Many items in the external accounts and in the tax return (especially for business income) require valuation judgments about the state of the business at the end of the reporting period. This may relate, for example, to the intention of a holding, the value of an asset or the probability of a future event. However, events or other new information may occur after the end of the reporting period that shed new light on the entity's situation at the end of the reporting period. Such events are in fact very common. Nevertheless, the legal situation is to a large extent unclear regarding the relevance of events after the end of the reporting period for external accounting and income taxation. The aim of this project is to use legal and business research methods to bring this issue to life and shed light on it.