In an NGO it is important to develop publicly accessible accounts, so no-one can question the way common funds are used.
In a business, ongoing management requires a clear picture of the financial health of the organization. The following documents show that health
This requires monthly and yearly
In addition at the end of each year a list of assets ( things like computer equipment, office furntiure, builidings, land etc)with their depreciation needs to be kept. This affects the balance sheet.
The balance sheet and Income and expense statement enable a system of checking the cash flows month by month.