2016年-世界发展银行全球_Behavioral_Interventions_in_Tax_Compliance___Evidence_from_Guatemala_40页_1mb

Summary of "Behavioral Interventions in Tax Compliance: Evidence from Guatemala"

Core Content

This paper presents the results of a large-scale randomized controlled trial (RCT) in Guatemala aimed at improving tax compliance through behavioral interventions. The study focused on income tax for the 2013 tax year and tested the effectiveness of different types of tax reminder letters on both declaration and payment behavior.

Main Findings

• All letters increased declaration rates compared to the control group, but only two types increased payment rates and the average amount paid.
• The two most effective letters were:
  • A deterrent message framing non-declaration as an intentional and deliberate choice (to counter status quo bias).
  • A social norms message referencing the fact that 64.5% of taxpayers had already paid the tax, encouraging others to follow suit.
• These two interventions more than tripled tax receipts, with the deliberate choice letter increasing the average amount paid by $23.05, and the social norms letter by $13.97, compared to no letter.
• The social norms letter alone generated an estimated US$760,000 in additional tax revenue if sent to all taxpayers in the sample, with a 36-fold return on investment.
• The effects persisted at 12-month follow-up, suggesting that behavioral interventions can lead to long-term compliance improvements.

Key Interventions and Their Impact

Economic and Policy Implications

• The study estimates that the deliberate choice letter would have generated US$757,837 in additional tax revenue over 11 weeks, 35 times the cost of sending the letters.
• Reminders (nudges) were found to be effective in making the tax return more salient, thus prompting individuals to consider the trade-off of non-compliance.
• The results suggest that behavioral messages may be more beneficial in developing countries with low tax compliance, as they can generate additional revenues rather than just accelerating payment.
• The study also highlights the importance of framing in tax compliance messages, particularly the use of moral costs and social norms.

Methodology and Sample

• The trial involved 43,387 taxpayers who had failed to declare their income tax for the 2013 tax year.
• Taxpayers were randomly assigned to one of six treatment arms, including the control group and five different letter types.
• The sample was selected from 115,999 taxpayers who were due to declare under the "Profits from Lucrative Activities" regime.
• 1,565 taxpayers were excluded as they had already been contacted by the tax authority.

Theoretical Framework

• The paper introduces a theoretical model that combines deterrence and non-deterrence approaches to tax compliance.
• The model suggests that individuals make decisions based on expected monetary costs, moral costs, and moral benefits.
• The framework includes five mechanisms for improving compliance:
  1. Increasing the perceived probability of being caught.
  2. Increasing the perceived severity of punishment.
  3. Increasing the moral cost of non-compliance.
  4. Increasing the moral benefit of compliance.
  5. Providing reminders (nudges) on how, where, and when to pay.

Context and Relevance

• The Guatemalan tax system is characterized by low tax revenues (about 12% of GDP) and high tax evasion (estimated at 64% for individuals and firms).
• The study is significant as it is the first to test the same behavioral interventions on both individuals and firms in the context of tax compliance.
• It also provides evidence that even a relatively small social norm (64.5%) can have a substantial impact on tax behavior, especially in contexts where tax evasion is perceived as common.

Conclusion

• Behavioral interventions, particularly those that frame non-compliance as a deliberate choice or reference social norms, can significantly increase tax compliance in Guatemala.
• These interventions are cost-effective and lead to sustained improvements in tax behavior.
• The study supports the application of behavioral sciences in public policy and emphasizes the need for rigorous testing of communication strategies in tax administration.