Ah, one-time tax rate adjustment. IIRC, that's what was done the previous time.
As for spending mine, it'll go into the account and be used for regular expenses such as the house payment (whoosh, it's spent) ... not for anything special. I quit buying much "special" a year ago when I lost the day job. I received a $50 Amazon certificate for Christmas and still haven't used it because it feels more valuable to keep it, LOL.