"TCJA changes alimony tax treatment only for alimony orders pursuant to an instrument of divorce entered after December 31, 2018. Couples planning to divorce may want to hasten their proceedings — or at least their drafting and signing of divorce instruments to take advantage of pre-TCJA alimony tax treatment. An instrument of divorce must specify periodic payments and the parties must reside in separate households. Experts believe an instrument signed before December 31, 2018, will qualify for pre-TCJA tax treatment, even if the divorce is not yet final. If the parties sign their divorce instrument before the end of this year, they can also agree to pre-TCJA tax treatment for any subsequent modification of their alimony arrangement. In that way, couples who sign an alimony instrument of divorce before December 31, 2018, can preserve the deductibility of alimony far into the future."