How soon after an interview do you send your thank you note?

I recommend sending a thank you note within 24 hours after an interview. 

Sending a thank you note after a job interview might seem like an unnecessary formality, but many employers and recruiters would disagree. According to a recent survey, one in five say that they’ve rejected candidates based solely on the lack of a thank you note. More generally, 80% said that they factor thank you cards into their decision-making process. 

 Far from a formality, hiring professionals view thank you cards as basic interview etiquette. It’s not that they have fragile egos and require thanks for doing their job. Instead, they understand that sending a thank you card demonstrates that an applicant is self-aware and willing to play by the rules. Sending one certainly won’t win you a job, but not putting one in the mail could negatively impact your chances. 

And if you’re going to send a post-interview thank you, you should try to craft as strong a message as possible.

Your thank you card is the last impression you’ll leave after your interview, so you want it to be effective.