There are broadly two types of reporting, for external and internal audiences. As with any piece of writing, when you are looking at creating financial reports you need to think about who your audience are and what they are going to do with your report.
The format of external reports, be it statutory reporting (to the Charity Commission or Companies House or other regulators) or reporting back to funders is often dictated by others, and is about presenting the organisation’s public face.
Internal reports are much more dynamic, providing information to support management, and you should choose formats that suit your users.