Labour deputy leader Angela Rayner says she has done "nothing wrong" after Bury North MP James Daly alerted police over the sale of her council house.
The Failsworth and Ashton MP has faced questions over whether she paid the right amount of tax on the 2015 sale of her council house due to confusion over whether it was her main home.
Mr Daly, a deputy chairman of the Conservatives, made Greater Manchester Police (GMP) aware of neighbours contradicting Ms Rayner’s statement that her property, separate from her husband’s, was her principal residency.
He alleged she may have made a false declaration about where she was living on the electoral register.
Ms Rayner said he would not publish the tax advice she received on the sale of her council house, as Labour leader Sir Keir Starmer backed his deputy’s decision and expressed his “full confidence” in her amid fresh scrutiny over her living situation a decade ago.
She said she will only release the information if the Conservatives also publish theirs.
On Thursday, she insisted she had “done absolutely nothing wrong” and took legal advice that no rules were broken.
Asked why she would not publish that advice, Ms Rayner told BBC Radio 4’s Today programme: “Because that’s my personal tax advice. But I’m happy to comply with the necessary authorities that want to see that.”
She said she would hand over the information to the police and HMRC but added "I’m not going to put out all of my personal details for the last 15 years about my family”.
Sir Keir publicly backed his deputy, telling his party’s local election campaign launch in the West Midlands: “Angela has my full support and my full confidence today and every day.”
He also said: “She has not broken any rules, she has in fact taken legal and tax advice which has satisfied her, and us, and me about the position.”
Ms Rayner has also rejected suggestions in a book by former Tory deputy chairman Lord Ashcroft that she failed to properly declare her main home.
The unauthorised biography alleges that she bought her former council house, in Vicarage Road in Stockport, with a 25 per cent discount in 2007 under the right-to-buy scheme.
The former carer is said to have made a £48,500 profit when selling the house eight years later.
Government guidance says that a tenant can apply to buy their council home through the right-to-buy scheme if it is their only or main home.
Her husband was listed at another address in Lowndes Lane, about a mile away, which had also been bought under the right-to-buy scheme.
In the same year as her wedding, Ms Rayner is said to have re-registered the births of her two youngest children, giving her address as where her husband resided.
Ms Rayner has insisted that Vicarage Road was her principal property despite her husband living elsewhere at the time.
But neighbours have reportedly disputed her claim that she lived apart from her husband.
Tax experts have estimated that, while Ms Rayner may not have owed anything in capital gains tax following the sale depending on her residency situation, there are circumstances in which she could have owed as much as £3,500 to the taxman.
On Wednesday, a GMP spokesperson said: “We have received a complaint regarding our decision not to investigate an allegation and are in the process of reassessing this decision.
“The complainant will be updated with the outcome of the reassessment in due course.”
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