If you don’t yet have cash flow information for one year, you can use information from a shorter time period to estimate your totals. This is called annualization. To use this Excel template to annualize your cash flow, you can, for example, take your net cash flow for one month and multiply it by 12. However, this calculation assumes that your cash inflow and outflow will be the same for each of the twelve-month periods. Since these numbers can vary, annualized cash flow is only an approximation of your actual cash flow.