Ireland is expected to tell its European Union partners at a summit next week that it needs guarantees on taxation, family law, neutrality and the right to nominate a European commissioner as its price for ratifying the EU’s Lisbon treaty.

But some of the EU’s other 26 countries may express frustration with Ireland if Brian Cowen, the Irish prime minister, avoids committing himself to a deadline for approving the treaty, which Irish voters rejected in a referendum in June.