Short answer
Most guidelines suggest at least 20% down. On a $30,000 car that is $6,000, which gives a payment of about $569 over 48 months at 6.5%.
1. Why 20%
New cars can lose around 20% of their value in the first year. A 20% down payment helps keep the loan balance at or below the car's value, so you are less likely to owe more than it is worth, especially on longer loans.
2. $30,000 car at 6.5% over 48 months
| Down payment | Cash down | Financed | Monthly payment | Total interest | Balance after 12 payments |
|---|---|---|---|---|---|
| 0% | $0 | $30,000 | $711 | $4,150 | $23,213 |
| 10% | $3,000 | $27,000 | $640 | $3,735 | $20,892 |
| 20% | $6,000 | $24,000 | $569 | $3,320 | $18,570 |
| 30% | $9,000 | $21,000 | $498 | $2,905 | $16,249 |
If the car loses 20% of its value in the first year, it is worth about $24,000 after 12 months. On a 48-month loan, 0% down leaves you owing about $23,213 against a value near $24,000, so there is almost no cushion. With 20% down you owe about $18,570, a cushion of about $5,430. The risk of owing more than the car is worth is bigger on 72- and 84-month loans, where the balance falls more slowly.
3. How the calculator uses your down payment
The calculator keeps your down payment at no less than 20% of the price. A down payment of $5,000 caps the price at $25,000, and $8,000 caps it at $40,000.
4. If you cannot reach 20%
- Buy a cheaper car, so that your down payment is 20% of its price.
- Add a trade-in or save longer.
- If you put less down, choose a shorter term to build equity faster.
5. Frequently asked questions
How much should I put down on a car?expand_more
At least 20% is the usual guideline. On a $30,000 car that is $6,000.
Can I buy a car with no down payment?expand_more
Yes, but you finance the full price, pay more interest and have little cushion if the car loses value quickly, especially on a longer loan.
Does a trade-in count as a down payment?expand_more
Yes. Its value reduces the amount you finance in the same way as cash.
What happens if I put down less than 20%?expand_more
Your payment and interest are higher, and you have less cushion if the car loses value quickly, especially on a longer loan.