Prime Minister David Cameron has dodged questions about whether he would benefit from the cut in the top rate of tax due to come in this April.
Under Government plans, the top rate is to be cut from 50% to 45% for those earning more than £150,000.
Labour MP Stephen Pound said he wanted to know whether the Prime Minister would benefit from the tax cut.
In a question to Mr Cameron, he said: "Can I ask you whether you will tell the House whether you personally will benefit from the millionaires' tax cut this April?"
Mr Cameron replied: "I will pay all the taxes that are due in the proper way. But the point I would make to you is that all the years you sat on this side of the House there was a top rate of tax which was lower than the one we are putting in place and I didn't hear anything from you then."
The Prime Minister's aides indicated in April last year that Mr Cameron was "relaxed" about the idea of his tax returns and those of other senior Cabinet ministers being published, and a Downing Street source said that this remains the case.
However, the source said that work on how such a publication would be handled had yet to be completed.
Tax tricks to improve your wealth
Cameron ducks personal tax question
If you wear a uniform of any kind to work and have to wash, repair or replace it yourself, you may be able to reclaim tax paid over the last four years. For some people, this could mean a windfall worth hundreds of pounds
The interest you receive on savings accounts (with the exception of cash Isas) is automatically taxed at a rate of 20%.
Higher-rate taxpayers therefore tend to owe money on the interest they are paid throughout the year. If, however, you are on a low income or not earning at all, you should be able to claim all or some of the tax deducted back
You can apply for a refund of vehicle tax if you are the current registered keeper or were the last registered keeper of your vehicle that no longer needs a tax disc
If you pay tax on a company, personal or State Pension through PAYE (the system employers use to deduct tax from your wages), you may well end up overpaying
There is a limit to the amount you need to pay in NI, whether or not you work for an employer.
Instances in which you may find that you have overpaid include if you work two or more jobs and earn more than £817 a week and if you move from self-employment to employment, but continue to pay Class 2 National Insurance contributions