How Much Car Can I Afford? (The 20/4/10 Rule)
Written by
CarSavr Editorial Team
Founder & Editor-in-Chief
Reviewed by
CarSavr Editorial Team
Last updated:
6 min read
The most-cited rule in personal finance, applied to 2026 prices: 20% down, 4-year max term, 10% of monthly income (total) for all car costs.
The 20/4/10 rule
20: 20%+ down. 4: max 48-month term. 10: total monthly auto costs (loan + insurance + fuel + maintenance) under 10% of gross monthly income.
Applied to a $90k income
$90,000 gross/yr = $7,500/mo. 10% = $750/mo for total auto costs. Subtract insurance ($120), fuel ($150), maintenance ($60) = $420 left for the loan payment. At 6.5% / 48 months, $420/mo finances ~$17,800 in vehicle. Add 20% down → $22,250 total budget.
Where the rule comes from
It's a Dave Ramsey / Clark Howard classic — designed to keep car costs from crowding out retirement savings. In a 2024 NerdWallet analysis, households following 20/4/10 hit 401(k) contribution targets 3× more often than those who don't.
When the rule is too strict
If you have no other debt, max your 401(k), and have a 6-month emergency fund, you can stretch to 15% of gross. If you have student loans, credit-card debt, or no retirement savings, stick to 10% (or less).
Frequently asked questions
Does the 10% include insurance?
Yes — total monthly auto cost, including insurance, fuel, and maintenance. Just the loan payment alone should be ~6–7% of gross.
Is 48 months really the max term?
For new cars, yes — beyond 48 months, you're upside down for most of the loan. For used cars, 36 months is often safer.
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