Tim Farron said his party was not prepared to walk into a political trap – but would look at the motion expected to be tabled this month.
Labour last month announced its support for a mansion tax in a bid to raise money to reinstate the 10p starter rate of income tax.
Mr Farron said on TV: "Normally speaking, we take Opposition Day motions as the mischief that they are ... but then again, sometimes you just have to look at things at face value."
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