The Tax Cuts and Jobs Act (TCJA) was an excellent bill that reduced taxes. However, the bill also removes the tax deductibility of alimony paid. This creates a problem because on the 1040 form, for a divorced alimony payer, the AGI line is now inflated. Example, you bring home 10K a month and pay 5K in alimony (not out of the ordinary in some states). In the past your 1040 AGI would say something like 60K a year because the alimony was deducted. Now in this situation your AGI is 120K even though your wages are garnished, and you only see 60K.
The problem is that to qualify for many programs, it is based on your 1040 AGI. So now with TCJA your AGI is now 120K when in the past, all things the same it would be 60K. So, the AGI is not accurate. Even if the alimony is not tax-deductible it should at least reduce your AGI for the purpose of representing you disposable income which is important to be accurate.
The stated goal of this provision was to cure the reported “gap” between what is reported as paid and what is actually paid. This is a bogus motivation as now all alimony and child support are paid to the state and the state sends to the receiver. Thus, there is no longer a gap. The gov has an accurate record of what was paid, to whom, and how much.