It sounds like you have a complex trust. Essentially, a complex trust is allowed to accumulate income.
Please see this link from the IRS for more details on the types of trusts available.
In TurboTax Business, you will need to make sure you have selected Complex trust under the section titled Other Return Info under the Other tab.
Then, you will be asked to confirm whether any income was distributed in the Distributions tab in the Federal taxes interview screens. Answer each item as applicable to your trust terms.