If I am writing a formal letter and I want to say thanks in the last sentence, what are some ways that I could word it without sounding awkward?

2 answers

I appreciate your assistance in this matter.

Thanks in advance.

Thank you for considering my application.

I don't know... it depends on what you're writing about. The first one usually does the trick, but you will probably want to make it more specific.
Thank you for your time and attention in this matter.