The Big Switch: How Car Finance Works When You’re Changing Vehicles

Anthony McGrath • January 5, 2026

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It’s a familiar itch. You’ve had your current car for three years. It’s been great, but maybe your family has grown, your commute has changed, or you just really want that newer model with the better tech.


There’s just one problem: you’re only halfway through your five-year finance agreement.


Changing cars while you still have outstanding finance is incredibly common, but it requires a bit of math to ensure you don't end up in a worse financial position.

The Golden Rule: The Debt Doesn't Disappear


The most important thing to remember is that the loan is attached to you, secured by the car. Even if you don't want the car anymore, the lender still wants their money.


When you trade in a financed car for a new one, the goal is to sell the old car to the dealership and use that money to pay off the old loan.


How smoothly that goes depends entirely on one word: Equity.

Equity is the difference between what your current car is worth and the amount you still owe to the lender.



Step 1: The Settlement Figure


Before you visit a showroom, you need to call your current finance provider and ask for a "settlement figure" or "payoff amount."


This isn't just the sum of your remaining monthly payments. It is the exact amount required to clear the debt entirely today, minus any future interest you won't have to pay because you're ending the agreement early. Write this number down.



Step 2: The Valuation


Next, you need to know what your car is actually worth as a trade-in. Don't guess based on what you see on classified ads (those are retail prices). Get a realistic trade-in valuation from online tools or by visiting a couple of dealerships.



Step 3: Doing the Math (Positive vs. Negative Equity)


Now, compare the two numbers. This leads to one of two scenarios.


Scenario A: Positive Equity (The Good News)


Your car is worth more than the settlement figure.


  • Example: Your settlement figure is £10,000. The dealer offers you £13,000 for your trade-in.


  • The Result: You have £3,000 in positive equity. The dealer pays off the £10k loan, and you have £3,000 remaining to put down as a deposit on your new car, lowering your future monthly payments.


Scenario B: Negative Equity (Being "Upside Down")


Your car is worth less than the settlement figure. This is very common, especially in the first few years of a long loan term.


  • Example: Your settlement figure is £15,000. The dealer only offers you £11,000 for the trade-in.


  • The Result: You have £4,000 of "negative equity." You still owe that £4,000 even after handing over the car.


Dealing with Negative Equity


If you are upside down, you have two main choices to complete the switch:


  1. Pay the difference: You write a check for $4,000 to clear the old debt, and then start fresh on the new car finance. This is the smartest financial move.
  2. Roll it over: The dealership adds the $4,000 you still owe onto the price of your new car loan.
  • Warning: While convenient, this means you are paying interest on your new car and the remainder of your old car simultaneously. It increases your monthly payments and makes it much harder to get positive equity in the new vehicle later on.




Changing a financed car is seamless at the dealership, they handle all the paperwork and transfers with the lenders. However, knowing your equity position before you walk in prevents unpleasant surprises and helps you avoid rolling old debt into a new loan unless absolutely necessary.


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