Do you discount if tenant offers to pay rent in advance?

[Joe M.]

I had an applicant for one of my vacant properties ask me what sort of discount I could offer if he paid a full years worth of rent in advance.

I told him I had never been asked that before so I wasn't sure.

The rent on this particular house is $650/mo for an annual total of $7800. I was thinking maybe give him a $300 discount if he paid a full year in advance and make it $7500.

The thing I'm concerned about is what happens if he does something stupid and violates the lease in some way. Does he then forfeit all rents paid or would I be required to refund it?