What is a binder of insurance and when does my coverage actually start?

A binder is temporary proof of insurance issued by the carrier (or the producer on the carrier's behalf) that confirms coverage is in force, usually 30 to 60 days, while the actual policy documents are being prepared. The binder lists the named insured, the coverages, the limits, and the effective date — and it is legally equivalent to the eventual policy during the binder period. When your coverage actually starts depends on the effective date written on the binder, not the date you signed the application. So if you sign at 10am and the binder shows an effective date of noon tomorrow, you are not covered for that intervening 26 hours. Some carriers can backdate to the moment of signing; others cannot. This matters most when you are closing on a house (the policy needs to be effective by the closing time), buying a new car (you need a binder before driving off the lot), or switching carriers (the new policy effective date must be before the old policy cancellation date to avoid a lapse).