Auto Loan Calculator With Trade In
Trading in your old car changes the new loan in two ways: the trade-in value cuts the amount you borrow, and anything you still owe on the old car adds to it. An auto loan calculator with trade in does both sums at once. The auto loan calculator above has fields for the trade-in value and the amount still owed, so the payment it shows is the real one. With the defaults — a $35,000 car, $3,500 down, no trade-in, 6.35% over 60 months — the loan is $31,500 and the payment is $614.12 a month.
Trade in a car worth $5,000 with $2,000 still owed on it, and the loan falls to $28,500, the payment falls to $555.64 and the total interest falls to $4,838.10. Trade in the same car while still owing $8,000 on it, and the loan rises to $34,500, the payment rises to $672.61 and the interest rises to $5,856.65. The difference between those two deals is $117 a month, and it comes entirely from what you owe on the old car. This page shows how the trade-in math works, when trading in beats selling privately, and how to avoid rolling negative equity into your next loan.
How a Trade-In Changes Your Loan
The loan amount is the vehicle price minus the down payment and the trade-in value, plus the amount still owed on the trade-in, plus sales tax and fees. The trade-in value is a credit: the dealer takes your old car and knocks its value off the price. The amount owed is a debt: the dealer pays off your old loan, and that payoff is added to the new loan. If the trade-in is worth more than you owe, you have positive equity and the loan shrinks. If you owe more than the car is worth, you have negative equity, and the shortfall is rolled into the new loan, so you pay interest on a car you no longer own.
Most states also give you a sales tax break on a trade-in: the tax is charged on the price after the trade-in credit, not on the full price. On a $35,000 car with a $5,000 trade-in and a 6% tax rate, the tax is $1,800 instead of $2,100, which saves $300. The calculator above applies the tax to the price after the trade-in credit, which matches how most states work, but a few states tax the full price, so check your state rule.
- Trade-in value. What the dealer will give you for your old car. It cuts the loan dollar for dollar.
- Amount still owed. What is left on your old loan. It adds to the new loan dollar for dollar.
- Equity. Trade-in value minus amount owed. Positive equity helps; negative equity hurts.
- Sales tax. In most states, tax is charged on the price after the trade-in credit.
Step 1 — Find Out What Your Car Is Worth
Get the trade-in value from two or three sources before you visit the dealer: an online valuation, a quote from a used-car buyer, and the dealer’s own offer. The dealer offer is usually the lowest of the three, because the dealer needs to resell the car at a profit. Knowing the other quotes gives you a number to negotiate against. A $1,000 better trade-in value cuts the loan by $1,000 and the payment by about $19.50 a month on a 60-month loan at 6.35%.
Step 2 — Find Out What You Still Owe
Check your loan payoff figure with your lender, not just the balance on your last statement. The payoff figure includes the interest up to the payoff date, and it is the number the dealer will use. If the payoff is $8,000 and the trade-in is worth $5,000, you have $3,000 of negative equity, and that $3,000 goes onto the new loan.
Step 3 — Enter Both Numbers in the Calculator
Put the trade-in value in the trade-in field and the amount owed in the “still owed” field, with the price, down payment, APR and term as usual. The calculator works out the loan, the payment, the interest and the payoff date. Try the deal with and without the trade-in to see exactly what it is worth to you.
Worked Examples: Trade-In Deals Compared
The table below uses a $35,000 car, $3,500 down, 6.35% APR and a 60-month term, and changes only the trade-in.
| Deal | Trade-in value | Still owed | Loan amount | Monthly payment | Total interest |
|---|---|---|---|---|---|
| No trade-in | $0 | $0 | $31,500 | $614.12 | $5,347.37 |
| Positive equity | $5,000 | $2,000 | $28,500 | $555.64 | $4,838.10 |
| Trade-in paid off | $10,000 | $0 | $21,500 | $419.16 | $3,649.80 |
| Negative equity | $5,000 | $8,000 | $34,500 | $672.61 | $5,856.65 |
The trade-in paid off in full is the best deal by far: a $419.16 payment against $614.12 with no trade-in, and $1,697.57 less interest. Negative equity is the worst: the payment is $58.49 a month higher than with no trade-in at all, and you are paying interest on $3,000 of a car you no longer own. If you have negative equity, the cheapest move is usually to keep the old car longer and pay the loan down until the equity turns positive.
How to Use the Trade-In Calculator
Five minutes with the calculator shows what the trade-in is really worth.
- Enter the new car price. The default is $35,000. Use the out-the-door price if you have it.
- Enter your down payment. The default is $3,500. Cash down and trade-in equity work the same way.
- Enter the trade-in value. Use the best quote you have, not the first offer the dealer makes.
- Enter the amount still owed. Use the payoff figure from your lender, not the statement balance.
- Set the APR and term, then compare. Run the deal with and without the trade-in, and with different trade-in values, to see the payment move.
What the Calculator Reports
Each figure shows a different part of the trade-in deal.
| Figure | What it is | Use it for |
|---|---|---|
| Monthly payment | Fixed amount due every month | Checking the deal fits your budget |
| Loan amount financed | Price minus down payment and trade-in, plus amount owed, tax and fees | Seeing what the trade-in did to the loan |
| Sales tax included | Tax on the price after the trade-in credit | Checking the tax saving |
| Total interest | All interest over the loan | Comparing trade-in deals |
| Total paid | Principal plus interest | The true cost of the car |
| Payoff date | When the loan ends | Planning when the car is yours |
Common Mistakes With Trade-Ins
Trade-ins are where dealers make their margin, so these mistakes are expensive.
- Negotiating the payment instead of the trade-in value. A low trade-in offer can be hidden behind a low monthly payment on a long term. Negotiate the price and the trade-in value separately.
- Not knowing what you owe. If you do not know the payoff figure, you cannot tell whether the dealer’s numbers are right.
- Rolling in big negative equity. Owing $3,000 more than the trade-in is worth adds $3,000 to the new loan, plus interest. It is usually cheaper to wait.
- Accepting the first trade-in offer. Get quotes from used-car buyers first. The dealer will usually match a better quote if you show it.
- Forgetting the tax saving. In most states the trade-in cuts the taxable price, which saves real money. On a $35,000 car with a $5,000 trade-in at 6% tax, the saving is $300.
Tips for the Best Trade-In Deal
A trade-in is convenient, but convenience has a price. These moves keep it low.
- Get three quotes before you go. An online valuation, a used-car buyer and the dealer. The highest quote is your floor.
- Clean the car. A clean car with service records gets a better offer than the same car dirty, because the dealer can sell it faster.
- Fix small things. A burnt-out bulb or a cracked mirror costs little to fix and can cost more in the trade-in offer.
- Consider selling privately. A private sale usually gets 10% to 15% more than a trade-in, but it takes time and you lose the sales tax saving.
- Run the numbers both ways. Use the calculator with the trade-in and with a private-sale price as extra down payment, and compare the payments.
Trade-In Quick Answers
The key trade-in numbers, all verified in the calculator above.
| Trade-in situation ($35,000 car, $3,500 down, 6.35%, 60 mo) | Loan | Payment | Interest |
|---|---|---|---|
| No trade-in | $31,500 | $614.12 | $5,347.37 |
| $5,000 value, $2,000 owed | $28,500 | $555.64 | $4,838.10 |
| $10,000 value, $0 owed | $21,500 | $419.16 | $3,649.80 |
| $5,000 value, $8,000 owed | $34,500 | $672.61 | $5,856.65 |
Related tools on this site: the main auto loan calculator, the sales tax calculator for the tax on your purchase, and the loan payment calculator for other loans. NerdWallet’s auto loan calculator is a useful second check on the same numbers.
Frequently Asked Questions
How does a trade-in affect my car loan?
The trade-in value cuts the loan and the amount owed on the old car adds to it. On a $35,000 car with $3,500 down, a $5,000 trade-in with $2,000 still owed gives a loan of $28,500 and a payment of $555.64 a month at 6.35% over 60 months, against $614.12 with no trade-in.
What is negative equity on a trade-in?
Negative equity means you owe more on your old car than it is worth. If the trade-in is worth $5,000 and you still owe $8,000, the $3,000 shortfall is added to the new loan. On the defaults, that raises the loan to $34,500, the payment to $672.61 and the total interest to $5,856.65.
Is it better to trade in or sell my car privately?
A private sale usually gets 10% to 15% more than a trade-in, but it takes time and you lose the sales tax saving, which is $300 on a $35,000 car with a $5,000 trade-in at 6% tax in most states. If you need the money fast or the car needs work, a trade-in is simpler. Run both options through the calculator above.
Does a trade-in lower my sales tax?
In most states, yes. The tax is charged on the price after the trade-in credit. On a $35,000 car with a $5,000 trade-in at 6% tax, the tax is $1,800 instead of $2,100, which saves $300. A few states tax the full price, so check your state rule.
Can I trade in a car I still owe money on?
Yes. The dealer pays off your old loan and adds any shortfall to the new loan. If the trade-in is worth more than you owe, the extra cuts the new loan. If you owe more than it is worth, the shortfall is added to the new loan, so check the payoff figure with your lender before you negotiate.
Disclaimer: This calculator is for general information only and is not financial advice. Rates and payments are estimates based on the numbers you enter; your lender’s actual offer depends on your credit score, the vehicle and current market rates. Check the terms with your lender before signing.