Start with what fits your monthly budget
The most common mistake first-time buyers make is starting with the car and working backwards into a payment. The math usually breaks: long terms, marked-up rates, and add-ons fill the gap, and the buyer pays thousands more in interest than they planned.
Flip the calculation. Pick a monthly payment you’re comfortable with, lock in a term that doesn’t stretch beyond five or six years, and use the calculator to see what vehicle price that produces at your credit tier. That number — not the dealership’s upsell — is your real budget.
A simple rule of thumb: 20/4/10
- 20% down. A 20% down payment cuts your loan principal, drops your monthly payment, and protects you from going underwater on the loan if the vehicle depreciates.
- 4-year term. Anything longer adds interest cost and increases the chance you’ll owe more than the car is worth halfway through.
- 10% of gross income for total transportation costs (loan payment, insurance, fuel, and maintenance combined).
These are guidelines, not rules. Strong credit, stable income, and a longer planning horizon give you room to deviate. But starting from the rule keeps you grounded.
Frequently asked
How much car can I afford on my salary?
A common rule of thumb is to keep total auto expenses (loan payment, insurance, fuel, maintenance) under 15-20% of your take-home pay. For a $60,000 salary, that's roughly $625-$830 per month for everything car-related.
What's the 20/4/10 rule for auto loans?
Put 20% down, finance for no more than 4 years, and keep total transportation costs under 10% of your gross income. It's a conservative guideline that leaves room in your budget for life.
How does my credit score affect what I can afford?
A higher credit score typically lowers your APR, which lowers your monthly payment for the same loan amount. The same $25,000 loan at 4.5% vs 12% APR is a difference of about $90/month over 60 months.
Should I use my full pre-approved amount?
Not necessarily. Your pre-approval is the maximum a lender will lend you — it's not a target. Buying less car than you can afford keeps your monthly cost down and gives you a buffer if your situation changes.
Ready to see real numbers
Run your scenario through the calculator
No signup, no credit pull. Adjust the inputs to match your situation and see the monthly payment, total cost, and amortization schedule.