How To Write A Letter Terminating My Employment . First, due to the termination of your employment, if you return to the workplace, your presence will be considered trespassing. You should also mention all company information relevant to that employee. Free Termination Letter for Poor Performance Templates & Examples from templatesection.com A good letter tells employees how the company intends to handle these issues and to whom the employee can speak about them. No matter the reason or reasons for leaving, remain polite and avoid any negativity in the termination letter. No employee should be taken by surprise if they’re terminated.