Background to the report

The Wales Act 2014 amended the Government of Wales Act 2006 to give the National Assembly for Wales (the Assembly) the power to set Welsh rates of income tax that will apply to the non-savings non-dividend income of Welsh taxpayers from the 2019-20 tax year onwards. From April 2019, the United Kingdom (UK) basic, higher and additional income tax rates will be reduced by 10 percentage points and the Assembly will use its powers to determine the Welsh rates that will replace them. For 2019‑20, the Welsh Government has proposed rates equal to the reduction in the UK rates: 10 percentage points.

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HM Revenue & Customs (HMRC) is currently implementing the Welsh rates of income tax. This involves making changes to a range of IT systems that support tax assessment and collection, taxpayer communications and financial reporting functionality. It also needs to develop a Welsh taxpayer population from existing taxpayer records to ensure that the right amount of tax is collected from individuals and allocated to the appropriate government. Once implemented, HMRC will administer and collect income tax from Welsh taxpayers as part of the UK tax system.

Content and scope of the report

This report covers the activities of HMRC before the introduction of the Welsh rates of income tax in April 2019. It provides:

  • an overview of HMRC’s approach to the administration of devolved taxes in the context of the UK tax system (Part One);
  • our findings from reviewing the Welsh rates of income tax implementation project, including key events and timings (Part Two); and
  • details of the cost of administering Welsh income tax, including whether the amounts are accurate and fair (Part Three).


Publication details

Press release

View press release (24 Jan 2019)

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