It is important to have a one-year checklist before retiring overseas because there are many things that need to be done in order to ensure a smooth transition. Some of the items that should be included on the checklist are: researching the best place to retire, getting passports and visas, arranging for healthcare and insurance, and downsizing or selling your home. By taking the time to do these things in advance, you can avoid any last-minute stress and make the transition to retirement easier.