The structure of the company varies, but a financial manager is responsible for the same general things across the board. The manager is responsible for managing the budget. This involves allocating money to different projects and segments so that the business can continue operating, but the best projects get the necessary funding.
The manager is responsible for figuring out the financial projections for the business. The development of a new product, for example, requires an investment of capital over time. The finance manager is responsible for knowing how much the product is expected to cost and how much revenue it is expected to earn so that s/he can invest the appropriate amount in the product. This is a lot tougher than it sounds because there is no accurate financial data for the future. The finance manager will use data analyses and educated guesses to approximate the value, but it's extremely rare that s/he can be 100% sure of the future cash flows.
Figuring out the value of an operation is one thing, but it is another thing to figure out if it's worth financing. There is a cost to investing money, either the opportunity cost of not investing it elsewhere, the cost of borrowing money, or the cost of selling equity. The finance manager uses a number of tools, such as setting the cost of capital (the cost of money over time, which will be explored in further depth later on) to determine the cost of financing.
At the same time that this is going on, the financial manager must also ensure that the business has enough cash to pay upcoming financial obligations without hoarding assets that could otherwise be invested. This is a delicate dance between short-term and long-term responsibilities.
The CFO is the