sorry - but V&B policies are "claims made" policies. other providers (maybe yours) may be different...
from V&B:
I won’t be teaching again until after the first of the year, why must I renew my insurance?
By not renewing, you will have a gap or lapse in your insurance and will not have coverage for any "prior acts". This means if a student makes a claim against you for a wrongful act that occurred prior to your gap or lapse in coverage, then you would not be covered for this student's claim. This would be a "prior act".
In addition, the insurance you are purchasing is a "claims made" policy, requiring you to have insurance at the time of the claim. For example, you certified a student in 2004 and your insurance expired in June 2005. You obtain insurance again in January 2006, however, your student has an incident in October 2005 and files a claim against you. You will not have coverage for this claim because you did not have insurance at the time of the incident and since you had a "gap" in coverage, you will not be covered for any acts prior to January 2006.
It is important to maintain continuous coverage even if you won't be actively teaching for a while. We strongly recommend you purchase the non-teaching or retired protection.