Auto Loan Calculator
Estimate monthly car payments, total loan interest, down payment savings, and trade-in tax credits with a complete amortization breakdown.
For 60 monthly payments
Principal balance borrowed
Financing cost over 60 mos
Price + tax + fees + interest
| Period | Principal Paid | Interest Paid | Remaining Balance |
|---|---|---|---|
| Year 1 | $5,333 | $1,824 | $25,152 |
| Year 2 | $5,690 | $1,467 | $19,461 |
| Year 3 | $6,071 | $1,086 | $13,390 |
| Year 4 | $6,478 | $680 | $6,912 |
| Year 5 | $6,912 | $246 | $0 |
How Auto Loan Financing Works
Financing a vehicle involves borrowing a principal sum from a bank, credit union, or captive dealer financing company. Each monthly payment is split between paying off the borrowed principal balance and the interest charges determined by your Annual Percentage Rate (APR).
Tips to Save on Auto Financing
- Get Pre-Approved: Obtain loan pre-approvals from your local credit union or bank before stepping into a dealership to negotiate from a position of strength.
- Keep Terms Under 60 Months: Avoid 72 or 84-month loans that maximize interest charges and increase negative equity risk.
- Pay Taxes and Fees Upfront: Avoid financing sales taxes, license registration, and dealer doc fees into your loan if possible.
Common Financing Situations
- ✓New & Used Car Dealership Shopping
Walk into dealerships knowing your exact monthly payment, avoiding dealer markups on interest rates or unexpected fees.
- ✓Vehicle Trade-In Evaluation
Model how positive trade-in equity reduces both your taxable purchase price and total loan balance.
- ✓Car Loan Refinancing Comparison
Compare your current auto loan APR against lower interest rates to calculate lifetime interest savings.
- ✓Budgeting with the 20/4/10 Rule
Check whether your target vehicle fits standard financial health rules: 20% down, 4-year term, and monthly expenses under 10% of income.
Why Use This Car Payment Calculator
All-Inclusive Cost Breakdown
Includes vehicle price, trade-in value, debt owed on trade-in, state sales tax, dealer doc fees, and title registration fees.
Trade-In Tax Credit Calculation
Automatically adjusts taxable price based on trade-in allowances to reflect true state tax laws.
Amortization Table
Shows year-by-year reduction of your principal loan balance and total interest paid over time.
Export & Copy Options
Easily copy payment estimates for email negotiation with dealers or download a detailed CSV amortization schedule.
Frequently Asked Questions
How is a monthly auto loan payment calculated?
Auto lenders use the standard loan amortization formula: Payment = P * [r(1 + r)^n] / [(1 + r)^n - 1], where P is the total financed amount (price + tax + fees - down payment - trade equity), r is the monthly interest rate (annual APR divided by 12), and n is total months of the loan term.
What is the 20/4/10 rule in car buying?
The 20/4/10 guideline recommends putting down at least 20% in cash, financing the vehicle for no more than 4 years (48 months), and keeping total monthly transportation costs (payment, fuel, and insurance) under 10% of your gross monthly income.
Does a trade-in reduce car sales tax?
In most US states (42 out of 50 states), your vehicle trade-in allowance is deducted from the purchase price before sales tax is calculated. For example, if a car is $30,000 and your trade-in is $10,000, you only pay sales tax on the remaining $20,000 difference.
Why should I avoid 72 or 84-month auto loans?
While longer loan terms (6 or 7 years) lower your monthly payment, you end up paying significantly more in total interest. Longer loans also keep you 'underwater' (owing more than the vehicle is worth) for years as the car rapidly depreciates.
What fees should I expect at the dealership?
Standard fees include dealer documentation fees (doc fees), state title and license registration fees, and sales tax. Optional dealer add-ons like extended warranties, paint protection, and GAP insurance can increase total financed debt if included.
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