Labour has called for an investigation into preparations for new devolved taxes.
The party wants the Commons powerful Public Accounts Committee to investigate.
The call follows concerns earlier this week that work is not proceeding as it should.
A report by Audit Scotland suggested that work on implementing the Scottish rate of income tax was under-resourced.
The report found that the income tax project was "dependent on a single member of staff" in the Scottish Government.
Labour's Shadow Scottish Secretary, Margaret Curran MP, in a letter to the chair of the Public Accounts Committee, also a Labour MP, called for an investigation into how the work is progressing within HM Revenue and Customs.
The changes have been designed as representing "the biggest transfer of fiscal power to Scotland in 300 years."
The new tax is expected to be collected from next year.
Ms Curran wrote: "While the work of the Scottish Government was well scrutinised in Audit Scotland's report, the role of HMRC in relation to the Scottish Rate of Income Tax was not. This is, in part, because HMRC falls outside the remit of Audit Scotland. However, over the past year I have become concerned that preparations for the Scottish Rate of Income Tax in 2016 are not progressing smoothly, and the project may be under-resourced.
"Audit Scotland has shown that the Scottish Government is deeply underprepared for the new tax powers. I am hoping that your committee can now shed light on the preparations being made by the UK Government and HMRC. The people of Scotland have consistently expressed their desire for further powers for the Scottish Parliament. It is the responsibility of those in Government to ensure the powers that have been agreed are delivered as promised, on time and on budget."
Parliamentary Questions and Freedom of Information requests by Ms Curran have previously revealed that only eleven staff are dedicated to the project within HMRC.
They also showed that HMRC have recently upgraded the risks associated with delivering the Scottish Rate of Income Tax.
Scottish Finance Secretary John Swinney has insisted that the Scottish Government is "on track" to collect the tax.
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