Migrants are to be questioned about their English language skills and what efforts they have made to find work before being able to claim income-related benefits.
The Government said a "more robust" test is being rolled out at jobcentres across Wales, England and Scotland this week.
In order to pass a habitual residence test, migrants will have to answer more individually tailored questions, provide more detailed answers, and submit more evidence before they will be allowed to make a claim.
For the first time migrants will be quizzed about what efforts they have made to find work before coming to the UK and whether their English language skills will be a barrier to them finding employment.
Secretary of State for Work and Pensions Iain Duncan Smith said: "It is vitally important that we have strict rules in place to protect the integrity of our benefits system.
"The British public are rightly concerned that migrants should contribute to this country and not be drawn here by the attractiveness of our benefits system. And we are taking action to ensure that that is the case.
"The roll-out of the new habitual residence test is the first in a series of measures to ensure that we have a fair system: one which provides support for genuine workers and jobseekers, but does not allow people to come to our country and take advantage. It is a crucial part of our long-term plan to secure Britain's economy."
Five biggest taxpayer stings
Migrant benefit claimants face quiz
Most recently HM Revenue & Customs let Vodafone off the hook - for quite a sum. Vodafone paid out just £1.25 billion despite an original tax bill being closer to £8 billion (HMRC has always refused to reveal how much it thought the Vodafone final bill was). The episode was made even more shaming and painful because Vodafone was given several years to come good with the cash owed - even though it was sitting on a substantial cash pile at the time.
The Exchequer is estimated to have lost around £10 million to Goldman Sachs recently through an 'error' made by HMRC. The episode relates to an employee benefit trust run by Goldman allowing employees to take non-repayable loans that had no National Insurance contributions tied to them. HMRC did claw back the full amount from more than 20 businesses - but not Goldman. HMRC remains cagey about the details of the deal. Little HMRC accountability or transparency.
Huge problems with QinetiQ, the former Defence Evaluation and Research Agency, or DERA. A lack of clarity on contractual arrangements at the outset didn't help, allowing private equity company Carlyle to hammer the price down (why would you start negotiations when you didn't know the company's true value?). The Ministry of Defence behaved, it was said, like "an innocent at a table of card-sharps". Estimated cost to the taxpayer - £90 million. Huge sums were later made by QinetiQ management when the company listed.
The TaxPayers' Alliances estimates £2.7bn worth of taxpayer cash was wasted with a super-expensive 'National Programme for IT in the NHS'. The Department of Health, in the end, had very little to show for it as a consequence. Another example of poor management and a seemingly ingrained inability to provide taxpayers' with value for money.
"BT is paid £9 million to implement systems at each NHS site, even though the same systems have been purchased for under £2 million by NHS organisations outside the Programme", the Commons Public Accounts Committee noted.
Contentious. The Office for National Statistics estimated this has declined 3.4% since 1997, "with inputs increasing by 38%." The Centre for Economics and Business Research estimate that this inefficiency costs the taxpayer £58.4 billion a year.
Given the above record, are there any deals that the taxpayer has actually won out on? Not many, but the one successful project was the roll out of new Jobcentre Plus offices. It came in £314 million under budget, claims the Taxpayers' Alliance. A small cheer.