California’s new three-day cancellation rule will give many used-car buyers and lessees more time to reconsider a vehicle transaction beginning October 1, 2026.
But the three-day period does not mean you can drive the car without limits and still expect to return it.
The new law includes a specific mileage restriction. If you drive too far after taking possession of the vehicle, you can lose the statutory right to cancel the transaction.
For qualifying used vehicles, the number to remember is 400 miles.
What Is the Mileage Limit Under California’s New 3-Day Rule?
Under California’s new CARS Act, the three-day cancellation right does not apply if the qualifying used vehicle has been driven more than 400 miles after the purchase or lease agreement is executed.
That makes 400 miles an important cutoff.
If you are considering canceling a qualifying transaction, you should not assume that staying within the three-day period is enough by itself.
Both time and mileage matter.
What Happens If You Drive More Than 400 Miles?
If the vehicle is driven more than 400 miles during the applicable period, the new statutory three-day cancellation right no longer applies.
For example, imagine that you buy a qualifying used car and decide on the second day that you want to cancel the purchase.
Being only two days into the transaction does not necessarily protect you if the vehicle has already been driven beyond the law’s mileage limit.
The three-day period and 400-mile restriction work together.
Is There Also a 250-Mile Limit?
This is where the new rule can become confusing.
There are actually two mileage numbers worth knowing:
- 250 miles can affect how much returning the vehicle costs.
- More than 400 miles can eliminate the statutory cancellation right.
Under the new law, a dealer may impose an additional mileage charge when the vehicle has been driven more than 250 miles.
That does not necessarily mean you lose your cancellation right as soon as the odometer passes 250 miles.
Instead, additional costs can begin to apply.
How Much Is the Mileage Charge After 250 Miles?
For mileage beyond 250 miles, the dealer may charge $1 per additional mile, subject to a maximum additional mileage charge of $150.
For example, if the applicable mileage calculation showed 300 miles of use, that would be 50 miles beyond the 250-mile threshold.
The potential additional mileage charge would therefore be $50.
But the important distinction remains:
250 miles relates to an additional charge.
More than 400 miles relates to whether the statutory cancellation right remains available.
Does the 400-Mile Limit Mean You Get 400 Free Miles?
No.
The new rule should not be treated as permission to drive a used car for three days and 400 miles at no cost.
Even before reaching the mileage cutoff, other requirements and potential charges can apply.
The dealer may be permitted to charge a restocking fee when the cancellation right is exercised, and the additional mileage charge can begin after the applicable 250-mile threshold.
The vehicle must also satisfy the law’s return conditions.
The purpose of the new cancellation right is to give qualifying consumers an opportunity to reconsider the transaction, not to provide a free short-term vehicle rental.
Does the Mileage Rule Apply to Used-Car Leases Too?
Yes, the new cancellation protection covers qualifying used-vehicle purchases and leases.
That means a consumer entering a qualifying used-car lease should also pay attention to the mileage restrictions during the three-day cancellation period.
The fact that you leased rather than purchased the vehicle does not mean you can ignore the mileage requirements.
What Cars Qualify for the 3-Day Cancellation Right?
The mileage rule matters only if the transaction qualifies for the new cancellation protection in the first place.
California’s new protection applies to qualifying used vehicles within the statutory price limit.
The law generally covers qualifying used vehicles priced at $50,000 or less, subject to additional requirements and exclusions.
So staying below 400 miles does not automatically create a cancellation right for a transaction that otherwise falls outside the law.
Does the 400-Mile Rule Apply to New Cars?
No, not as part of this three-day cancellation protection.
California’s new three-day cancellation right applies to qualifying used vehicles.
It does not create a general three-day cooling-off period for new cars.
A new-car buyer therefore should not assume that keeping the vehicle below 400 miles gives them a right to return it.
The mileage limit is a condition attached to the new qualifying used-vehicle cancellation protection.
When Does the 3-Day Period Begin?
The new cancellation period consists of three calendar days beginning on the calendar day after the purchase or lease agreement is executed.
The deadline can be affected if the dealership is closed to the public on what would otherwise be the final day.
This is another reason buyers should look at the actual cancellation disclosure provided by the dealer instead of relying on a general “three days” rule.
The exact deadline and mileage both matter.
What If You Are Already Close to 400 Miles?
If you think you may cancel the transaction, continuing to drive the vehicle can put the cancellation right at risk.
For example, someone who has already driven 380 miles should not assume they can continue using the vehicle normally simply because there is still another day left in the cancellation period.
Crossing the mileage threshold can affect the statutory right even if the time deadline has not yet arrived.
In that situation, minimizing additional driving and reviewing the cancellation instructions immediately would be important.
Should You Record the Odometer?
It is a sensible precaution.
The vehicle’s mileage can become an important fact if there is a disagreement about whether the statutory limit was exceeded.
Consumers considering cancellation can document the odometer when they receive the vehicle and again when returning it.
Photos showing the mileage and the vehicle’s condition can also provide a record of what the car looked like at the relevant time.
The paperwork from the dealership should also be kept.
Can a Dealer Refuse the Return Because of the Car’s Condition?
Mileage is not the only condition that matters.
The law contains requirements concerning the condition of a returned vehicle, so serious damage or other changes to the vehicle can create a separate issue even when the mileage remains below the limit.
At the same time, the law includes consumer protections intended to prevent dealers from improperly blocking a valid cancellation by making unsupported claims about the vehicle’s condition.
Consumers should therefore treat the vehicle carefully during the cancellation period and document its condition if they decide to return it.
Does Returning the Car Cost Money Even Below 250 Miles?
It can.
The potential mileage charge is separate from the restocking fee allowed under the new law.
A dealer may charge a restocking fee equal to 1.5% of the vehicle’s sale price, with a minimum of $200 and a maximum of $600, when the statutory conditions allow it.
So driving fewer than 250 miles does not necessarily mean canceling the transaction will cost nothing.
The mileage charge and restocking fee are separate issues.
What If the Dealer Offers a Better Return Policy?
A dealership can provide consumers with rights that are more generous than the minimum required by California law.
For example, a dealer could voluntarily offer a longer return period or different mileage allowance under its own written policy.
If that happens, the dealer’s contractual policy may provide additional options beyond the statutory three-day right.
Consumers should check the written terms carefully because a voluntary dealer return policy and California’s statutory cancellation right are not necessarily the same thing.
When Does the New Mileage Rule Take Effect?
The new three-day cancellation protection takes effect on October 1, 2026.
Until then, California’s existing used-car cancellation system remains in place.
Under the current system, qualifying buyers can purchase a two-day contract cancellation option for certain used vehicles.
Consumers buying around the transition date should therefore check which law applies to their transaction rather than assuming the new 400-mile rule is already in effect.
The Bottom Line
Starting October 1, 2026, California’s new CARS Act gives consumers a three-day cancellation right for qualifying used-vehicle purchases and leases, but there is an important mileage restriction.
The key numbers are:
- 250 miles: Additional mileage charges can begin to apply.
- $1 per mile: Potential charge for applicable mileage beyond 250 miles.
- $150: Maximum additional mileage charge.
- More than 400 miles: The statutory three-day cancellation right no longer applies.
So if you are considering returning a qualifying used car under California’s new rule, simply watching the calendar is not enough.
Watch the odometer too.