I know this has been asked before, but of all the posts and responses I'm still either left with additional questions or the question itself isn't even answered.

If a vendor offers a 2% early pay discount, can I just record that on a separate line when entering the invoice (assuming I'm paying within those terms)?  And what account should should I set up to post these to (is it an income or expense)?

Is it incorrect to just reduce the expense account by the discount amount?  Ultimately, I'd like to handle this at the point I enter the invoice as creating a credit memo is an extra step and nuisance.