@radcliff – not sure where you’re from, but here in MN you will get an automatic COLA (cost of living adjustment) every two years.
In between you can AT ANY POINT request to have a review of the enforcement of your decree at no cost to you and without having to go to court. Just pick up the phone and talk to your case worker.
I know this from the other side of the equation – I’m married to a man with an ex. We have his daughter 99% of the time and we have paid all health insurance/medical/dental/clothing/schooling expenses—and we were still paying (a lot) to his ex each month.
Once my husband became unemployed all it took was one phone call to the case worker. (And then a lot of paper work) His ex had to submit W2s and recent pay stubs, my hubby did too. I had to provide proof of insurance for my stepdaughter and the records showing we’d always covered this expense..even though per the decree his ex-wife was supposed to have paid this expense.)
They found a BIG discrepancy (she was being paid a lot more than in their original decree from 10+ years ago—and good for her that she was!) and reduced his payment by a lot.
Works the same in reverse in our state, too—according to some other stepmom’s I know…they can adjust his payment “upwards” if they find he’s earning more and you’re earning less. There are simple online calculators for many states as well.. (though my example is again, specific to my home state).