Car Affordability Calculator
How much car you can afford based on income, debts, and budget
Buy smart, not just what you can squeeze
A payment you can technically afford and a payment that leaves your finances healthy are very different numbers. This calculator finds the right one.
Max purchase price
Get the car price ceiling that fits your income, not just a monthly number to chase.
DTI check
Factors in your existing debts so the new payment does not push your debt-to-income ratio too high.
Down + trade-in
Include your down payment and trade-in value for a realistic max loan amount.
Conservative vs max
See both the 15% (conservative) and 20% (maximum) thresholds side by side.
Rate & term options
Adjust the interest rate and loan term to model different financing scenarios.
100% private
Your income and debt details stay in your browser — nothing is sent anywhere.
When to use it
Before shopping
Know your number before the dealership sets it for you.
Budget planning
Fits a car payment into a broader monthly budget with other goals.
Replacing a car
Understand what you can step up — or need to step down — to.
First car
Especially useful for first-time buyers who have no baseline to compare.
Frequently Asked Questions
How much car can I afford?
Most financial advisors recommend keeping your car payment at or below 15% of gross monthly income (conservative) or 20% (maximum). On $6,000/month gross income, that is $900–$1,200/month. But that ceiling assumes all your other debt payments leave room — if you already have significant debt, your real cap may be lower based on your debt-to-income ratio.
What is the 20/4/10 rule for car buying?
Put at least 20% down, finance for no longer than 4 years, and keep total transportation costs (payment, insurance, fuel, maintenance) under 10% of gross income. The 4-year term keeps you from going significantly underwater on a depreciating asset, and 20% down reduces the chance of owing more than the car is worth.
Should I include insurance costs in my car budget?
Yes — insurance, fuel, and maintenance can add hundreds per month to the true cost of ownership. A rough guide: budget an additional 10–20% of the sticker price per year for total running costs. A $30,000 car might cost $3,000–$6,000/year in ownership costs beyond the loan payment.
Does a bigger down payment help affordability?
Significantly. A larger down payment reduces the loan amount, which lowers both the monthly payment and the total interest paid. It also reduces the risk of being "upside down" — owing more than the car is worth — especially early in the loan when depreciation is fastest. If you can put 20% down, you start the loan with meaningful equity.
Is a longer loan term better for affordability?
A longer term (e.g., 72–84 months) lowers the monthly payment but increases total interest paid and keeps you in debt longer on a depreciating asset. This raises the risk of being upside down for much of the loan's life. Aim for the shortest term where the payment remains affordable — ideally 48–60 months — to minimize total cost and stay ahead of depreciation.
Understanding Car Affordability
The question "how much car can I afford?" has two very different answers: what a lender will approve, and what actually makes financial sense. Lenders will approve you for far more than is wise, because their incentive is to loan money, not to protect your budget. The affordability guidelines used by financial planners — not lenders — are what this calculator applies.
The 15%/20% income rule
Most personal finance advisors recommend keeping monthly car payments below 15% of gross income (the conservative target) and 20% as an absolute maximum. On a $6,000/month gross salary, that means $900–$1,200 in monthly payment. The 15% figure leaves more room for savings and other goals; 20% is the ceiling before a car payment starts crowding out financial health.
Depreciation and being underwater
A new car loses roughly 15–25% of its value in the first year and 50% or more over five years. If you finance with a small down payment over a long term, you will owe more than the car is worth for much of the loan — called being "underwater" or "upside down." This becomes a problem if you need to sell, trade in, or the car is totaled. A larger down payment and a shorter term both protect you from this trap.
Total cost of ownership
The loan payment is only part of what a car costs. Insurance, fuel, maintenance, tires, and registration fees add significant amounts — often $200–600/month depending on the vehicle. A true affordability calculation accounts for all of these, not just the payment. This is why a slightly less expensive car with lower insurance and fuel costs often makes more financial sense than a newer, cheaper-seeming loan payment on a more expensive vehicle.