All IMPLAN Value Added data are ultimately controlled to National Income and Product Accounts (NIPA) data published by the Bureau of Economic Analysis (BEA).
Employee Compensation and Proprietor Income
Please see this webpage for detailed information on the estimation of Employee Compensation and Proprietor Income: Estimating Non-Disclosures when Creating Employment and Labor Income Data.
Other Property Income (OPI) and Taxes on Production and Imports Net of Subsidy (TOPI)
Initial estimates of national TOPI by IMPLAN sector are generated by applying TOPI/Output ratios from the latest BEA Benchmark I-O table to current Output estimates. Initial estimates of national OPI by IMPLAN sector are generated by subtracting Intermediate Expenditures, Employee Compensation (EC), Proprietor Income, and TOPI from Output. These first estimates of national TOPI and OPI by IMPLAN sector are then controlled to the BEA's GDP-by-industry data, after projecting to the current data year.
To distribute the national data to the states, we turn to the BEA's GDP by State data. State-level OPI-to-EC and TOPI-to-Employment ratios are used with each county's EC and Employment estimates for each IMPLAN sector to calculate county-level first estimates of OPT and TOPI by IMPLAN sector. County-level OPI and TOPI estimates by IMPLAN sector are then forced to sum to the state level OPI and TOPI estimates.