Nigel Farage has been dogged by questions about his finances since the Guardian revealed he received a £5m gift from a donor in 2024.Although he insists the gift did not have to be declared, several important questions remain unanswered.The sum was given shortly before Farage decided to stand in the 2024 general election – and it came from a Reform UK mega-donor, the Thai-based crypto billionaire Christopher Harborne.In recent days, Farage has attempted to deflect attention away from the gift, saying on several occasions that the money was to pay for his personal security, and that he would rather talk about it another time.“Yeah, yeah, well we’ll talk about that any other time that you’d like,” Farage said, when asked as he celebrated Reform’s capture of its first London council, in Havering last week.However, his political opponents have seized on the disclosure.Among them, Kevin Hollinrake, the Conservative party chair, has said Farage was “obliged” to declare the gift.The Reform leader may soon face questions from the Electoral Commission or the parliamentary standards watchdog, both of which have received reports related to the gift. On Wednesday, the parliamentary standards commissioner opened a formal inquiry into the gift.Here are some of the most important outstanding queries the UK’s potential future prime minister might wish to address.Is this the only gift he received in the run-up to the 2024 general election and beyond?On Sunday, the Guardian asked if Farage had received any other gifts in the past decade. Reform did not reply. On Monday, Reform UK’s legal team said in response to allegations of a different, earlier gift: “Mr Farage received no personal payment from Mr Harborne before the personal gift made in 2024.”