Auto Loan Calculator
Calculate monthly payments and total cost
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Understanding Auto Loans: A Complete Guide
How Auto Loan Interest Works
Auto loans use simple interest calculated on the remaining principal balance. Each monthly payment is split between interest and principal — early payments are heavily weighted toward interest. A 6% rate on a $30,000 loan means about $150 of your first payment goes to interest and only about $393 goes to principal. By the final payment, nearly all of it reduces principal.
The formula used by this calculator: M = P × [r(1+r)n] / [(1+r)n - 1] where M = monthly payment, P = loan amount, r = monthly rate, n = total months.
New vs Used Car Rates Comparison
Key insight: A 2-3 year old used car typically costs 20-30% less than the same model new, with most of the depreciation already absorbed by the first owner. This is the sweet spot for value-conscious buyers.
Total Cost of Ownership: Beyond the Monthly Payment
The monthly payment is just one part of car ownership costs. Factor in these additional expenses:
- Insurance — $1,200-$3,600/year for full coverage. Newer and sportier cars cost more to insure.
- Depreciation — The biggest hidden cost. A $40,000 car loses $8,000-$12,000 in year one alone.
- Maintenance — $500-$1,500/year average. Older cars cost more; luxury brands cost significantly more.
- Fuel — $1,200-$3,000/year depending on mileage and fuel efficiency. Electric vehicles reduce this to $300-$600/year.
- Registration and taxes — Varies by state, typically $200-$800/year.
A $35,000 car with a $600/month payment actually costs closer to $900-$1,000/month when all ownership costs are included.
Tips for Getting the Best Auto Loan Rate
- Get pre-approved before dealership shopping — Credit unions and online lenders often beat dealer financing by 0.5-1.5%. A 1% rate difference on a $30,000 loan saves $900 over 5 years.
- Improve your credit score — Scores above 700 get the best rates. Pay down credit cards and avoid new credit applications 3-6 months before buying.
- Make a larger down payment — 20% down eliminates negative equity risk and may qualify you for better rates. Put at least 10% down to avoid being "upside down."
- Choose a shorter loan term — 48-60 months is optimal. 72-84 month loans have higher rates and you pay thousands more in interest. A $30,000 loan at 6% costs $4,800 in interest over 60 months vs $7,200 over 72 months.
- Consider certified pre-owned (CPO) — CPO vehicles come with manufacturer warranties at used car prices. You get new car reliability at 15-25% lower cost.
- Negotiate the car price, not the payment — Dealers manipulate monthly payments by extending loan terms. Always negotiate the out-the-door price first.
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Written by Finance Experts · Last updated September 2026
Frequently Asked Questions
What credit score do I need for an auto loan?
Most lenders prefer 660+ for good rates. Scores above 700 get the best rates (5-7%). Below 600, expect rates above 10-15%. Credit unions often offer more favorable terms than dealerships for borrowers with fair credit.
Should I get a new or used car loan?
Used car rates are typically 0.5-1.5% higher, but used cars cost 20-30% less. A 2-3 year old used car is the sweet spot — most depreciation has occurred, the car is still reliable, and you save thousands.
How long should my auto loan term be?
48-60 months is optimal. Longer terms (72-84 months) have higher rates and you pay thousands more in interest. A $30,000 loan at 6% costs $4,800 in interest over 60 months vs $7,200 over 72 months.
What is negative equity (being upside down)?
Negative equity means you owe more on the car than it is worth. This happens with long loan terms, small down payments, or rapid depreciation. Put at least 10-20% down to avoid this.
Should I finance through the dealer or get pre-approved?
Always get pre-approved before visiting the dealership. Credit unions and online lenders often beat dealer financing by 0.5-1.5%. A 1% rate difference on a $30,000 loan saves $900 over 5 years.
How much should I put down on a car?
Put at least 10-20% down to avoid negative equity and get better rates. 20% down eliminates the risk of being upside down. A larger down payment also means a smaller loan and less total interest.
Can I refinance my auto loan?
Yes, if your credit score has improved or rates have dropped. Refinancing a $25,000 balance from 8% to 5% saves about $750 over the remaining term. Check for prepayment penalties before refinancing.
What is the total cost of car ownership?
Beyond the monthly payment, budget for: insurance ($1,200-$3,600/yr), maintenance ($500-$1,500/yr), fuel ($1,200-$3,000/yr), registration ($200-$800/yr), and depreciation (biggest cost — $4,000-$8,000/yr for a new car).
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Current Mortgage Rates
Rates updated daily via Bankrate.com
When to Use This Calculator
Use this calculator when shopping for a home with Zillow or Redfin, comparing loan offers from different lenders, deciding between a 15-year and 30-year term, evaluating whether to put 20% down to avoid PMI, or planning your monthly housing budget.
How This Calculator Works
Enter your home price, down payment, interest rate, and loan term. The calculator computes your monthly payment using the standard amortization formula, then adds estimated property taxes (based on your state's effective rate from the Census Bureau), homeowners insurance, and PMI using 2026 industry averages.
Real-World Example: Buying a $400,000 Home
- Loan amount: $360,000
- Monthly P&I: $2,275
- PMI (0.7%): $210/month
- Property tax (1.1%): $367/month
- Insurance: $150/month
- Total monthly: $3,002
- Total interest over 30 years: $419,131
- Total cost (including down payment): $459,131
Historical Mortgage Rates (1971-2026)
Source: Freddie Mac Primary Mortgage Market Survey
When to Use This Calculator
- Comparing loan options: See the difference between 15-year and 30-year terms
- Refinancing decisions: Calculate your break-even point
How Mortgage Payments Are Calculated
- Principal: The portion that pays down your loan balance
- Insurance: Homeowners insurance, also escrowed monthly
Where M = monthly payment, P = loan amount, i = monthly interest rate (annual rate / 12), n = total number of payments (years × 12).
Fixed-Rate vs Adjustable-Rate Mortgage (ARM)
Closing Costs: What to Expect
Private Mortgage Insurance (PMI) Explained
Real-World Example: $400,000 Home Purchase
- Loan amount: $360,000
- Principal & Interest: $2,275/mo
- Property tax (1.8%): $600/mo
- Homeowners insurance: $175/mo
- PMI (0.6%): $180/mo
- Total monthly payment: $3,230
- Down payment: $40,000
- Closing costs (3%): $12,000
- Total cash needed at closing: $52,000
When Refinancing Makes Sense
- The rate drop is large enough to matter. A useful starting point is at least one percentage point below your current auto loan rate; smaller drops often get eaten by fees.
- You keep the car past the break-even point. Example: $20,000 remaining at 8% with 60 months left, refinanced to 6%, lowers the payment from about $406 to $387. A $400 refinance fee is recovered in roughly 21 months — sell or total the car before that and the refinance cost you money.
- You are not stretching the term to cut the payment. Stretching 48 remaining months into 72 lowers the monthly bill but raises total interest; check the total-paid figure before signing.
- Your credit profile improved. Auto rates are priced on credit, so a score jump of 40 or more points usually justifies a fresh quote even if you applied recently.
- There is no prepayment penalty. Read the current loan payoff terms first; a penalty can cancel an otherwise-cheap refinance.
Data Sources & Citations
- OfficialInternal Revenue Service (IRS)
Disclaimer: Calculators and tools on this site are for informational purposes only and do not constitute financial, tax, legal, medical, or investment advice. Results are estimates and may not reflect actual rates or terms. Consult a qualified professional before making decisions. Privacy Policy
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