National Insurance
She said there "will be consequences" because of her decision to increase National Insurance for employers.
The Institute for Fiscal Studies believes the chancellor's £40bn tax bombshell will trickle down to employees.
Voters are also more likely to say it would not breach Labour's election manifesto.
Fiona Bruce had claimed the party did not mention "working people" in a section on National Insurance hikes.
The chancellor attacked the Tories in 2021 for planning to put up employers' National Insurance.
Keir Starmer has refused to deny that a major tax rate will go up in the Budget.
A cabinet minister appeared to confirm that Rachel Reeves will put up employers' National Insurance in the Budget.
The party will promise to cut another 2p off National Insurance.
The party's manifesto will pledge to knock another 2p off National Insurance.
The International Monetary Fund has warned the chancellor not to bring down National Insurance again before the election.