You can invest capital gains into a business that operates out of an Opportunity Zone but you can’t hold the funds indefinitely in a bank account. The funds need to be deployed into an operating business that meets the qualifications of being a "trade or business" as defined in the tax code. In addition, there are tests that need to be met in order for the business to qualify as a qualified Opportunity Zone business as defined in the regulations. These tests relate to the assets of the business in the Opportunity Zone and the amount of income generated from Opportunity Zone operations. Generally, 70% of the businesses assets need to be located in an Opportunity Zone and more than 50% of income for the business needs to be generated within an Opportunity Zone.