The prime minister is setting out plans to curb welfare benefits for migrants from the EU.
David Cameron will say EU migrants should have to wait at least four years before receiving benefits such as tax credits or council houses.
He will insist the changes, which he will seek if he is elected in May, are an "absolute requirement" in future talks over whether to stay in the EU.
It follows news that net migration to the UK has risen above 2010 levels.
In a long-awaited speech in the West Midlands, Mr Cameron will say he is confident that he can change the basis of EU migration into the UK and therefore campaign for the UK to stay in the EU in a future referendum planned for 2017.
But he will warn that if the UK's demands fall on "deaf ears" he will "rule nothing out" - the strongest hint to date he could countenance the UK leaving the EU.
The main proposals in the speech - which are dependent on Mr Cameron remaining in power after May's general election - are:
Stopping EU migrants from claiming in-work benefits, such as tax credits, and getting access to social housing for four years
Stopping migrants claiming child benefit and tax credits for children living outside the UK
Removing migrants from the UK after six months if they have not found work
Restricting the right of migrants to bring family members into the UK
Speeding up deportation of convicted criminals
Longer re-entry bans for beggars and fraudsters removed from the UK
Stopping citizens from new countries joining the EU from working in the UK until "their economies have "converged more closely" with existing members.
Mr Cameron will say the UK public's concerns about levels of EU immigration over the past decade are "not outlandish or unreasonable" and the changes will create the "toughest welfare system" for migration in Europe.
"We deserve to be heard and we must be heard," he will say. "Here is an issue which matters to the British people and to our future of the European Union.
"The British people will not understand - frankly I will not understand - if a sensible way through cannot be found, which will help settle this country's place in the EU once and for all."
'Cap dropped'
BBC political editor Nick Robinson said Mr Cameron's welfare curbs were "a tougher version of an approach already set out by Labour and the Liberal Democrats" but the proposed four-year limit on benefits would be difficult to negotiate in Brussels.
But he added that ideas of a cap on the numbers coming in had been abandoned amid the realisation he could not get support from other EU leaders for it.
- September 21 2026
UK family visa generally requires you to meet the MIR (Minimum Income Requirement). This means when you apply to enter the UK or remain here ...
- September 21 2026
The Home Office published the statement of Changes to the Immigration Rules – HC584 on 3 September 2026. The statement contains several change...
- September 14 2026
If you are a UK employer and have applied for a sponsor licence, you would like your application to be successful. You should note that to inc...
- September 9 2026
Renouncing your British citizenship is a big decision in your life. Before taking this step, you must consider it carefully. However, once you...
- September 3 2026
Curtailment of your permission (leave to enter or leave to remain) means shortening the period for which your existing immigration permission ...
- August 27 2026
From 1 October 2026, significant changes to the UK's Right to Work (RtW) Scheme come into force. These updates expand employer responsibilitie...
- August 24 2026
Visa refusals are real, so are the remedies to them. It is best that you take an expert’s help from the beginning to avoid any visa refusal. B...
TBXH Sunley House, 4 Bedford Park, Croydon, CR0 2AP