A restaurant came to us still insured on a policy schedule that dated back several years. The schedule noted revenue of around $500,000, but the business had grown - current revenue was about $2.1 million.
That is a more than fourfold gap between what the policy assumed and what the business actually was. An insurer settles up to the sums insured you declare, so a stale sum insured can leave a business well short at claim time.