Tapping taxes is a metaphor for exploring whether the next wave of digital disruption will have as dramatic an impact on the future management of revenue systems as it continues to have on business models. It is now being asked, will revenue administrations face dramatic disruption from digital competitors? This chapter explores a future operating model of digital integration, where revenue systems tap seamlessly into the digital footprints of people and businesses. While engagement with revenue systems has become increasingly digital and efficient over time, it has fundamentally remained separate, with data ingested and then exploited by revenue authorities. This chapter touches on some of the technological innovations and trends that coul...