Third quarter level from US Government Accountability Office, Financial Report of the United States Government, Notes to the Financial Statements. Note 3, Accounts and Taxes Receivables, Gross taxes receivable. Series is converted to quarterly by linear interpolation. Unadjusted flow is calculated as the sum of the unadjusted flows of the differences between NIPA and MTS reports on income taxes (FOF series FU313078035), unemployment insurance (FOF series FU313078015) and excise taxes (FOF series FU313078025). Seasonally adjusted flow is obtained using X-12-ARIMA procedure.