On Bunching and Identi?cation of the Taxable Income Elasticity

Soren Blomquist, Anil Kumar and Che-Yuan Liang
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Soren Blomquist: Institute for Fiscal Studies

No CWP53/19, CeMMAP working papers from Centre for Microdata Methods and Practice, Institute for Fiscal Studies

Abstract: The taxable income elasticity is a key parameter for predicting the e?ect of tax reform or designing an income tax. Bunching at kinks and notches in a single budget set have been used to estimate the taxable income elasticity. We show that when the heterogeneity distribution is unrestricted the amount of bunching at a kink or a notch is not informative about the size of the taxable income elasticity, and neither is the entire distribution of taxable income for a convex budget set. Kinks do provide information about the size of the elasticity when a priori restrictions are placed on the heterogeneity distribution. They can identify the elasticity when the heterogeneity distribution is speci?ed across the kink and provide bounds under restrictions on the heterogeneity distribution. We also show that variation in budget sets can identify the taxable income elasticity when the distribution of preferences is unrestricted and stable across budget sets. For nonparametric utility with general heterogeneity we show that kinks only provide elasticity information about individuals at the kink and we give bounds analogous to those for isoelastic utility. Identi?cation becomes more di?cult with optimization errors We show in examples how results are a?ected by optimization errors.

Date: 2019-10-21
New Economics Papers: this item is included in nep-pbe and nep-upt
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Related works:
Journal Article: On Bunching and Identification of the Taxable Income Elasticity (2021)
Working Paper: On Bunching and Identification of the Taxable Income Elasticity (2017)
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