The Liberal Democrats are "all ears" to a Labour Party debate and planned Commons vote on proposals for a mansion tax.
Tim Farron, the Lib Dem president, insisted his party was not prepared to walk into a political trap set by the Opposition - but would look at the motion expected to be tabled later this month on a policy which has been a long-term part of the Lib Dem platform.
He added he believed the byelection result in Eastleigh on Thursday demonstrated the Liberal Democrats had the right to exercise more "muscle" in coalition negotiations.
Labour announced its support for a mansion tax last month in a bid to raise money to reinstate the 10p starter rate of income tax and challenged the Liberal Democrats to back the plan in a Commons vote.
And speaking on the BBC One Andrew Marr programme today, Mr Farron said: "Normally speaking, we take Opposition Day motions as the mischief that they are and we don't necessarily vote for them.
"(But) we're all ears. My view is not we should be lured into any Parliamentary trap by Labour but then again sometimes you just have to look at things at face value.
"So we will see."
The next Opposition Day in the Commons - when one of the opposition parties gets the opportunity to table a motion for debate by MPs - is expected to take place on Tuesday March 12.
Mr Farron also used the interview to criticise comments made yesterday by Defence Secretary Philip Hammond about the forthcoming spending review.
Mr Hammond said the Ministry of Defence should be protected from any further cuts and instead fresh savings should be made by cutting the welfare bill further.
But Mr Farron said such a move would be both unwise and immoral.
The Lib Dem president said: "It is not popular to offer tax cuts to the wealthy, as I think George Osborne is minded to do. It's popular to give tax cuts to people on middle incomes and on the lowest incomes.
"It's fair but it would also help the economy - poor people spend the money they have.
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"At a time like this to think it is more important to be investing in Trident (the nuclear deterrent) or something like that, rather than protecting people who are the least well off in our society, that would be morally wrong as well as just economically stupid."
