The question "how much car can I afford?" sounds like it should be answered by a sticker price, but it is really answered by a monthly payment. The dealer will happily approve you for more car than your budget can comfortably carry, so the safest number to shop from is the one you work out before you walk in: a car price derived from your own income and running costs.
This calculator takes your monthly take-home pay, applies the classic affordability rule of thumb that all car costs should stay around 15% of income, subtracts the fixed costs you cannot avoid — insurance, fuel and maintenance — and then back-solves the loan principal the remaining payment can support. Add your down payment and trade-in, and you get the actual maximum car price you can afford without straining your budget. Adjust any field and every figure updates instantly.
How to Use
- Enter your Monthly Take-Home Income. Use what actually lands in your bank account each month, or your gross household income — just be consistent.
- Set the Car Budget Share of Income. The default 15% keeps the total cost of the car comfortable; 20% is the ceiling most advisors recommend you not exceed.
- Add the three fixed running costs: Car Insurance, Fuel / Charging, and Maintenance & Repairs. These come out of the budget before any loan payment, so leaving them out inflates the car you think you can afford.
- Enter your Down Payment and Trade-In Value. Cash and equity reduce the amount you must finance, which raises the car price you can afford while keeping the same monthly payment.
- Choose the Loan Term — 36, 48, 60 or 72 months — and your Interest Rate (APR). Longer terms lower the payment but add interest; a higher rate shrinks the loan principal your payment can buy.
The result card shows your total monthly car budget, the fixed operating costs, the maximum monthly car payment, the maximum loan amount it supports, and the max car price once your down payment and trade-in are added. It also shows the total interest over the loan term and the payment as a percentage of your income.
The 15% Rule and the Math Behind It
Personal finance advisors often suggest keeping all of your car-related spending — payment, insurance, fuel, maintenance — at roughly 15% of your net monthly income. On a $6,000 monthly income that is a $900 car budget. If insurance runs $120, fuel $150 and maintenance $80, those fixed costs already take $350, leaving only $550 for the actual car payment.
That $550 is then converted into a loan principal using the standard amortization formula, the same one lenders use in reverse:
P = M × ((1 + r)ⁿ − 1) / (r × (1 + r)ⁿ)
Where M is the monthly payment, r is the monthly interest rate (the APR divided by 12), and n is the number of monthly payments. At an 11.5% APR over 60 months, a $550 payment supports a loan of about $25,008. With no down payment or trade-in, that is your max car price. If the APR were 0%, the formula divides by zero, so the engine simply splits the payment evenly across the number of months: $550 × 60 = $33,000 of principal.
Notice how sensitive the price is to the inputs. Raise the budget share to 20% and the payment climbs to $850; shorten the term to 48 months and the price falls; put $5,000 down and the affordable sticker price rises by exactly $5,000. Running these scenarios before you shop is what keeps you out of a payment you regret.
Examples
Example 1 — The default profile. A buyer nets $6,000 a month, keeps 15% for the car, and budgets $120 for insurance, $150 for fuel and $80 for maintenance. The total budget is $900, fixed costs are $350, and the max monthly payment is $550. At 11.5% over 60 months that supports about $25,008 of loan, and with $0 down the max car price is $25,008. Over the loan they pay roughly $7,992 in interest.
Example 2 — Down payment in action. Same $550 payment, but the buyer has $6,000 cash and a $4,000 trade-in. The loan principal stays near $25,008, but the max car price becomes $35,008 — the same monthly bite, a much nicer car on the windshield. This is why dealers ask about trade-ins up front.
Example 3 — Tight budget. A student on a $4,000 monthly income holds the car to 10% ($400) and spends $100 on insurance, $100 on fuel and $50 on maintenance. That leaves only $150 a month for the payment. Over 48 months at 0% dealer financing, the affordable car price is $7,200 — a reliable used car, not a new one.
Example 4 — High earner, stress test. A household nets $1,000,000 a month in this extreme boundary case. Even holding the 15% rule, the supported loan runs into the millions; the point is that the engine handles magnitudes far beyond normal without breaking.
FAQ
How much car can I afford based on my salary?
Multiply your monthly take-home pay by 15% to get your total car budget, then subtract insurance, fuel and maintenance. The remainder is what you can put toward a payment. On a $6,000 monthly income, that is $900 minus about $350 of running costs = roughly $550 a month, which supports a car near $25,000 with a typical loan.
Is 15% of income too much or too little for a car?
Fifteen percent is a comfortable middle: it leaves room for savings, rent and other bills while still allowing a reliable vehicle. Twenty percent is the commonly cited ceiling, and anything above it is risky if your income is variable. If 15% only buys a car you dislike, extending the term or saving for a larger down payment is safer than stretching the percentage.
Should I put money down or keep it in savings?
A down payment raises the car price you can afford at the same monthly cost and reduces interest, but you should keep an emergency fund of three to six months of expenses before sinking cash into a depreciating asset. A 10–20% down payment is the usual sweet spot; more than that only makes sense if your emergency fund is already solid.
How does a longer loan term change what I can afford?
A longer term spreads the same payment across more months, so it supports a higher loan principal — but you pay more total interest and you are "underwater" (owing more than the car is worth) for longer. Going from 48 to 72 months can raise the affordable price by 30% or more, at the cost of thousands in extra interest.
Does my credit score change the car price?
Indirectly, yes. A lower credit score means a higher APR, and a higher APR shrinks the loan principal your fixed monthly payment can support. Raising your score before applying, or adding a co-signer, can lower the rate and buy you a noticeably better car for the same monthly payment.
What is the difference between a car payment and total car cost?
The payment is only the loan installment. Insurance, fuel, maintenance, repairs and registration are paid on top of it every month. Budgeting for the payment alone — not the total — is the most common reason people feel "car poor" after they buy.
Disclaimer
This how-much-car-can-I-afford calculator is provided for informational purposes only and does not constitute financial, lending, or tax advice. Estimates are based on the inputs you enter and the standard amortization formula; actual loan offers vary by lender, credit profile, location, and program. Insurance, fuel, and maintenance figures are approximations. Always confirm your final payment, rate, and terms directly with a licensed lender or dealer before committing to a vehicle.