Nadhim Zahawi’s failure to disclose that he was in discussions with HMRC over his taxes was a “serious failure to meet” ministerial standards, a damning report into the affair has found.

Sir Laurie Magnus, who carried out the investigation as the prime minister’s new ethics adviser, said the former chancellor “should have understood” from the outset that he was under investigation by HMRC and that it was a “serious matter”.

He also criticised the MP for Stratford-on-Avon for failing to correct the record for more than six months, after he dismissed reports that HMRC was “looking into” his tax affairs as “smears” during a July 2022 interview with Sky News’s Kay Burley.

Mr Zahawi was sacked as Tory party chairman on Sunday by Prime Minister Rishi Sunak following the publication of Sir Laurie’s report, which looked into whether the former minister had fallen foul of the ministerial code.

Here Sky News looks at the key points in Sir Laurie’s report:

‘Mr Zahawi should have understood this was a serious matter’

“Mr Zahawi has told me that he had formed the impression that he and his advisers were merely being asked certain queries by HMRC concerning his tax affairs, and that this impression persisted until he received a letter from HMRC on 15 July 2022.

“On the basis of the confidential information to which I have had access, including correspondence between HMRC and Mr Zahawi personally, I consider that an individual subject to the HMRC process faced by Mr Zahawi should have understood at the outset that they were under investigation by HMRC and that this was a serious matter.”

‘Investigation was a relevant matter for a minister to declare’

“I consider that an HMRC investigation of the nature faced by Mr Zahawi would be a relevant matter for a Minister to discuss and declare as part of their declaration of interests.

“I would expect a Minister to inform their Permanent Secretary and to seek their advice on any implications for the management of their responsibilities.

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“I would likewise expect a Minister proactively to update their declaration of interests form to include details of such an HMRC process.”

‘Mr Zahawi’s failure to declare investigation did not meet ministerial standards’

“After his appointment as Chancellor on 5 July 2022, Mr Zahawi completed a declaration of interests form which contained no reference to the HMRC investigation.

“A later form acknowledged (by way of an attachment) that Mr Zahawi was in discussion with HMRC to clarify a number of queries.

“Only following receipt of HMRC’s letter received on 15 July 2022, did Mr Zahawi update his declaration of interests form to acknowledge that his tax affairs were under investigation, but he provided no further details other than the statement made previously that he was clarifying queries.

“Given the nature of the investigation by HMRC, which started prior to his appointment as Secretary of State for Education on 15 September 2021, I consider that by failing to declare HMRC’s ongoing investigation before July 2022 – despite the ministerial declaration of interests form including specific prompts on tax affairs and HMRC investigations and disputes – Mr Zahawi failed to meet the requirement to declare any interests which might be thought to give rise to a conflict.”

‘Mr Zahawi failed to declare HMRC investigation ended in penalty’

“The subsequent fact that the investigation concluded with a penalty in relation to the tax affairs of a Minister also requires declaration and discussion.

“It is a relevant interest which could give rise to a conflict, and particularly so in the case of HM Treasury Ministers and the Chancellor of the Exchequer, who has responsibility for the UK tax system.

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“As a result of my inquiries, I conclude that Mr Zahawi failed to update his declaration of interest form appropriately after this settlement was agreed in principle in August 2022.

“It was not until mid-January 2023 that details of the earlier HMRC investigation and its outcome were declared.”

‘Omissions constitute a serious failure to meet ministerial standards’

“I also conclude that, in the appointments process for the governments formed in September 2022 and October 2022, Mr Zahawi failed to disclose relevant information – in this case the nature of the investigation and its outcome in a penalty – at the time of his appointment, including to Cabinet Office officials who support that process.

“Without knowledge of that information, the Cabinet Office was not in a position to inform the appointing Prime Minister.

“Taken together, I consider that these omissions constitute a serious failure to meet the standards set out in the Ministerial Code.”

Nadhim Zahawi’s interview with Sky News in July 2022

What Mr Zahawi said:

“There have been news stories over the last few days which are inaccurate, unfair and are clearly smears. It’s very sad that such smears should be circulated and sadder still that they have been published.

“These smears have falsely claimed that the Serious Fraud Office, the National Crime Agency, and HMRC are looking into me. Let me be absolutely clear. I am not aware of this. I have not been told that this is the case.

“I’ve always declared my financial interests and paid my taxes in the UK. If there are questions, of course, I will answer any questions HMRC has of me.”

What Sir Laurie said about the statement:

“Mr Zahawi has told me that at the time of this statement, he was under the impression that he was answering HMRC’s queries, but that he was not under investigation.

“I consider that an individual subject to the HMRC process faced by Mr Zahawi should have understood that they were under investigation by HMRC and that this was a serious matter.

“Under the Ministerial Code, Ministers have a duty to ‘be as open as possible with Parliament and the public’.

“Whilst this duty clearly does not extend to disclosing personal tax information, it does include a general duty to be accurate in statements to ensure a false impression is not given or maintained.

“Mr Zahawi did not correct the record until 21 January 2023, when Mr Zahawi’s public statement indicated that he had reached a settlement with HMRC following an investigation.

“I consider that this delay in correcting an untrue public statement is inconsistent with the requirement for openness.”

‘Insufficient regard for Ministerial Code’

“I consider that Mr Zahawi, in holding the high privilege of being a Minister of the Crown, has shown insufficient regard for the General Principles of the Ministerial Code and the requirements in particular, under the seven Principles of Public Life, to be honest, open and an exemplary leader through his own behaviour.

“I want to commend Mr Zahawi for his willingness to assist with my inquiry. I also fully appreciate the pressures faced by Ministers as they address the complex issues of government and the difficulties they encounter in balancing the demands of their personal lives and their ministerial responsibilities.

“These factors, however, cannot mitigate my overall judgement that Mr Zahawi’s conduct as a Minister has fallen below the high standards that, as Prime Minister, you rightly expect from those who serve in your government.”