Car Affordability Calculator
Find how much car you can afford from your income, using the 20/4/10 guide, with your down payment, loan rate and term.
Results
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Quick Answer
The 20/4/10 guide says put at least 20% down, borrow for no more than 4 years, and keep car costs under 10% of gross income. On $60,000 a year, 10% is $500 a month. At 7% over 48 months with $5,000 down, that supports a car price of about $25,880.
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Table of Contents
- Car Affordability Calculator
- Quick Answer
- Related Calculators
- How This Car Affordability Calculator Works
- How to Use the Car Affordability Calculator
- Core Formulas
- Key Terms
- Worked Example
- Real-Life Examples
- Car Affordability vs Auto Loan Calculator
- Car Price by Income
- Costs Beyond the Payment
- Common Mistakes to Avoid
- Frequently Asked Questions
- References & Sources
How This Car Affordability Calculator Works
The calculator works backward from your income. It finds a monthly car budget from the share of income you choose, takes off insurance and other costs if you enter them, and turns the rest into a loan amount using your rate and term. Your down payment is added to get the car price.
Quick explanation: car price = loan you can repay with your monthly budget + down payment.
- 20%: aim for a down payment of at least 20%.
- 4 years: keep the loan to 48 months or less.
- 10%: keep car costs under 10% of gross income.
How to Use the Car Affordability Calculator
- Enter your gross yearly income before tax.
- Enter your down payment, including any trade-in value.
- Enter the loan rate and term you expect.
- Set the share of income for car costs. 10% is the 20/4/10 guide, and some people use up to 15%.
- Optionally, enter monthly insurance and other car costs, then press Calculate.
Core Formulas
- Monthly budget: yearly income ÷ 12 × share − other car costs
- Loan amount: budget × (1 − (1 + r) ^ −n) ÷ r
- Car price: loan amount + down payment
r is the monthly interest rate and n is the number of months.
Key Terms
- 20/4/10 rule: 20% down, a loan of 4 years or less, and car costs under 10% of gross income.
- Down payment: cash or trade-in value paid up front.
- Negative equity: owing more on a loan than the car is worth.
- Out-the-door price: the full price including taxes and fees.
Worked Example
You earn $45,000, have $3,000 down, and expect $100 a month in insurance. The loan is 8.5% for 48 months, using 10% of income.
- 10% of $3,750 a month = $375, minus $100 = $275 for the payment
- Loan amount = $11,157
- Car price = $11,157 + $3,000 = $14,157
Real-Life Examples
- A first car: on $35,000 a year with $2,000 down at 9% for 48 months, 10% of income supports about $13,721.
- A family car: on $90,000 with $8,000 down at 6% for 48 months, the price is about $39,935.
- Longer loan: stretching the default example to 72 months raises the price to about $34,327, but you pay more interest and may owe more than the car is worth.
- Counting insurance: adding $150 a month of insurance to the default example drops the price to about $19,616.
Car Affordability vs Auto Loan Calculator
- This calculator: starts from your income and tells you what price to look for.
- Auto Loan Calculator: starts from a car price and tells you the monthly payment.
- Use both: set a budget here, then check a real car's payment with the Auto Loan Calculator.
Car Price by Income
| Yearly income | Monthly budget (10%) | Car price (7%, 48 mo, $5,000 down) |
|---|---|---|
| $30,000 | $250 | $15,440 |
| $40,000 | $333 | $18,920 |
| $50,000 | $417 | $22,400 |
| $60,000 | $500 | $25,880 |
| $75,000 | $625 | $31,100 |
| $100,000 | $833 | $39,800 |
| $150,000 | $1,250 | $57,200 |
Costs Beyond the Payment
- Insurance: varies widely by car, age and location.
- Fuel and charging: try our Fuel Cost Calculator.
- Maintenance: tires, oil changes and repairs add up.
- Taxes and fees: sales tax, title and registration raise the price.
Common Mistakes to Avoid
- Shopping by monthly payment alone. A long loan can hide a high price.
- Forgetting insurance. It can cost as much as a small car payment.
- Ignoring taxes and fees. Add them to the price before you buy.
- Putting little or nothing down. You may owe more than the car is worth.
- Skipping pre-approval. A bank or credit union quote helps you compare dealer offers.
Frequently Asked Questions
Using 10% of income at 7% for 48 months with $5,000 down, about $22,400.
Put at least 20% down, finance for no more than 4 years, and keep total car costs under 10% of gross income.
Yes, if you want a stricter budget. Enter it as another monthly car cost.
It lowers the payment but adds interest, and the car may lose value faster than you pay the loan down.
The 20/4/10 guide suggests at least 20%. More down lowers the loan and the interest.
No. Subtract tax and fees from the price, or add them to your loan budget, to see the car price you can pay.
A used car usually costs less and loses value more slowly, while a new car may have lower rates and a warranty. Compare the total cost of each.
Yes. A quote from a bank or credit union gives you a rate to compare with the dealer's offer.
10% is a cautious guide. Some people go up to 15% to 20% when they have few other debts.
References & Sources
| Source | Used For | Link |
|---|---|---|
| Consumer Financial Protection Bureau, Auto loans | Shopping for and comparing car loans. | https://www.consumerfinance.gov/consumer-tools/auto-loans/ |
| Wikipedia, Amortization calculator | Loan payment formula. | https://en.wikipedia.org/wiki/Amortization_calculator |