The Blouin, Core, Guay Marginal Tax Rate Database is now freely available for subscribers to Capital IQ Compustat North America data on Wharton Research Data Services (WRDS).

The Marginal Tax Rates database was created by Dr. Jennifer Blouin (The Wharton School), Dr. John Core (Massachusetts Institute of Technology), and Dr. Wayne Guay (The Wharton School) using Capital IQ Compustat data.

These rates correspond to the non-parametric marginal tax rates developed in the article: Have the Tax Benefits of Debt Been Overestimated?, Journal of Financial Economics 98(2); 195-213.

They developed improved estimates of marginal tax rates using a non-parametric procedure that produces more accurate estimates of the distribution of future taxable income.

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