Intra vires

Ultra vires is a Latin phrase meaning "beyond the powers". If an act requires legal authority and it is done with such authority, it is characterised in law as intra vires ("within the powers"). If it is done without such authority, it is ultra vires. Acts that are intra vires may equivalently be termed "valid" and those that are ultra vires "invalid".

In corporate law, ultra vires describes acts attempted by a corporation that are beyond the scope of powers granted by the corporation's objects clause, articles of incorporation or in a clause in its Bylaws, in the laws authorizing a corporation's formation, or similar founding documents. Acts attempted by a corporation that are beyond the scope of its charter are void or voidable.

Several modern developments relating to corporate formation have limited the probability that ultra vires acts will occur. Except in the case of non-profit corporations (including municipal corporations), this legal doctrine is obsolescent; within recent years, almost all business corporations are chartered to allow them to transact any lawful business. The Model Business Corporation Act of the United States states that: "The validity of corporate action may not be challenged on the ground that the corporation lacks or lacked power to act." The doctrine still has some life among non-profit corporations or state-created corporate bodies established for a specific public purpose, such as universities or charities.

According to American laws, the concept of ultra vires can still arise in the following kinds of activities in some states:

In the United Kingdom, the Companies Act 2006 sections 31 and 39 greatly reduced the applicability of ultra vires in corporate law, although it can still apply in relation to charities and a shareholder may apply for an injunction, in advance only, to prevent an act which is claimed to be ultra vires.

...
Wikipedia