This paper investigates the economic impact of the apportionment formulae used to divide corporate income taxes among the states. Most apportionment formulae, by including payroll, turn the state corporate income tax at least partially into a payroll tax. Using panel data from 1978 - 1994, the results show that this distortion has an important effect on state-level employment. For the average state, reducing the payroll weight from one-third to one-quarter increases manufacturing employment around 3% and the result is highly robust. The results also indicate that apportionment changes have important negative externalities on other states in that the effects of the apportionment formula on aggregate employment is zero. Every job gained within a state from an apportionment change is taken from another state. This externality suggests that the U.S. would be better off if the apportionment formula were set at a federal level. The paper also shows that because the payroll component of the tax is administered on top of the existing payroll tax, the deadweight loss from this component of state corporate income taxation may be significant, despite the low tax rates.
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number
6614.
Length: Date of creation: Jun 1998 Date of revision: Publication status: published as Journal of Public Economics, Vol. 75, no. 1 (January 2000): 125-143. Handle: RePEc:nbr:nberwo:6614
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