Harriet Harman has confirmed that a detailed breakdown of the spending of 14 MPs under the additional costs allowances will be published on Friday.
The leader of the Commons told MPs on Thursday that the information would be made public following a High Court ruling last week.
Commons authorities had challenged a decision by the Information Tribunal, which ruled that the expenses of the 14 high profile MPs should be made public under freedom of information laws.
Harman said that information about MPs' home addresses would also be made public, as instructed by the High Court.
However she said this would be "subject to individual consideration of security issues", suggesting some information may be withheld.
"We want to have probity in the way that public money is spent, but we must have democracy and the rights of people being able to speak up in this chamber freely," she said.
She added: "As far as publishing the addresses of all members is concerned... I am determined - as we all are - that MPs should be able to speak in this House on controversial issues without looking over their shoulder because their home address is in the public domain.
"We are considering further how we can be sure that the money for members' London homes is properly spent, that we give out information about expenses that the public is entitled to, but we must also ensure that the protection needed for members to speak out in this House remains."
Harman confirmed that information on the additional costs allowances of all other MPs would be published on a single date later in the year.
Shadow leader of the Commons Theresa May said: "It is necessary that we ensure that our systems make sure that money is properly spent.
"That there is transparency but also that honourable members are not prevented from speaking out in this House as they wish to be able to do."
Allowances
Meanwhile, Labour MP David Winnick called for more information to be made available about why MPs needed additional allowances.
"Can I fully endorse what my right honourable friend [Harman] said about security consideration regarding members of Parliament," he said.
"We should be in a position and must be in a position to speak our mind in this House without any threats of any kind.
"But otherwise would she take the view as I do that the High Court decision on our allowances was right, it was justified and whatever money we claim should be known to the public.
"Would it not be useful if more was done to explain why we claim this money, why it's essential in order to carry out our duties, and that really there's no need for apology."
Harman said the second homes allowance was needed to enable MPs to be both in Westminster and in their constituency.
She said that they "also need properly staffed offices to deal with the many requests for help and support that we receive from our constituents and also to engage with them on public policy".
"We need to justify the allowances that are available in the public interest, we must ensure that there's public confidence in that and therefore we have to do as he's suggested and make the explanation more clear," she said.
