Liz Truss has announced she would immediately reverse the rise in National Insurance contributions if she were to replace Boris Johnson as Prime Minister.
The Foreign Secretary has repeatedly said she would scrap the tax brought in by former Chancellor and rival Rishi Sunak throughout the heated campaign.
It was initially believed the cut could only take place in April 2023, however her team say it can be reversed within weeks.
Truss and Sunak are under increasing pressure to help families across the country who are struggling to get by due to the current cost of living crisis.
On Friday, Business Secretary Kwasi Kwarteng said families would have to wait until a new Prime Minister was in place in order for help to be given.
Truss rejected the idea of giving "handouts" to Brits, however promised tax cuts instead.
Writing in the Sunday Telegraph, she said she would "immediately tackle the cost of living crisis by cutting taxes, reversing the rise on National Insurance and suspending the green levy on energy bills."
She added: "I would hit the ground running by bringing in an emergency budget, charting a firm course to get our economy growing in order to help fund our public services and NHS.
"I will look at what more can be done, but the way I would do things is in a Conservative way."
"We would put more money back in the pockets of hard-working people without delay. That is necessary, affordable and the right thing to do at a time when we face the highest tax burden in 70 years."
While, a Tory MP supporting Sunak said the former chancellor is "ready" to do more to help households amid the worsening cost-of-living crisis.
Former security minister Damian Hinds told Sky News: "These are indeed extraordinarily difficult times, I don't think anybody minimises that at all.
"The package that...Rishi Sunak put together that you mentioned, is targeted.
"It's a substantial package - £1200 for the most vulnerable households, a proportion of that is a broader, universal aspect.
"But things have been getting worse even since that was put into place in terms of projections for energy bills are going to be in future and he's been clear that more may well be needed and and he is ready to do that as required".
In a swipe at Mr Sunak's rival Liz Truss, Mr Hinds added: "It's completely wring to rule out that kind of direct support."
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