To reduce physical contact, Covid-19 forced many tax authorities to embrace digital technologies for filing and payment. Pandemic control aside, e-filing and e-payment hold great promise in facilitating taxpayer compliance, increasing transparency and curbing opportunity for collusion (Okunogbe and Santoro 2021). Eswatini mandated e-filing for all income taxpayers in September 2020, through the online e-Tax platform. Subsequently, the tax administration launched a zero-cash-handling policy for tax payments in April 2021. Our paper evaluated the impact of the e-Tax mandate on income taxpayers’ filing and payment behaviour, examining the following questions: (i) What is the impact of mandating e-filing on filing and payment compliance? (ii) Are there any spillover effects on filing and payment accuracy? (iii) What are the key mechanisms that explain the results?