[Here briefly describe on Farewell Letter sample format to Boss who is Leaving. You can follow this sample farewell letter for a boss on his promotion and increment or change of country or department etc. You need to modify this sample according to your needs.]
Date: DD/MM/YY
Boss name…
Job Designation…
Department name…
Company/Institute name…
Subject: Farewell Letter to Boss in Advance
Dear (Sir),
I am very happy to know about your increment and promotion. I came to know that from mid of the (Month name) you will work for (Abroad branch name) and going to shift in (City nad Country name) next month. Surely this is very happy news for you and your family. (Describe in your words).
I still remember the first day of my job as a (Job designation), (xyz) years back and you were the person who welcomed me. You teach me each and everything about the company. You treated me like an elder brother. (Describe overall situation). You always helped me in any uphill task that appeared before me. I always enjoyed working under your kind supervision and never thought my work boring. Not only I but you were like a father for all other employees in our department. (Explain actual situation).
But as this is obvious that there is nothing permanent here. Everyone has to move on in his life. The day has come for us to say goodbye for now. The earth is round and I hope someday we will meet again. (Explain your expectation regarding farewell).
I pay you to regard the precious contribution that you have made in the progress of the company. I congratulate you for your promotion and transfer in (City and country Name) and I also wish you the best of luck for your future. (Cordially describe your wish and greetings). Please accept my farewell wishes in advance. I have also tended to give you and your family a farewell party.
Best Regards,