Around 20 disability campaigners have unfurled banners and shouted slogans in the lobby of the House of Commons over the Government's cuts to benefits.
The protest took place as MPs were in the main Chamber for Prime Minister's Questions.
The demonstrators chanted "No more death from benefit cuts" and brandished a banner asking "Is this how 2 treat disabled people?"
Police officers lined up to prevent any attempt by the protesters to gain access to the Commons chamber but there was no immediate attempt to remove them.
Chancellor George Osborne's Budget has clearer is first parliamentary hurdle, despite a more than £4 billion hole left following his U-turn on disability benefit cuts.
Despite the highly charged debate over the Budget that has developed in recent days, the government won today's main vote on Budget resolutions by 310 votes to 275.
A series of specific budget resolutions, including the cut in capital gains tax, were also passed.
Mr Osborne admitted the now-scrapped disability payment cuts were a "mistake", but stressed that public finances had to be brought under control.
George Osborne has insisted that he will not cut the state pension as he looks to plug a £4 billion 'black hole' in his Budget.
During a debate with MPs, the Chancellor reiterated the Government currently has no plans to make further welfare savings to replace the continued PIP spending.
But he launched a defence of the benefits available to pensioners amid suggestions they need to be reduced to spread the impact of the cuts.
Labour's John McDonnell has said George Osborne is "unfit" for any leading office in government for his "grubby manipulations" in response to his disability benefit U-turn.
Speaking to MPs during the Budget debate, the Shadow Chancellor said the Tory budget process is in "absolute chaos" and urged the Government to rip up its fiscal plan and start again.
"PIPs are the benefits that for many disabled people actually make life worth living."
He added: "The Chancellor was willing to cut away this vital support to some of the poorest and most disadvantaged people of our community. Do not tell us we're all in this together."
The Chancellor has refused to apologise for attempting to introduce "upsetting" cuts to disability benefits before doing a U-turn on the plans.
George Osborne insisted he had listened to and learned from concerns about the cuts to the personal independence payment (PIP) and dropped the proposal.
But he did not accept former shadow chancellor Chris Leslie's invitation to say sorry for the mistake which left a £4.4 billion hole in the Budget.
Mr Osborne has taken the unusual step of opening the final day of debate in person so that he could respond to widespread concerns following ain Duncan Smith's dramatic resignation from the Cabinet.
George Osborne has defended his position as Chancellor as MPs prepare to vote to approve his Budget.
Mr Osborne told the Commons that if Britain wanted to build a "strong and compassionate society" the country had to live within its means.
"We have to back business to create jobs and we have to make sure work pays by putting more money into the pockets of working people."
The Chancellor also used his opening remarks to pay tribute to Ian Duncan Smith, who resigned as Work and Pensions Secretary last week over planned controversial cuts to the welfare budget.
George Osborne is due to defend his Budget in parliament today following the government u-turn on welfare cuts.Read the full story ›
There have been repeated calls for George Osborne's resignation after his budget was left in disarray.
But this is not the first time the chancellor's budgets have hit trouble.
ITV News political correspondent Libby Wiener reports.
Mayor London weighs in on Iain Duncan Smith's resignation and the abandoned disability payment cuts on ITV's The Agenda tonight.Read the full story ›
Prime Minister David Cameron has tried to calm unrest in his party over the resignation of Iain Duncan Smith, the former worker and pensions secretary.
ITV News political editor Robert Peston reports.