It will depend upon state laws that regulate insurance companies' underwriting rules. So if your insurance company has decided that they no longer want to carry your business for physical damage coverages to your vehicle they would have to notify you in the way that your state law prescribes for this situation.

For example in Wisconsin an insurance company may cancel a new policy any time within the first 60 days and are not required to provide you with a reason for the cancellation.

Here a cancellation is also permitted during the terms of the policy if the premium is not paid when it is due, discovery of fraud or material misrepresentation made by you or your representative in obtaining your insurance, or by your pursuit of a fraudulent claim under your policy, or significant changes in insuring characteristics. For the situations discussed above, no cancellation is effective until at least 10 days after the insurance company mails or delivers to you a written notice of cancellation.

In WI nonrenewal refers to the termination of a policy at the expiration date. If an insurance company decides it does not want to renew your policy, it must mail or deliver to you a nonrenewal notice at least 60 days before the policy's expiration date.

In Florida an insurance company must give a 10 day notice for nonpayment of premium and give 45 days of notice for a cancellation due to any other reason. To cancel a binder an insurance carrier must give a five (5) day written notice.

In some states there are specific laws regarding physical damage coverages of collision and comprehensive. For example in New York State you are required to get a photo pre-insurance inspection of your vehicle when you place physical damage coverage on your vehicle (with a few exceptions such as you have a new vehicle and your insurer waives the inspection if you have the proper documentation).

When getting physical damage coverage in NYS an insurer is required to immediately confirm physical damage coverage and remind the insured of the inspection requirement on a prescribed confirmation letter or an acknowledgment signed by the insured (applicant). The insurance company is also, at the time coverage is effected, furnish the insured with an inspection site where the inspection can be conducted during the 5 calendar day period.

If the mandatory inspection is not conducted prior to the expiration day of the 5 day deferral period in 11 NYCRR 67.4 then the physical damage coverages on the car shall be suspended at 12:01 am on the day following the 5th calendar day and the suspension shall continue until the inspection is effected. The insurer then must also inspect the auto and reinstate coverage for the automobile’s physical damage if the insured requests and inspection. Any such reinstatement shall be effective at the time of the inspection.

When physical damage coverage in NYS is suspended in this manner the insurer has between the 20th calendar day and 30th calendar day after the effective date of the suspension to mail the insured and any lien holders a confirmation of suspension of physical damage coverage.

To find out what your state's laws are regarding how long an insurance provider (underwriting) has to notify the insured when deciding to take comprehensive and collision off of the insured's vehicle, contact your state's insurance regulator.