An umbrella requires a qualifying policy underneath it. If that underlying policy is canceled or reduced mid-term, the umbrella is sitting above nothing and usually nobody notices.
If the underlying limit drops below the requirement, you are responsible for the difference as if you still carried it.
Three things about the policies underneath it.
Every umbrella states minimum liability limits required on the policies beneath it. If an underlying policy is canceled, non-renewed or quietly reduced, the umbrella does not step down to fill the space. Most forms treat you as if the required underlying limit were still in place, meaning the gap is yours.
Switching auto carriers to save money, or reducing a limit at renewal, can take you below the umbrella requirement without anybody connecting the two. It happens most often when the policies sit with different agents, because nobody is looking at the whole structure.
The practical defense is having the layers reviewed together. That is less about loyalty than about somebody noticing when a change to one policy undermines another.
Keeping the structure intact.
Stated in the policy and rarely read.
Compared against the requirement, not against memory.
A switch or a reduction is when the floor moves.
Send every liability policy you hold, including ones placed elsewhere.
We check the floor is still under the umbrella at every renewal.
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