ASC 230 allows either the direct method, which lists cash receipts and payments, or the indirect method, which starts from net income. The standard encourages the direct method, but nearly all public companies use the indirect method, and those that use the direct method must still provide a reconciliation from net income. Because the cash flow statement covers the whole consolidated group, companies with partially owned subsidiaries typically start from ProfitLoss, the XBRL element for net income including the portion attributable to noncontrolling interests. Companies with no noncontrolling interests often use NetIncomeLoss, the amount attributable to the parent, since the two are the same.
Some companies begin with income from continuing operations instead and present cash flows of discontinued operations separately. Others start from net income and later remove discontinued items. Always check which figure the reconciliation starts from before comparing it with the income statement.
Analysts use this line mainly as the anchor for judging earnings quality. The gap between net income and operating cash flow is explained by the lines below it, including depreciation, stock-based compensation, deferred taxes, and working capital changes. Operating cash flow that consistently runs ahead of net income usually indicates conservative accounting or heavy noncash charges; net income that repeatedly exceeds cash flow can point to aggressive revenue or expense timing.