Marcel Olbert

Taxation is a central economic policy tool, with governments increasingly using tax policy to stimulate local economic growth and also regulate multinational firms. We review the empirical literature that studies the effect of tax policies on firms' investment, employment, and other real outcomes. Building on the neoclassical theory of corporate taxes and tangible investment, we propose an organizing framework for our review that captures the wide set of tax policies and firm responses examined in accounting research. This framework highlights four dimensions along which accounting scholars contribute to the literature: (i) documenting the role of financial reporting incentives as a moderating factor in firms' real responses, (ii) studying firms' reporting versus real responses, (iii) quantifying real effects of tax disclosure regulations, and (iv) improving measurement of firms' tax status and proxies for investment and employment. We identify open questions for future research and suggest new international, federal, and local settings that may help uncover underlying mechanisms driving observed economic phenomena. Specifically, we encourage scholars to further distinguish firms' reported and real responses to tax changes and improve measurement of these outcomes, especially in settings related to environmental taxation or settings in which tax avoidance and real outcomes are closely linked.

This paper offers the first systematic evidence on environmental, social, and governance (ESG) disclosures provided by a large global sample of private equity (PE) firms. Using historical websites from 2000 to 2022, we develop and validate a novel dictionary-based measure of voluntary PE firm ESG disclosures. Descriptive statistics reveal an increasing time trend in these disclosures, with social topics becoming as important as environmental topics recently. Multivariate analyses show that the demand for ESG information from fund investors is a significant determinant of PE firms' ESG disclosures. Leveraging data on PE firms' portfolio companies, we document that more PE firm ESG disclosures are associated with better ESG outcomes at the portfolio company level, suggesting that voluntary ESG disclosures align with real actions for the average PE firm.

Over 140 countries agreed on a fundamental corporate tax reform in 2021 to be implemented in 2023 and beyond. To measure its potential effects, we study asset price changes within minutes of the reform announcements. We construct proxies for the reform's costs regarding U.S. companies' tax burdens and countries' public finances. Likely exposed companies exhibit significant negative stock returns. Our lower-bound estimates indicate total shareholder value losses of $112.6 billion one day after the reform announcements. Further, likely exposed countries experience increases in sovereign debt credit risk. Our findings inform the cost-benefit analysis of a historical international tax reform.

We investigate the effects of mandatory private Country-by-Country Reporting (CbCR) to European tax authorities on multinational firms' capital and labor investments, as well as their organizational structures. We exploit the threshold-based application of this 2016 disclosure rule to conduct difference-in-differences and regression discontinuity tests. We document increases in capital and labor expenditures in Europe, but these effects are more pronounced in countries with preferential tax regimes. Cross-sectional tests and analysis using consolidated financial data provide evidence consistent with multinational firms reallocating capital across Europe to mitigate increased tax enforcement risk, as well as with CbCR hindering capital investment efficiency. We also find evidence consistent with firms responding to CbCR by reducing organizational complexity. Collectively, our results support the conclusion that mandatory private CbCR causes firms to change real investment activities to substantiate their tax avoidance activities in Europe while reducing the appearance of aggressive tax practices.