AI, robotics and other forms of smart automation have the potential to bring great economic benefits, contributing up to $15 trillion to global GDP by 2030 according to PwC analysis. This extra wealth will also generate the demand for many jobs, but there are also concerns that it could displace many existing jobs. We have analysed in detail the tasks involved in over 200,000 existing jobs across 29 countries to assess what the potential for automation may be at various points over the next 20 years. During the first wave, we expect relatively low displacement of existing jobs, perhaps only around 3% by the early 2020s. But job displacement could increase in later waves as these technologies mature and are rolled out across the economy in increasingly autonomous form. By the mid-2030s, up to 30% of jobs could be automatable, with slightly more men being affected in the long run as autonomous vehicles and other machines replace many manual tasks where their share of employment is higher.