Members of churches, trade unions and community groups are pledging to live on £1-a-day from 2-6 May to raise funds and in solidarity with the global poor.
TUC general secretary Brendan Barber used his visit to the University of the West of England to set out a full alternative to government cuts and austerity.
The TUC-sponsored 'March for the Alternative' to cuts and austerity is taking place in London on Saturday 26 March, from Victoria Embankment to a rally in Hyde Park.
The Institute for Fiscal Studies says that measures due to come into place in April 2011 will be equivalent to a loss of £200 per household on average.
Government policy is contributing to toughest livelihood squeeze in decades, says the Trades Union Congress ahead of the Chancellor's budget statement today.