Year-end level for trade receivables excluding those from the federal government is calculated as a portion of total trade receivables. Total trade receivables is calculated from the SOI, Corporation Income Tax Returns, Returns of Active Corporations, Table 6-Balance Sheet, Income Statement, Tax, and Other Selected Items, by Major Industry, excluding the industries of manufacturing, finance and insurance, management of companies, and unpublished detail on equity REITs, line Notes and accounts receivable less Allowance for bad debts; plus from the QFR, Table 1.1-Balance Sheet for Corporations in the NAICS Manufacturing Sector, All Total Asset Sizes, line Trade accounts and trade notes receivable (less allowance for doubtful accounts); less 2 percent to remove trade receivables of financial subsidiaries. Total trade receivables from the federal government (FOF series FL103070310) are then excluded. Levels for other quarters, including year-end quarters after the latest issue of the SOI, are calculated from the QFR, table 1.1, line Trade accounts and trade notes receivable (less allowance for doubtful accounts), multiplied by the ratio of the most recent SOI benchmark for Notes and accounts receivable less Allowance for bad debts to the QFR Trade accounts and trade notes receivable (less allowance for doubtful accounts), less the 2 percent adjustment to remove trade receivables of financial subsidiaries, and excluding total trade receivables from the federal government (FOF series FL103070310). Unadjusted flow is the change in the level; seasonally adjusted flow is obtained using X-12-ARIMA procedure.