Legal Definition of Mandatory: Compulsory; something one must do; not a matter to be acted upon only if one wishes to; obligatory | Learn the legal definition of mandatory and why it’s crucial for business owners. Discover examples of mandatory requirements, such as ensuring a safe working environment and tax compliance. Find out the importance of fulfilling mandatory obligations to protect your business, maintain credibility, and foster fair competition. Click to understand the significance of staying informed and diligently meeting mandatory obligations