Annual unadjusted flow from BEA, NIPA. Series is calculated as Table 1.10, line 12, Net operating surplus, Private enterprises; less Table 1.14, line 24, nonfinancial corporate business net operating surplus; less households and nonprofit organizations net operating surplus (FOF series FU156402101); less noncorporate business net national income (FOF series FU116140001); plus noncorporate business property income interest received (FOF series FU116130101); less noncorporate business interest paid (FOF series FU116130001); less noncorporate business withdrawals from income of quasi-corporations (FOF series FU116122001); less noncorporate business reinvested earnings on foreign direct investment (FOF series FU113192281); less noncorporate business rents (FOF series FU116112001). Quarterly unadjusted flow from unpublished detail provided by BEA. Data for the most recent ten years show no significant seasonality. Series has no levels.