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Auto & Personal Loan Calculator

Accurate monthly payment estimates for US auto and personal loans. Factor in your trade-in, local sales tax, and dealer fees in real-time.

Last updated: · Reviewed by Shakeel Alvi, OtherCalculators

1. Basic Information

$
%

2. Trade & Down Payment

$
$

3. Taxes & Fees

%
$

In many US states, sales tax applies to the price after your trade-in is deducted.

Estimated Monthly Payment

$527.19
Financed Amount$27,600.00
Total Interest$4,031.52
Total Paid$31,631.52

Purchase Price

$30,000.00

Down + Trade

$5,000.00

Sales Tax (7%)

$2,100.00

Dealer Fees

$500.00

Payment Schedule (First Year)
MonthPrincipalInterestBalance
1$400.69$126.50$27,199.31
2$402.53$124.66$26,796.78
3$404.37$122.82$26,392.41
4$406.23$120.97$25,986.18
5$408.09$119.10$25,578.09
6$409.96$117.23$25,168.13
7$411.84$115.35$24,756.29
8$413.73$113.47$24,342.57
9$415.62$111.57$23,926.95
10$417.53$109.67$23,509.42
11$419.44$107.75$23,089.98
12$421.36$105.83$22,668.61

And 48 more months…

US Lending Tips

  • Credit Score Impact

    A score above 740 typically unlocks the lowest rates in the US market.

  • Down Payment Rules

    Putting 20% down often helps avoid negative equity (owing more than the item is worth).

  • Pre-Approval

    Always get pre-approved by your credit union or bank before dealership visits.

Pro-tip: aim for a total monthly car payment under 10–15% of your take-home pay.

Estimates are based on your inputs and common US tax laws. Actual rates may vary by state and lender.

Quick answer

A US auto or personal loan payment is set by the standard amortization formula from three inputs: the amount financed, the APR, and the term. Financing $32,950 at 6% APR over 60 months works out to about $637 a month. Your APR depends heavily on your credit score, and in most states a trade-in reduces the taxable purchase price.
Guide

How this calculator works

Our tool uses the standard US amortization formula to determine your exact monthly payment. Unlike simple calculators, we integrate: tax credits — deducting trade-in value from your taxable purchase price; US dealer fees — adding common documentation and processing fees to the principal; and a flexible APR — simulating real-world interest rates used by US lenders.

A vehicle or personal purchase rarely stands alone. Compare this payment against a home loan with the mortgage payoff calculator, weigh a big-ticket purchase like an aircraft with the aircraft finance calculator, or see how borrowing from retirement compares using the 401(k) loan calculator.

How the maths works

The loan formula

M = P × [ r(1 + r)ⁿ ] ÷ [ (1 + r)ⁿ − 1 ]

M is the total monthly payment, P the principal loan amount (the financed sum), r the monthly interest rate (annual rate ÷ 12), and n the number of months in the term.

Worked example

Worked example

Example — a $35,000 car with a $5,000 down payment

Purchase price:
$35,000
Down payment:
$5,000
APR / Term:
6.0% / 60 months
Sales tax / Fees:
7% / $500
  1. Principal before tax: $35,000 − $5,000 = $30,000
  2. Sales tax (price − trade-in): $35,000 × 7% = $2,450
  3. Total financed amount: $30,000 + $2,450 + $500 = $32,950
  4. Monthly rate: 6.0% ÷ 12 = 0.5%

Estimated monthly payment: ≈ $637 / month

Sales tax applies to the purchase price minus any trade-in — not minus the down payment — which is why the taxable amount here is $35,000, not $30,000.

Key facts

  • A US auto loan payment follows the amortization formula M = P · r(1+r)ⁿ / ((1+r)ⁿ − 1), where P is the amount financed, r the monthly interest rate, and n the number of months.
  • In many US states, sales tax is charged on the price after the trade-in is deducted, so a trade-in lowers both the amount financed and the tax owed.
  • APR includes lender fees and prepaid interest on top of the nominal interest rate, giving a truer picture of the total cost of borrowing than the interest rate alone.
  • The 20/4/10 rule of thumb suggests putting 20% down, financing for no more than four years, and keeping total vehicle costs under 10% of gross monthly income.
FAQ

Frequently Asked Questions

What is a good APR for a car loan in the US?

This depends on your credit score. Generally, 'Prime' borrowers (700+) see rates between 4% and 7%, while 'Subprime' borrowers may see rates exceeding 15%.

How does a trade-in affect my loan?

A trade-in reduces the purchase price of your new vehicle. In many US states, you only pay sales tax on the net price (purchase price minus trade-in), saving you significant money.

What is the difference between APR and interest rate?

The interest rate is the cost to borrow the principal. The APR (Annual Percentage Rate) includes the interest rate plus any dealer fees or prepaid interest, giving a more accurate total cost of borrowing.

Can I pay off my loan early?

In the United States, most modern auto and personal loans do not have prepayment penalties, but you should always check your specific contract to be sure.

How much down payment do I need?

While some lenders offer $0 down, a standard recommendation is 20%. This helps prevent 'negative equity' where you owe more than the asset is worth.

Are dealer fees mandatory?

Some fees like 'Documentation' or 'Processing' fees are common and often non-negotiable at dealerships, but others like 'Added Accessories' or 'Market Adjustments' can be contested.

How does a credit score impact my loan?

Lenders use your credit score to determine risk. A higher score unlocks lower APRs, while a lower score can lead to higher monthly payments and total interest costs.

What is the 20/4/10 rule for car buying?

It's a common rule of thumb for US car buyers: put 20% down, finance for no more than 4 years (48 months), and keep total car costs under 10% of your gross monthly income.

Keep going

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Mortgage Payoff CalculatorCalculate how extra mortgage payments, biweekly payments, and lump sums can reduce your mortgage term and save interest.Aircraft Finance CalculatorMonthly payment, total interest and amount financed on an aircraft loan, from price, down payment, optional sales tax, rate and term.401k Loan CalculatorCalculate your 401(k) loan monthly payment, full amortization schedule, and the real opportunity cost of borrowing from your retirement account. Follows US IRS §72(p) rules including the $50,000 cap and 5-year maximum term.

Assumptions

  • Interest compounding is monthly.
  • First payment starts 30 days after financing.
  • Sales tax applies to (Price − Trade Value).
  • No prepayment penalties are included.

This loan calculator is for informational purposes only and does not constitute financial advice. Actual loan terms and rates are determined by individual lenders and state regulations.