Mr Cameron wants cuts to business regulation, protection for the non-eurozone single market, and a UK opt-out from the bloc’s policy of “ever closer union”.
The PM’s most high-profile demand is however a restriction on EU migrants’ access to in-work benefits like tax credits for the first four years they live in the UK.
This final point is expected to be a major stumbling block for the PM, with other EU leaders having told him they do not see “eye to eye” on the issue. Unanimous agreement would be required to change the EU’s treaties.
Ukip’s leader said the talks would likely leave the UK subject to the parts of the EU he was opposed to.
“I do believe Britain should govern itself, I do believe in national democracy, and I do believe that like Australia and other countries we should be able to govern who comes into our country,” Mr Farage told BBC Radio 4’s Today programme.