Learn English – Is it correct to use “too” in “Same to you, too” for emphasis

I've heard congratulations used in birthday greetings, or in wishing someone a happy new year, but it's generally intended to be somewhat humorous.

When I've heard it used, the implication has been: Congratulations! You made it through another year. Put another way: It's been a whole year and you're still alive. Congratulations.

Some might consider such "congratulations" to be morbid humor, particularly if the person you are talking to is quite advanced in age.

As for saying,

"Congratulations, I didn't know that."

I'd be careful with that one. It sounds like a sarcastic remark given to someone who has just stated something obvious.

As for:

"Happy new year in advance"

that sounds normal and idiomatic to me. Another more casual way you could say the same thing is:

"Have a happy new year!"

By putting the "Have a" at the start of the remark, you're acknowledging that the new year is coming soon but is still a little ways away.

Same to you.

Same to you, too.

Both are correct. However, the former is far more usual and idiomatic than the latter as the use of the "too" is redundant in this phrase. 6 When you wish the same thing to somebody as they wish to you, you usually say "Same to you".