Spouse and I signed a sep agreement on 7/27/16. she gets 761.34 of my mil pension. Is that considered alimony that I can deduct or is that income she has too claim.

My spouse and i are not divorced yet but we both signed a separation agreement on 7/27/16.  I was wondering if we have to file separate?  I give her $1000 alimony and $761.34 from my mil pension.  Is the $761.34 considered alimony because the divorce not final or income.  I get the whole pension then give her what we agreed upon.  Divorce will be filed 1/2017 in Virginia.  Thanks for the assistance.