EDIT 2: he original answer at the bottom is now incorrect. The correct section of the linked source file (current 30/12/2019) is:

Gofmt formats Go programs. It uses tabs for indentation and blanks for alignment. Alignment assumes that an editor is using a fixed-width font.

Thanks to TehSphinX for pointing this out!

ALL INFO BELOW THIS LINE IS NOW INCORRECT

EDIT: The original answer at the bottom is now incorrect. The correct section of the linked source file (current 25/07/2014) is:

Gofmt formats Go programs.

It uses tabs (width = 8) for indentation and blanks for alignment.

Original answer (deprecated):