Conservative MPs have called for HMRC to investigate whether Rachel Reeves paid proper taxes on expenses claimed during her time at Halifax Bank of Scotland.
Shadow Cabinet Office Minister Mike Wood penned a letter to HMRC chief Sir Jim Harra questioning whether the Chancellor paid relevant tax on benefits received between 2007 and 2009.
Wood cited the Income Tax Act 2003, arguing that expenses should be "wholly, exclusively and necessarily in the performance of the duties of the employment".
The concerns centre on Reeves's use of a company "motivation card" designed for staff gifts and entertainment.
Chancellor Rachel Reeves
PA
Receipts showed the Chancellor spent hundreds of pounds on handbags, perfume, earrings and wine for colleagues, including presents for her boss.
A whistleblower alleged that Reeves was one of three managers who used bank funds to "fund a lifestyle" through allegedly inappropriate spending.
The expenses included expenditure on dinners, events, taxis and gifts between managers.
A report compiled by the whistleblower in early 2009 flagged concerns about excessive spending, including Christmas and birthday presents.
The whistleblower also raised issues about Reeves's taxi expenses and spending on a Christmas party.
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Christmas shoppers walk past a Whittard of Chelsea's and a branch of Halifax York city centre
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An initial independent investigation found that the three managers appeared to have breached company rules.
In his letter to HMRC, Wood stated: "It is clear that through a combination of expense claims and use of a company motivation card, Reeves received at least hundreds of pounds worth of benefits in kind."
Wood emphasised there was "strong public interest" for HMRC to investigate potential underpaid tax, given Reeves' current role as Chancellor of the Exchequer.
His letter highlighted ministerial standards requirements for ministers to ensure their tax affairs are in good order.
A spokesman for Reeves previously stated she had no knowledge of the investigation, always complied with expenses rules and left the bank on good terms.
Rachel Reeves
PACritics have raised particular concerns about the timing of the expenses claims, which occurred when HBOS had received a £20.5billion taxpayer bailout.
A Labour backbencher told The Telegraph: "HBOS had to be bailed out by the taxpayer, and at the time there were people on very low incomes paying tax to support it."
"To hear that there are question marks about her expenses at this time raises questions that need to be answered. Its time she comes clean," the MP added.
"Was she taking money off the poorest in society and living a high life on expenses?"
A spokesperson for Reeves previously said she had no knowledge of the investigation and always complied with expenses rules during her employment at HBOS.
The spokesperson added that Reeves left the bank on good terms.
GB News has approached the Treasury for comment.
