Megg Munn's husband is paid to be his wife's parliamentary assistant
Several ministers reportedly used allowances meant for the running of their offices to pay for personal tax advice - from a Labour MP's husband.
Meg Munn's husband Dennis Bates is said to have been paid £5,000 by Foreign Secretary David Miliband and others.
Ms Munn is also said to have claimed for tax advice from her husband.
They said advice relating to work as an MP was an allowable claim, but a business group said most taxpayers could not just reclaim the entire cost.
In its 19th day of reports on MPs' expenses claims - based on leaked receipts - the Daily Telegraph has focused on the use of office allowances.
Mr Miliband, Sheffield Hillsborough MP Angela Smith and ministers Gillian Merron, John Healey and Jim Knight are reported to have used Mr Bates's services.
They were reportedly charged £345 each in 2006-7 "for professional services in connection with your personal taxation affairs".
Mr Healey only claimed half the fee, which he said related to tax advice for his office costs, the newspaper said.
Ms Munn - a former foreign office minister who pays her husband to work as a Parliamentary assistant - is also said to have claimed on the taxpayer funded expenses for tax advice from her husband.
Neither Ms Munn nor Mr Bates have been available for comment but Mrs Merron, Mr Healey, Mr Knight and Ms Smith issued a statement.
It said: "Dennis Bates worked for 12 years for the Inland Revenue, specialising in the tax affairs of small businesses and is eminently qualified to provide advice."
"The Green Book which sets out the rules and advice on behalf of the Parliamentary authorities states specifically that professional advice, for example on tax and legal matters, is an allowable expense.
"Many MPs rightly seek professional assistance and advice where this relates specifically to their role as members of Parliament and the expense is therefore legitimate and justifiable. The purpose of this is to ensure all tax liabilities connected with parliamentary duties are properly dealt with."
Schools minister Mr Knight told the BBC he had used a different accountant until 2005 who had charged £763.75 for advice - compared with the £345 Mr Bates charged.
"Anyone listening who does as a - you know, for their small business or whatever - use an accountant, will know that you can't buy much for £345," he said.
"What it is, is just making sure that I'm paying the proper amount of tax so that I'm not falling foul of what one or two of my colleagues have done, where they've tried to avoid paying the full amount of tax that they should do."
But the Federation of Small Businesses said its members would be annoyed by the news as it appeared MPs were "treated differently" to other taxpayers.
If entrepreneurs sought professional tax advice, they had to pay the fee themselves and offset it against any profits, on which they paid tax, a spokesman said.
General taxpayers seeking advice on their self-assessment tax forms just had to pay the cost themselves, he added.
"What's happening with politicians, they have used tax advisers - and that's good as they say they want to get the tax right - but any fee they pay to accountants - they just get back on expenses.
"There's nothing illegal, it's in the Green Book [Commons rule book] , but then you get other taxpayers treated differently."