How Much Should I Spend on a Car? The 15% Rule Explained

One of the most common financial mistakes Americans make is overspending on a car. The average new car payment hit $735/month in 2024 — a crushing number for most budgets. Financial experts have a simple rule to prevent this: spend no more than 15% of your gross monthly income on all car-related costs combined.

What Is the 15% Rule?

The 15% rule says your total monthly car costs — loan payment, insurance, gas, and maintenance — should not exceed 15% of your gross (pre-tax) monthly income. Some stricter advisors say 10%. If you earn $5,000/month before taxes, your total car costs should stay under $750/month.

• Monthly loan/lease payment
• Car insurance premium
• Gas and fuel costs
• Oil changes, tires, and routine maintenance

How to Calculate Your Car Budget

1. 1Find your gross monthly income (annual salary ÷ 12)
2. 2Multiply by 0.15 to get your total car budget
3. 3Subtract estimated insurance ($150/mo), gas ($130/mo), maintenance ($80/mo)
4. 4The remainder is your maximum monthly car payment

Example: $6,000/month income × 15% = $900 total budget. Subtract $360 in operating costs = $540 maximum monthly payment. At 7% APR over 60 months, that supports roughly a $27,000 car purchase.

The True Cost of Car Ownership

Most people only think about the sticker price or monthly payment. But the true cost of ownership includes a lot more. AAA estimates the average new car costs $12,182 per year to own and operate — that's over $1,000/month before you even consider the loan.

• Depreciation: New cars lose 20–30% of value in the first year
• Insurance: Averages $1,700/year for full coverage on a new car
• Fuel: Varies by vehicle, but averages $1,500–$2,500/year
• Maintenance and repairs: Budget $1,000–$2,000/year for older vehicles
• Registration and taxes: $200–$600/year depending on state

When It's OK to Spend More

The 15% rule is a guideline, not a law. It's okay to stretch slightly if your car is a genuine work tool (you're a realtor, contractor, or delivery driver) and the vehicle directly generates income. It's also acceptable if you have no other debt and a fully funded emergency fund.

What's never okay: financing a car you can't afford because 'the payments seem manageable.' Payments are manageable until they aren't — and cars are depreciating assets that lose value the moment you drive off the lot.

How to Afford More Car on the Same Budget

• Buy used: A 2-3 year old car has already absorbed the worst depreciation and costs 30–40% less
• Put more down: A larger down payment reduces the loan amount and monthly payment
• Improve your credit score: A difference of 100 points in credit score can change your APR by 3–4%, saving thousands
• Shop for insurance before buying: Some vehicles cost dramatically more to insure than others
• Consider a shorter loan term: 48-month loans have higher payments but cost far less in interest than 72-84 month loans