Car Loan Calculator — Monthly Payment & True Cost
Calculate your exact monthly car payment including sales tax, fees, and trade-in. See the total true cost of ownership.
Monthly Payment
$667
Loan Amount
$33,300
Sales Tax
$2,800
Total Interest
$6,736
True Total Cost
$45,036
True Cost Breakdown
Loan Balance Over Time
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This tool is for educational purposes only and does not constitute financial, tax, or investment advice. Consult a qualified financial professional for advice specific to your situation.
Analysis & insights
Your monthly payment is $0 over 60 months at 7.5% APR — total interest paid: $6,736. Your loan-to-value is 100.0% (zero down). Reasonable financing — modern standard. You'll be above water within 18-24 months. Always shop your bank/credit union before accepting dealer financing — typical rate difference is 1-2 percentage points.
Typical auto loan
Standard 60-month financing at market rate. Most US auto loans fall in this range.
Risk & benchmark gauge
Current band
Standard
60-month term at 7.5%
Industry benchmarks
- Monthly payment$0
- Total interest$6,736
- Loan-to-value100.0%
- Term60 months
- Rate7.5%
- Average new car loan APR (2025)7.5-8.5%
- Average used car loan APR11-13%
Key insights
Cars depreciate ~20% year 1, ~50% by year 5
A new $40K car is worth ~$20K after 5 years. If you took a 72+ month loan, you'll be underwater (owe more than the car is worth) for years. Hard to sell, expensive to total.
The 20/4/10 rule
Industry guideline: 20% down + 4-year max loan + total transportation cost under 10% of monthly income. Following all three keeps you out of car-loan trouble.
Pre-approval gives you negotiation power
Get pre-approved at your credit union or bank BEFORE going to the dealer. Their financing department often pads the rate by 1-2 points to capture extra profit.
Recommended actions(4)
Shop financing at your bank/credit union FIRST
High priorityCredit unions typically beat dealer rates by 1-2 points. Get pre-approved before stepping on the lot — gives you walk-away leverage.
Impact: A 2-point rate reduction on a typical $30K, 60-month loan saves ~$1,700 in total interest.
Put at least 20% down on a new car (10% on used)
High priorityAvoids immediate underwater status. If you can't afford 20% down, you can't afford that car — buy cheaper.
Impact: A $40K car with 20% down + 48-month loan has you positive equity within 18 months instead of 4+ years.
Decline most dealer add-ons
Medium priorityExtended warranties, paint protection, fabric protection, GAP insurance all have 50-70% markups. Buy GAP through your own insurer if you need it; skip the rest.
Impact: Typical dealer add-on package: $2,000-4,000. Most of that is profit.
What is a Car Loan?
A car loan is an amortising loan secured by a rapidly depreciating asset, and that combination creates a problem no other common loan has: the thing you borrowed against loses value faster than the loan balance falls. For the first years of a typical car loan, you owe more than the car is worth.
That gap — negative equity, colloquially being underwater — is the single most consequential fact about car financing, and it is why the structure of the deal matters more than the monthly payment. It determines what happens if the car is written off, if you need to sell, or if your circumstances change.
The other distinctive feature of car buying is that the financing is usually sold by the same party selling the car, with several separate profit centres in play at once. Understanding where those sit is what keeps the negotiation honest.
The formula — how to calculate a Car Loan
- P
- = amount financed — note that sales tax and fees are usually financed too, so the loan exceeds the sticker price
- r
- = monthly rate, APR ÷ 12
- n
- = number of monthly payments
- Rolled-over negative equity
- = any unpaid balance from a previous car loan added to this one — the fastest route to a permanently underwater position
The amount financed, not the negotiated price, is what interest is charged on. Trade-in value and down payment reduce it directly, which is why they matter more than most buyers assume.
Step-by-step example
- 01Negotiated price $32,000, sales tax at 6% = $1,920, plus $600 in fees. Total $34,520.
- 02Down payment $4,000 and no trade-in, so the amount financed P = $30,520.
- 03At 7.0% APR over 60 months: r = 0.005833, n = 60, (1.005833)⁶⁰ ≈ 1.4176.
- 04M = 30,520 × [0.005833 × 1.4176] ÷ [1.4176 − 1] ≈ $604 per month.
- 05Total paid: $604 × 60 = $36,240, so interest is about $5,720.
- 06Now the depreciation side. New vehicles commonly lose a substantial share of value in the first year and roughly half over five years.
- 07After year one, that $32,000 car might be worth around $25,000 while the loan balance is still near $25,300 — slightly underwater despite a $4,000 deposit.
- 08With no deposit, the same purchase would be underwater by several thousand for the first two to three years.
Negative equity: the problem specific to car loans
Depreciation is steepest immediately and slows over time; loan principal reduces slowly at first and accelerates. The two curves cross somewhere in the middle of a typical loan, and until they do you owe more than the car is worth.
This matters in three concrete situations. If the car is written off or stolen, insurance pays market value — not your loan balance — and you owe the difference in cash. If you need to sell, you must find the shortfall to clear the lien. And if you trade in while underwater, dealers will offer to roll the negative equity into the new loan, which starts the next car already behind.
Rolling over negative equity is how borrowers end up several cars deep in a debt that never resolves. Each roll adds principal to a new loan secured by a new depreciating asset, and the gap compounds.
Gap insurance exists because of this
Guaranteed Asset Protection covers the difference between the insurance payout and your loan balance if the car is totalled. It is genuinely useful when you are underwater — typically with a small deposit or a long term. It is also frequently sold at a large markup in the finance office; your own insurer or credit union will usually quote considerably less.
Where the dealer actually makes money
A car transaction has several independent profit centres, and treating it as one negotiation lets them be traded against each other in the dealer's favour.
The vehicle price is the visible one. The trade-in valuation is a second and is frequently used to offset an apparent discount on the first. Financing is a third: dealers arrange loans through lenders and may add a markup to the rate the lender approved, which is compensation for arranging the finance. Add-ons — extended warranties, paint protection, gap insurance, service plans — are the fourth and often the highest margin.
The defence is to separate them. Agree the out-the-door price of the car before mentioning a trade-in or financing. Arrive with a pre-approval from your bank or credit union so the dealer's finance offer has to beat a real number. Then evaluate each add-on individually on its own merits.
- Out-the-door price —
- the total including tax, title, registration and every fee. The only price worth negotiating, because it is the only one you actually pay.
- Dealer rate markup —
- the difference between the rate the lender approved and the rate you are offered. Negotiable, and invisible unless you have a competing pre-approval.
- Documentation fee —
- charged for paperwork. Capped by law in some states, effectively unlimited in others.
- Extended warranty —
- a service contract, not manufacturer coverage. High margin, negotiable, and purchasable later — you are not obliged to decide at signing.
- Money factor —
- the lease equivalent of an interest rate. Multiply by 2,400 to convert it to an approximate APR.
How term length compounds the depreciation problem
Long car loans have become common because they make expensive vehicles look affordable. A 72- or 84-month term reduces the payment substantially — and extends the period during which you are underwater, sometimes for most of the loan.
The interest cost is the visible part. The structural cost is that on an 84-month loan you are likely to still owe money at the point the vehicle needs significant repairs, and are almost certainly underwater if you need to change cars in the first four years.
$30,520 financed at 7.0%, by term
| Term | Monthly payment | Total interest | Time underwater (typical) |
|---|---|---|---|
| 36 months | ≈ $942 | ≈ $3,400 | Short, often under a year |
| 48 months | ≈ $731 | ≈ $4,570 | ≈ 1–1.5 years |
| 60 months | ≈ $604 | ≈ $5,720 | ≈ 2–3 years |
| 72 months | ≈ $520 | ≈ $6,920 | ≈ 3–4 years |
| 84 months | ≈ $461 | ≈ $8,190 | Most of the loan |
Time-underwater figures are indicative and depend on deposit size and the specific model's depreciation. Interest figures use the amortisation formula above.
New versus used, and where depreciation has already happened
The largest single cost of owning a new car is depreciation in the first two to three years, and it is a cost the first owner absorbs entirely. Buying a vehicle that is two or three years old transfers that loss to someone else while typically leaving most of the usable life intact.
The counterweights are real: used cars usually carry higher interest rates, shorter or no remaining manufacturer warranty, and unknown maintenance history. A certified pre-owned vehicle sits between the two, costing more than a private-sale used car in exchange for inspection and some warranty coverage.
The right comparison is total cost of ownership over your expected holding period — depreciation plus interest plus insurance plus maintenance — rather than purchase price or payment alone. Insurance in particular varies substantially by model and is worth quoting before you commit, not after.
Get pre-approved before you visit a dealer
A pre-approval from a bank or credit union does two things: it tells you the rate you actually qualify for, and it forces any dealer financing to compete against a real offer rather than against nothing. Dealers can and sometimes do beat it — which is fine, and is precisely the point of having it.
Key considerations
- Negotiate the out-the-door price, including tax and all fees, not the monthly payment.
- Arrive with a pre-approval so the dealer's finance offer must compete.
- Keep the term at or below 60 months where you can; 72 and 84 months extend the period underwater considerably.
- A deposit of around 20% on a new car substantially shortens the time you spend in negative equity.
- Get an insurance quote for the specific model before buying — premiums vary far more by vehicle than buyers expect.
- Consider gap insurance if you have a small deposit or a long term, but price it outside the dealership.
- Handle the trade-in as a separate transaction and check its value independently before discussing it.
Common mistakes to avoid
- Negotiating on the monthly payment, which lets the term be extended instead of the price reduced.
- Rolling negative equity from an old loan into a new one, compounding the problem across vehicles.
- Financing with a zero or minimal deposit, guaranteeing an extended period underwater.
- Taking 84-month financing to afford a more expensive car than the budget supports.
- Accepting dealer financing without a competing pre-approval, leaving any rate markup unchallenged.
- Buying add-ons in the finance office under time pressure — most can be purchased later and cheaper.
- Forgetting that sales tax and fees are financed too, so the loan exceeds the negotiated price.
Frequently asked questions
Sources & references
Written and fact-checked by the CalcProLabs Editorial Team against CFPB auto lending guidance. Read our calculation methodology and editorial policy.
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