Tax records are invaluable for the study of economic inequality. Graphs published on the World Wealth and Income Database, for example, show just how ... this information can inform the public debate. The top 1% income share is now closely scrutinised by journalists and policymakers. But if the rich dodge taxes more than others, tax records will underestimate inequality. The key data source used in rich countries to study tax evasion is random tax audits - but these audits do not capture tax evasion by the very wealthy. In our recent study, however, we exploited a massive trove of data leaked from HSBC Switzerland, the so-called HSBC files, to fill this gap. We also made use of the Panama Papers, which last year revealed the identity of the shareholders of shell companies created by the Panamanian firm Mossack Fonseca. Just as with HSBC, this leak is valuable as it can be seen as a random event and involves a prominent provider of offshore financial services. We combined random audits with these new sources of information to shed light on who really evades taxes. The higher one moves up the wealth distribution, the higher the probability of hiding assets. So what are the consequences for inequality? At the very top of the pyramid, it is much greater than previously estimated. In Norway, where the available wealth data is particularly detailed, the super-wealthy appear to be 30% wealthier than previously though. The share of wealth owned by the top 0.1% increases from 8% to 10%.