Free down payment tool

Down Payment Calculator — How Much Should You Put Down?

Compare 0%, 10% and 20% down scenarios side by side. See exactly how your down payment changes the monthly payment, total interest and loan risk.

3 scenarios compared Interest savings Underwater risk check 100% free

Compare Down Payment Scenarios

Pick a scenario or enter a custom amount — everything updates live.

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0% down
$0
10% down
$0
20% down
$0
Monthly payment
$0
Interest saved vs 0%
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Down payment$0
Amount financed$0
Total interest$0
Total of payments$0
Underwater risk—
Down paymentAmount financed
Estimates exclude tax, title and fees for clarity — add ~8–10% for the out-the-door picture.

How Much Down Payment Do You Need for a Car?

Twenty percent is the classic target: on a $35,000 car that’s $7,000 down. It keeps your loan balance below the car’s value from day one (so you’re never “underwater”), lowers your monthly payment, and saves thousands in interest. But the right number depends on your savings, credit and the deal in front of you.

What Each Level Means

  • 0% down: highest payment, most interest, immediate negative equity. Only sensible with 0% APR manufacturer offers.
  • 10% down: a reasonable minimum — cuts interest meaningfully and usually keeps you above water after year one.
  • 20% down: the sweet spot — lowest total cost, fastest equity, best loan terms.

Don’t Drain Your Emergency Fund

A big down payment is smart only if you keep 3–6 months of expenses in savings afterward. An affordable payment with a cash cushion beats a slightly lower payment with zero reserves.

Frequently Asked Questions

Is 20% down required for a car loan?

No — many lenders allow 0–10% down. But 20% gets you better terms, lower payments and protection against owing more than the car is worth.

Does trade-in count as a down payment?

Yes. Trade-in equity reduces your amount financed exactly like cash. A $5,000 trade-in plus $2,000 cash is a $7,000 down payment.

What does it mean to be underwater on a car loan?

You owe more than the car is worth. It happens fast with $0 down because cars depreciate ~20% in year one. Being underwater traps you — you can’t sell without paying the difference.

Should I put more than 20% down?

It further lowers cost, but with diminishing returns. Money beyond 20% often earns more invested or kept as an emergency fund than it saves in interest.

Can I use a credit card for a down payment?

Most dealers allow $2,000–$5,000 on a card. Only do it if you pay the card off immediately — card interest dwarfs any auto-loan savings.

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