Taxing the Rich (More), with Joel Slemrod (2023), Oxford Review of Economic Policy, Volume 39, Issue 3

What Drives Major Tax Reform? Implications for Taxing the Rich, with Martina Beretta and Katrine Jakobsen (2023), Oxford Review of Economic Policy, Volume 39, Issue 3. 

Tax Avoidance Networks and the Push for a 'Historic' Global Tax Reform, with Katarzyna Bilicka and Michael Devereux (2022), Tax Policy and the Economy, Volume 37

Investment Responses to Tax Policy under Uncertainty, with Maciej Albinowski (2021), Journal of Financial Economics, Volume 141, Issue 3, September 2021, Pages 1147-1170.

Discretionary Fiscal Responses to the Covid-19 Pandemic, with Michael Devereux, Martin Simmler and Eddy H.F. Tam (2020), Oxford Review of Economic Policy, graa019.

More Giving or More Givers? The Effects of Tax Incentives on Charitable Donations in the UK, with Miguel Almunia, Benjamin Lockwood and Kimberley Scharf (2020).  Journal of Public Economics, Vol. 183, March 2020, 104114.

Effectiveness of Fiscal Incentives for R&D: A Quasi-Experiment, with Li Liu (2019). American Economic Journal: Economic Policy, Vol. 11, No. 1, February, pp.266-91.   

Will the Real R&D Employees Please Stand up? Effects of Tax Breaks on Firm Level Outcomes (2018). International Tax and Public Finance, Vol. 25, No.1, February, pp.1-63.  

R&D and Productivity: Evidence from Large UK Establishments with Substantial R&D Activities, with Steve Bond (2017). Economics of Innovation and New Technology, Vol.26, Issue 1-2, pp.108-120. 

Working papers

Dividend Taxation and Firm Performance with Heterogeneous Payout Responses (conditionally accepted, American Economic Journal: Economic Policy)

with Katarzyna Bilicka and Evangelos Koumanakos

NBER WP version

We analyze the short and long-run performance of firms that were differentially affected by a new tax on dividends in the lead-up to the Global Financial Crisis. We use exogenous policy variation for firms with different legal statuses and financial year-end dates to causally identify the policy impact. Consistent with intertemporal tax arbitrage, immediately-affected firms significantly reduce payouts. At a time of severe liquidity shortage, the average firm uses the undistributed cash to pay back debt. In the long run, the allocation of undistributed cash to investment, retained earnings, and debt repayment predicts growth and the likelihood of bankruptcy.

Tax Policy, Investment and Profit-Shifting

with Katarzyna Bilicka and Michael Devereux

Multinational firms (MNEs) often pay no tax in high-tax countries because they shift a large fraction of their taxable income to tax havens. We build a model of tax policy and investment that incorporates unobserved heterogeneity in MNEs' profit-shifting capability and different costs of setting up a tax minimization network. The model matches the distribution of taxable profit and investment in detailed UK tax returns data. We use the model to quantify the policy tradeoff between raising tax revenue by combating tax avoidance (via, for example, a Global Minimum Tax) and attracting investment. The results solve a longstanding puzzle in the existing profit-shifting literature: our model reconciles the differences between previous micro- and macro-level estimates of profit-shifting elasticities by accounting for extensive margin decisions (to report positive or no taxable profit in a jurisdiction). We test the model's predictions using a reform in Italy that limited the profit-shifting activities of Italian MNEs as a quasi-natural experiment.

(This paper was previously titled 'Optimization Frictions and the Fixed Cost of Profit-Shifting')

Dynamics of Financing Frictions for Investment in R&D

with Ahmed Tohamy

Measurement and identification issues constitute a challenge in our understanding of the extent of financing constraints as a barrier to investment and innovation. Governments try to alleviate liquidity constraints of innovative firms by providing a range of support schemes, but there is limited evidence on their effectiveness. A special UK policy provides new insights and offers the possibility of carrying out counterfactual policy experiments in a setting with small and medium sized innovating firms that face financing constraints. Firms are offered incentives for R&D, giving loss-makers a choice between taking a cash injection from the government immediately or when they become profitable in the future. Claiming the cash immediately comes at a cost; the rate at which the government pays cash to loss-making firms is significantly lower than a future deduction. Different choices made by the firms are informative about heterogeneities in financing constraints and productivity across firms. The exogenous variation across firms and over time in deduction rates and the availability of the cash option identifies the effects of policy changes on cash flow, and consequently, outcomes of interest such as R&D investment and output. 

(formerly "Quantifying and Alleviating Financing Constraints: Structural Evidence from a Policy Experiment")

Business Location Decisions with a Global Minimum Tax (under review)

with Francois Bares, Michael Devereux and Vikram Patil

In an historic agreement in 2021, 141 countries agreed on imposing a global minimum tax (GMT) on the profits of multinational corporations. Proponents of the GMT argue that the measure will reduce the distortion to businesses' location decisions by reducing the dispersion in tax rates internationally. We investigate the impact of the GMT on business location and investment decisions. To do this, we develop a location choice model based on effective average tax rates (EATRs) augmented with incentives for profit-shifting to low-tax jurisdictions. GMT affects the dispersion of EATRs for new investment in different countries, but its impact is non-monotonic in the threshold rate. For low values of the GMT threshold, the introduction of a minimum tax increases EATRs more in high-tax countries relative to low tax countries, increasing the dispersion of EATRs. As the statutory minimum rate increases, more low-tax countries begin to set their tax rate at the threshold, reducing the dispersion. An increased threshold has heterogeneous cost of capital effects for different countries; we find that a high threshold rate may substantially depress capital accumulation in investment hubs. This analysis provides a novel contribution to the literature on the relationship between taxation and corporate decisions on real activity.

In progress

Investor Tax Breaks and Financing for Start-ups: Evidence from China, with Xipei Hou and Jing Xing

The Role of Intellectual Property in Tax Planning, with Katarzyna Bilicka and Paul Organ