HMRC’S ONLINE TAX CALCULATOR has already fallen over, less than 24 hours after its launch.
The tool is designed to calculate how much income tax and national insurance an individual pays and to demonstrate how contributions are apportioned.
But from midday onwards, the calculator was displaying an error message saying it was unavailable.
A spokesman for HM Revenue & Customs said that approximately 400,000 people had used the site during the morning.
He told BBC News: “Our online calculator is extremely busy at this time but full service is being restored. The mobile app is unaffected.”
The service was launched as part of the government’s plans to make tax “more transparent” and forms part of the scheme to send taxpayers itemised statements of where their money is being spent. It does not include indirect taxes such as VAT in its calculations.
The mobile app is available from the Apple Store, Google Play and the HMRC website.
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