In assessing the level of coverage that may be appropriate, the following factors should be considered:
Umbrella coverage should generally cover the value of the taxable assets owned, as well as that of any homes beyond the primary residence. (Again, however, one's actual need could be higher or lower.) Assets held in employer-sponsored retirement accounts (e.g., 401(k) or 403(b) accounts) are generally protected from exposure to civil liability under the provisions of the Employee Retirement Income Security Act of 1974 (ERISA). The same protection generally also applies to up to $1 million worth of assets held in individual retirement accounts (IRAs). So, in assessing your needs for umbrella coverage, in general only nonqualified assets, along with assets in excess of $1 million in IRAs, need to be considered.
With respect to your primary residence, it's possible that at least part of this component of your net wealth need not be included when determining an appropriate level of umbrella coverage. This depends on the degree of protection under the homestead exemption2 for a given state of residence (intended to prevent the forced sale of a home to meet the demands of creditors).
For example, if you live in a state where the homestead exemption threshold is $1 million, and the value of your equity in the home is lower than $1 million, there is typically no need for umbrella liability protection on your home equity. Note, however, that for the homestead exemption to apply, a homeowner generally must record a Homestead Declaration with the local registry of deeds.