Agreed ... if you are claiming the kids on your return then you must have the information on the 1095-A and you and the ex must agree on how the PTC is allocated between your and their tax returns. Between both of you it must be 100% but you can allocate it any way you both can agree to. If they have already filed and took 100% then you will only take 0% unless you wish to have a fight on your hands. Of course, if you can agree to work together, then you both could win.