Should Cash Flow Forecasting report based on Banks Statements or Accounting Data?

primary source for preparing forecasted cashflow is financial statement without financials data its impossible to forecast cashflow.

When preparing any Cash Forecast you need to consider your Cash in and out for the report period. you have to identify your needs from suppliers, bank obligations and payroll or any other payment (these represents cash-out items). moreover, you have to identify your collections, credit commission and dividends or any other receipts (these represents cash-in items).

While preparing the cash forecast you can rely on the historical data whether from accounting system or from bank statement. I believe it should be the same as the accounting system mostly reflects the bank account statement unless if there's any reconciling items.

Cash Forecast is an instrument for predicting future liquidity position for a company. so all included figures are anticipated based on previous agreements, future needs or historical data. 

Accounting Data, because all data of cash from operation , investing activities and financing activities are not available in bank statements.

Cash Forecast is based on Accounting Data because bank account is dependent on our business performance.

CORRECT ANSWER ACCOUNTING DATA