The thing that jumped out at me was that the OP could easily drop his retirement savings for now. That would give him $1050 per month after child support and fixed expenses. That seems eminently livable to me. And if the kids are 2 and 4, the OP is probably fairly young. If he’s already making $100K, he’s got plenty of time later to ramp up his retirement savings.
The other thing that jumped out at me was that Maryland is crazy expensive - especially for child care. Child care here in Edmonton is about $600/mo. Maybe $800-$1000/mo in the best places. Is $20,000 per year really the cheapest day care you can find? Or is this some gold-plated place for the kids of rich yuppies?
Also, you say that your other kid is in pre-school which cost $18,000 per year. That means you were paying $38,000 for two children to be in institutional care? I imagine you could have hired a nanny for that kind of money.
In any event, will your children not still need after-school care once they are in school? You said your wife doesn’t get home until late, and neither do you. It sounds to me like you’ll need after-school care for the kids, which can cost about half of what day care costs. Have you factored that in?
I think the root problem you have, and why your child care expenses are half of your income, is that you were spending a huge amount of money for your kid’s care. Your townhouse sounds reasonable, and the $1600 rent doesn’t seem out of line, but those child care costs are insane.
Anyway, cut the automatic retirement savings, spend what you have to, and then put whatever is left into your 401(k). You should be able to live reasonably well on $1050 per month for groceries, utilities, and spending money.
I take issue with this. If a man (or a woman) moves into a household with children, they are making a commitment to those kids. It doesn’t matter who the genetic father is - it’s about the kids. The whole point to child support is to make sure the children’s lifestyle and care is not unduly damaged by divorce. If another man or woman comes into the picture and takes on a parental role, that should let the original parent at least partially off the hook.
To me, the unfair situations occur when one spouse remarries and returns to the kind of family income that was enjoyed before the divorce, while the other parent is bled dry with his or her money becoming extra income for the other family. This is damaging in a number of ways. First, I think it’s unjust. But second, if one parent is now living on half an income while the other is living on two and a half incomes, the standard of living disparity can grow large, which can affect how the children relate to the parents.
And it cuts both ways - if the kids actually like the poorer parent (or dislike the new mom/dad), then they’ll come to see the setup as being unjust, and grow to resent the custodial parent.
To me, a man moving into a family household and living free while someone else pays the bills is just as much a freeloader as a deadbeat dad who skips out on the kids. If it were me, I wouldn’t care what the law said - if I took on someone else’s kids as my own, I would not expect the ex-husband to pay for the kids any more, other than whatever costs he incurs when they are in his custody.