Car Affordability Calculator

How Much Car Can You Afford?

A common guideline is the 20/4/10 rule: put at least 20% down, finance for no more than 4 years, and keep total vehicle expenses (payment + insurance + fuel + maintenance) under 10–15% of gross monthly income. By this rule, someone earning $6,000/month should spend no more than $600–$900/month on total vehicle costs.

This calculator lets you work both directions: enter a target vehicle price to see the payment, or enter a target monthly payment to see the maximum vehicle price you can afford.

Frequently Asked Questions

• What percentage of income should a car payment be?
  Most financial advisors recommend keeping your car payment under 10–15% of your monthly take-home pay. If you take home $4,000/month, that's $400–$600/month. Total vehicle costs (payment + insurance + gas + maintenance) shouldn't exceed 20% of take-home.
• Is it better to put more money down on a car?
  Yes — a larger down payment reduces the financed amount, lowers monthly payments, reduces total interest, and helps avoid being "underwater" (owing more than the car is worth). Aim for at least 10–20% down on a new car.
• What is the 20/4/10 rule for buying a car?
  The 20/4/10 rule suggests: put at least 20% down, finance for no more than 4 years, and keep total vehicle expenses (payment + insurance) under 10% of gross monthly income. It's a conservative guideline designed to prevent being upside-down on a loan and to keep car costs from crowding out savings and other financial goals.
• How does my credit score affect my car loan rate?
  Credit score has a major impact. Borrowers with excellent credit (720+) typically qualify for rates of 5–7%. A fair credit score (600–660) often means rates of 10–15% or higher. On a $25,000 loan over 60 months, the difference between a 6% and 12% rate is over $4,000 in extra interest. Improving your score before buying — even by 30–60 days — can save significantly.

How Much Car Can You Afford?

A useful guardrail for car buyers is the 20/4/10 rule: put at least 20% down, finance for no more than 4 years, and keep your total monthly vehicle costs — payment plus insurance — at or below 10% of your gross monthly income. The rule exists because cars are depreciating assets, and stretching a loan to 6 or 7 years to afford a pricier vehicle often leaves you "underwater," owing more than the car is worth. This calculator works backward from your budget to the price range that keeps you on solid footing.

Worked Example

If you earn $6,000 a month gross, the 10% ceiling caps your total car spending at $600, and after roughly $150 for insurance that leaves about $450 for the loan payment. At a 7% rate over 48 months, a $450 payment supports a loan of around $18,800; add a 20% down payment and you're shopping in the low-to-mid $20,000s. Push the term to 72 months and you could "afford" a higher price on paper — but you'd pay more interest and spend years underwater, which is exactly what the rule is designed to prevent.

Don't Forget the Running Costs

The monthly payment is only part of car ownership. Insurance, fuel, registration, and maintenance can add hundreds of dollars a month, and they vary widely by vehicle. A cheaper car that's expensive to insure or thirsty at the pump can cost more overall than a pricier, efficient one. Before committing, fold those running costs into your budget — and remember that buying below your maximum leaves room for the unexpected repair that eventually comes for every vehicle.

• What is the 20/4/10 rule?
  It suggests 20% down, a loan no longer than 4 years, and total vehicle costs (payment plus insurance) under 10% of gross monthly income — a guideline to avoid overextending on a depreciating asset.
• Is a longer loan term a bad idea?
  Longer terms lower the monthly payment but increase total interest and keep you underwater longer. They can make sense in moderation, but stretching to 72 or 84 months to afford a more expensive car is risky.
• Should I include insurance in my car budget?
  Yes. Insurance is a recurring cost that varies a lot by vehicle and driver. Factoring it in gives a realistic picture of what a car truly costs each month.