Tax policy and firms: Evidence from West Bengal

Our aim in this project is to investigate

  • How the Value-Added-Tax (VAT) affects firms’ compliance and production decisions in a large developing economy.
  • How the tax system affects the overall economic efficiency of production networks, in particular by distorting the quantity and quality of supplier-buyer matches.
  • The impact of a tax reform that lowered compliance costs for some firms in the network on both revenue and production efficiency.

This project is characterised by three key features

  • It is demand driven: it results from a collaboration between the West Bengal tax authorities, a research centre in Kolkata and the Institute for Fiscal Studies.
  • It will leverage data from several high-quality sources. We will use a novel administrative dataset which contains the VAT returns of more than 150,000 firms in West Bengal over 6 years, allowing us to map all supplier-buyer relationships amongst (tax-) registered firms. This will be analysed together with firm-level surveys that are available for India over our period of study and contain information on both registered and non-registered firms.
  • It will combine a detailed characterization of the production network in a developing economy, of interest to both the public finance and the trade/macro literature, with an evaluation of the impact of a key tax reform of direct interest to the policy stakeholders in West Bengal.

Methodologically we will combine:

  • A description of the firm production (input-output) network using recent tools in network analysis.
  • Estimation of the key behavioural and compliance elasticities entering formulas for optimal VAT design by leveraging the incentives created by a ‘dual’ VAT system and tax reforms. The particularities of the VAT system in place in West Bengal create a set of firms that are `VAT-informal’ but are nevertheless observed in the administrative data; this allows us to consider both intensive and extensive margins of tax compliance.
  • An evaluation of the impact of a recent policy reform based on difference-in-differences assumptions and exploiting data on firms from administrative and survey sources.

Overall, the results of this project will

  • Improve our understanding of how of the tax system affects firm’s production and compliance decisions and the shape and efficiency of production networks.
  • Provide new insights on the characteristics of these networks in a developing economy.
  • Inform the optimal form of VAT in economies characterized by large informal sectors and poor tax compliance.


  • Publication - Working Paper

    Taxation and supplier networks: Evidence from India

    20 Sep 2019 | Lucie Gadenne, Tushar Nandi, Roland Rathelot

  • Publication - Policy Brief

    Do taxes affect firm-to-firm trade? Evidence from India

    Intra-national trade costs are large in developing countries; gains from better integration of supply chains within these countries are potentially substantial. This study considers how the Value Added Tax (VAT) affects intra-national firm-to-firm trade in the state of West Bengal, India. Using rich data on the universe of the 180,000 firms paying taxes in the state...

    8 Jan 2020 | Lucie Gadenne, Tushar Nandi, Roland Rathelot