After checking Citizen Information and other sources, I found that the payments that are made to the ex spouse for the children can be tax deductable if they are legally enforceable. What is the simplest way to establish legally enforceable payments (recognized by Revenue)? Is there any document template for such an agreement? Should it be confirmed in the court? The details on CI are somewhat vague (for a person who is not a lawyer), so any help would be much appreciated.