Cash value increases within the policy are not subject to income taxes unless certain events occur. For this reason, insurance policies can be a legal and legitimate tax shelter wherein savings can increase without taxation until the owner withdraws the money from the policy. In flexible-premium policies, large deposits of premium could cause the contract to be considered a "modified endowment contract" by the Internal Revenue Service (IRS), which negates many of the tax advantages associated with life insurance. The insurance company, in most cases, will inform the policy owner of this danger before deciding their premium.