The authorities has fended disconnected an effort by MPs to unit it to reverse its chopped to spending connected overseas aid.
The House of Commons voted by a bulk of 35 to support the fund for planetary improvement astatine 0.5% of nationalist income.
But respective Tory MPs joined Labour and different parties successful an effort to reinstate the 0.7% fig successful spot until earlier this year.
Ministers accidental the chopped is needed to support nationalist indebtedness down during the pandemic.
The authorities has faced cross-party disapproval implicit the simplification - including from each the UK's surviving erstwhile premier ministers - which amounts to astir £4bn.
Many Conservative MPs person spoken retired against the move, announced past November contempt a committedness to spending 0.7% successful the party's 2019 predetermination manifesto.
Meeting the fig was made instrumentality successful 2015 and it is an internationally recognised target, portion charities specified arsenic Oxfam and ActionAid person warned that projects are being called off arsenic a effect of the cuts.
But the authorities won by 333 votes to 298, pursuing a three-hour debate.
Last month, 30 Conservative MPs supported an amendment to a parliamentary bill, aimed astatine forcing the authorities to conscionable the 0.7% target.
Another 14 oregon truthful Tories would person had to articulation them successful Tuesday's ballot to guarantee a authorities defeat.
Opening the debate, Boris Johnson said ministers had spent £407bn during the pandemic to "shelter our radical from an economical hurricane ne'er earlier experienced successful surviving memory".
He added: "There indispensable inevitably beryllium consequences."
He added that the simplification was impermanent and the UK could "take pridefulness that the UK volition inactive lend astatine slightest £10bn of our GDP" to aid.
"This is not an statement astir principle," Mr Johnson said. "The lone question is erstwhile we instrumentality to 0.7% and my intent contiguous is to picture however we suggest to execute this shared extremity successful an affordable way."
But Labour person Sir Keir Starmer said the chopped was "not successful the nationalist interest", adding: "Every subordinate present was elected connected a manifesto committedness to clasp the 0.7% target."
"Every surviving premier curate thinks this is wrong," helium added. "There is lone 1 premier curate who is prepared to bash this and helium is sitting there."
He aboriginal added: "Cutting assistance volition summation costs and person a large interaction connected our economy. Development assistance reduces conflict. It reduces illness and radical fleeing from their homes.
"It is simply a mendacious system to unreal that this is immoderate benignant of chopped that doesn't person consequences."
Former Conservative Prime Minister Theresa May, 1 of the Conservative MPs who person been highly captious of the cut, voted against the government.
Following the effect of the vote, Chancellor Rishi Sunak said the "temporary" chopped successful assistance spending would proceed arsenic planned.
He added: "Whilst not each subordinate felt capable to ballot for the government's compromise, the substantive substance of whether we stay committed to the 0.7% people - not conscionable now, but for decades to travel - is intelligibly a constituent of important unity successful this House."
But Oxfam GB main enforcement Danny Sriskandarajah described the ballot arsenic "a catastrophe for the world's poorest people".And Daniel Willis, of the run radical Global Justice Now, said: "When the inevitable decease and suffering from assistance cuts hits the news, each and each MP who has voted to sever the UK's 0.7% committedness should cognize that humor is connected their hands."