Formal:
* நிர்வாக உயர்வுக்கு வாழ்த்துக்கள்! (Nirvaaga uyarvukku vaazhththukkal!) - This translates to "Congratulations on your promotion!" and is a very formal way to say it.
Informal:
* உயர்வுக்கு வாழ்த்துக்கள்! (Uyarvukku vaazhththukkal!) - This is a more informal way to say "Congratulations on your promotion!" and can be used with friends and colleagues.
* நல்ல வேலை! உயர்வுக்கு வாழ்த்துக்கள்! (Nalla velai! Uyarvukku vaazhththukkal!) - This means "Good job! Congratulations on your promotion!" and is a more casual way to express your congratulations.
More specific:
* உங்களுடைய புதிய பதவிக்கு வாழ்த்துக்கள்! (Unggaludaiya pudiya pathavikku vaazhththukkal!) - This means "Congratulations on your new position!" and is more specific than just saying "promotion."
You can also use phrases like:
* சிறப்பான பதவி உயர்வு! (Sirappanana pathavi uyarvu!) - This means "Excellent promotion!"
* நீங்க சிறப்பா செய்தீங்க! (Neenga sirappana seyththeenga!) - This means "You did a great job!"
The best phrase to use will depend on the context and your relationship with the person.