Ukip's manifesto offers "serious, fully-costed policies" for people who "believe in Britain", Nigel Farage said as he prepared to launch the party's detailed programme.
An in/out referendum on Britain's membership of the European Union "as soon as possible", a five-year ban on unskilled migrants coming in to the UK and a points-based system for others are among its key pledges.
But with the party keen to broaden its appeal and build on a surge which saw it win last year's European elections, it offers boosts for first-time buyers, military veterans, small businesses and hospital patients.
Under Ukip plans, the NHS would receive an extra £12 billion across the five years of the next Parliament with another £5.2 billion being added to social care budgets.
And - in contrast to the Conservatives - defence spending would be kept at or above the Nato target of 2% of GDP, paid for in part by slashing the foreign aid budget by £9 billion a year.
Tories said that cash - as well as proposed savings from leaving the EU, reducing funding to Scotland and scrapping the HS2 high-speed rail project - had been spent several times over, leaving a £37 billion "black hole".
But Mr Farage - who famously dismissed his party's 2010 manifesto as "486 pages of drivel" - said the new document showed there was "real change on the horizon" in British politics for the first time in a century.
Despite a decline over recent weeks, Ukip remains comfortably the third most popular party in opinion polls and is looking to hold a pivotal role in any coalition negotiations by increasing its current tally of two MPs.
"In our manifesto, launched today, you will find serious, fully-costed policies that reflect what Ukip is all about: believing in our country," said Mr Farage - who has said bringing forward the Tories' proposed 2017 EU referendum would be a key demand in any post-election deal.
"On the major issues of the day - immigration, the economy, our health service and living standards - the establishment parties have repeatedly and knowingly raised the expectations of the public, only to let us down, time and time again."
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