep time periods and units consistent. Only round the final result for display.
Worked example
- Vehicle price
- 30000
- Down payment
- 5000
- Trade-in value
- 0
- Sales tax
- 7
- Interest rate
- 6
- Loan term
- 5
- Monthly payment: 523.92
- Loan amount: 27,100.00
- Sales tax: 2,100.00
- Total interest: 4,335.14
- Total cost: 36,435.14
Understanding the result
Car payment after down payment, trade-in and sales tax. Start with the base example, then replace each value with the figure that matches your situation.
Vehicle price
The example uses 30000 for vehicle price. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Down payment
The example uses 5000 for down payment. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Trade-in value
The example uses 0 for trade-in value. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Sales tax
The example uses 7 % for sales tax. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Interest rate
The example uses 6 % / yr for interest rate. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Loan term
The example uses 5 years for loan term. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
What the comparison means
The comparison changes only vehicle price, keeping every other example input fixed. This isolates that input's effect on the primary result. It does not predict future outcomes.
Rates, fees, eligibility, local tax rules and provider rounding can change the final amount. Reference tax and exchange-rate data may be outdated; verify the official source before deciding.
Comparison
| Scenario | Input | Result |
|---|---|---|
| Lower input | Vehicle price: 24000 | Monthly payment: 399.80 |
| Base example | Vehicle price: 30000 | Monthly payment: 523.92 |
| Higher input | Vehicle price: 36000 | Monthly payment: 648.04 |
Common mistakes
- Using the wrong units for vehicle price.
- Comparing results while changing more than one input at a time.
- Rates, fees, eligibility, local tax rules and provider rounding can change the final amount. Reference tax and exchange-rate data may be outdated; verify the official source before deciding.
Checklist
- Confirm vehicle price.
- Confirm down payment.
- Confirm trade-in value.
- Confirm sales tax is expressed in %.
- Confirm interest rate is expressed in % / yr.
- Check the result against your source or provider.
Calculators Percentage Editorial Team
Calculator guides from the Calculators Percentage team. These introductory examples are educational, not professional advice.
Last reviewed:
Rates, fees, eligibility, local tax rules and provider rounding can change the final amount. Reference tax and exchange-rate data may be outdated; verify the official source before deciding.