"Our plans on tax have been set out in the manifesto: We are a party that believes in low taxes", May said Saturday at an election rally in Dewsbury, northern England, when asked if she plans to raise national insurance rates, a form of tax that is mainly used to pay for state benefits.
The lead of British Prime Minister Theresa May's Conservative Party over the opposition Labour Party has narrowed further to six percentage points ahead of Thursday's national election, according to an Opinium poll for the Observer newspaper.
'The only way they can be sure their taxes won't rise is to vote Conservative.
"Only two people can become prime minister next Friday morning and that's Theresa May and Jeremy Corbyn and that is the choice the country faces".
Under pressure after refusing to turn up for a TV debate earlier in the week, May rejected an accusation that she did a U-turn by calling a snap general election, the daily reported. "We already know your tax will go up if you vote Labour on Thursday", he said.
Other recent polls have also shown that May's lead, which stood at more than 20 points when she called the campaign, has been eaten away, meaning she might no longer win the landslide she had hoped for.
Defence Secretary Sir Michael Fallon said voting Conservative was "the only way" people could be sure income tax would not be hiked.
Police rush to London Bridge after reports of van hitting pedestrians
The incident came just a few days before the country's general election , which was scheduled to be held on Thursday, June 8. Five people, including a police officer, were killed and more than 50 others were injured in the terror attack on March 22.
She said: 'Our position on tax has not changed.
The latest confusion over income tax underscores the challenge facing the next government to meet the growing costs of public services at a time when Britain's budget deficit remains large, and with Brexit-related uncertainty likely to weigh on the economy.
The Conservative manifesto said there would be no increase in VAT but dropped David Cameron's pledge not to raise income tax or national insurance contributions after Chancellor Philip Hammond complained that it limited his room for manoeuvre.
The Conservative manifesto has ruled out an increase in Value-Added Tax, suggesting that the Chancellor Philip Hammond might well increase National Insurance contributions, as he had planned to in the Budget, but reversed after protests.
The Labour leader suggested he would sign off on more ships for the Navy and extra surveillance aircraft for the RAF alongside pledges to boost funding and numbers in the police and armed services. "The only guarantee the Tories are prepared to give at this election is to big business and high earners".
Labour's plans would see the 45p rate of income tax kick in for people earning £80,000 instead of the current £150,000, with a new 50p rate for people earning more than £123,000.