Car Down Payment: How Much Should You Put Down?
The rule of thumb for a car down payment is 20% of the purchase price. But many buyers put down far less — and it costs them.
Here's what different down payments actually do to your monthly payment and total interest.
Why the Down Payment Matters
Your down payment is cash you pay today to reduce the amount you finance. A bigger down payment means:
- A smaller loan
- A lower monthly payment
- Less total interest
- And you're less likely to be underwater (owing more than the car is worth)
The Numbers: $30,000 Car, 6% APR, 60 Months
| Down payment | Amount financed | Monthly payment | Total interest |
|---|---|---|---|
| $0 (0%) | $30,000 | $580 | $4,799 |
| $3,000 (10%) | $27,000 | $522 | $4,319 |
| $6,000 (20%) | $24,000 | $464 | $3,839 |
Going from 0% to 20% down saves you about $116 per month and roughly $960 in total interest.
💡 Try different down payments: Use the auto loan calculator and toggle the down payment between dollars and percent to see the difference instantly.
Why 20%?
Cars depreciate about 20% in the first year. If you put 20% down, you stay roughly even with the car's value from day one — so you're not underwater if you need to sell or trade it early.
With 0% down, you owe the full price while the car is already losing value. The gap can reach thousands of dollars within months.
What If You Can't Put 20% Down?
- Aim for at least 10% — it's the minimum that keeps you from falling too far behind depreciation.
- Consider a cheaper car — a $20,000 car with 10% down beats a $30,000 car with 0% down on every metric.
- Never roll negative equity from an old car into a new loan — it makes the underwater problem worse.
Frequently Asked Questions
What is a good down payment percentage for a car?
20% is ideal, 10% is the minimum most experts recommend. More is always better if you have the cash.
Is it better to put more down or pay the car off faster?
Both help, but a larger down payment helps more because it reduces the loan from the start, so you pay less interest every single month.
Should I put cash down or keep it as an emergency fund?
Keep a small emergency fund first (1–3 months of expenses). After that, a bigger down payment usually beats holding cash that earns less than your car loan's APR.
See exactly what your down payment does with the RateLedger auto loan calculator.