Guatemala tax authority boosts compliance with social-norm letters

Guatemala's tax authority, SAT, faced a familiar government problem: a large population of taxpayers who had simply not filed or paid a required tax, with the standard playbook being sterner language, audit threats, and legal consequence letters — the assumption being that non-payment is a rational bet against enforcement, so raising the credible threat of consequences should raise compliance.

Working with the World Bank and researchers testing behavioral alternatives, SAT instead tested letters that changed nothing about enforcement risk and simply reframed the message taxpayers received: alongside a deterrence-framed letter calling non-payment a deliberate choice, one version told recipients that 64.5% of taxpayers like them had already paid, betting that people respond more to what their peers are actually doing than to abstract threats of punishment.

In a randomized controlled trial covering 43,387 taxpayers who owed the 2013 income tax, SAT sent no letter, its existing standard letter, or one of several redesigned letters — plain-language versions naming the exact action required, one adding a deterrence frame (non-payment as a deliberate choice), and one adding the social-norm statement that most taxpayers had already paid. No group faced any different actual enforcement risk; only the letter's wording changed.