The Survey of Personal Incomes (SPI) is based on information held by HM Revenue and Customs tax offices on individuals who could be liable to UK income tax. It is carried out annually by HMRC
Released under formal Government Information Public Access (GIPA) Application to Department of Finance, Services and Innovation (DFSI) - FA#65 16-17.\r\n\r\nData Source: Office of State Revenue\r\n\r\
