Should You Buy This Vehicle? A True-Cost Affordability Check
Share
Buying a vehicle is one of the largest financial commitments most people make. Dealership offers can feel urgent, and it's easy to focus on the monthly payment without accounting for the full cost of ownership — insurance, fuel, maintenance, and your existing debt load.
This decision-support tool helps you pressure-test any vehicle offer against your actual take-home income. Enter your numbers below to get a quick affordability signal before you sign anything.
This is a decision-support tool, not financial advice. Always review your full budget and consult a financial professional before making major purchases.
Your numbers
How the estimate works
DCT uses a 15% of monthly take-home income target for total monthly vehicle costs as a conservative experimental benchmark. DCT selected the lower end of NerdWallet's current guidance that total vehicle expenses are best kept below roughly 15%–20% of take-home pay, when possible.
The tool separately checks the proposed vehicle payment against NerdWallet's general guideline of keeping the payment below about 10% of monthly take-home pay, when possible.
“True monthly vehicle cost” in this prototype includes the proposed payment, insurance, fuel/charging, and a maintenance reserve. The CFPB recommends considering more than the monthly payment when assessing affordability, including costs such as interest, insurance and routine maintenance.
These percentages are general budgeting reference points, not universal affordability rules. Housing, savings, family expenses, other debt, vehicle type and individual circumstances can materially change what is affordable.
Sources & methodology
Consumer guidance on calculating the true cost of a vehicle, including up-front costs and recurring costs such as interest, insurance and routine maintenance.
CFPB — How much can I afford to borrow for a car or auto loan?
Consumer guidance identifies actions that can reduce monthly and overall borrowing costs, including a larger down payment, purchasing a less expensive vehicle, and reducing add-ons/options.
CFPB — What should I know before I shop for a car or auto loan?
Current consumer budgeting guidance recommends, when possible, keeping the car payment below about 10% of monthly take-home pay and overall vehicle expenses below roughly 15%–20%. DCT's 15% target is intentionally the conservative end of that range.
NerdWallet — What Is the Total Cost of Owning a Car?
AAA's annual research evaluates the broader cost of owning and operating a vehicle. Its 2025 analysis reported an average new-vehicle ownership and operating cost of $11,577 per year ($964.78 per month); actual costs vary substantially by vehicle and driver.
AAA — 2025 Your Driving Costs
Methodology note: the 15% DCT target is an experimental decision-support benchmark chosen from published consumer budgeting guidance. It is not a CFPB rule, lender underwriting standard, regulatory threshold, or guarantee that a particular vehicle is affordable.