Jeremy Corbyn has admitted those on lower incomes could pay more tax under a future Labour government.
The Labour leader had previously insisted only the richest 5% of taxpayers, those earning about £80,000 a year or more, would face tax rises.
But he was forced to concede a plan to scrap a tax break for married couples would impact those earning less.
Mr Corbyn argued in a BBC interview that those affected would benefit from a higher living wage.
“They will also be getting improvement in free nursery provision for two to four-year-olds,” he added.
Challenged on the policy in an interview with Andrew Neil on Tuesday night, Mr Corbyn