Is your Ex-boyfriend's name on his birth certificate... does your son have HIS last name? Hopefully not.
Next, if your Ex-boyfriend is lying on his taxes ... this is fraud. He is also using your address, does not tell where he lives, he is claiming your son on his taxes and does not live with you nor are you both married...
Keep in mind, that the IRS.... asks good citizens to turn in any liars and people committing fraud on their taxes. They actually ask people to turn in people who cheat on their taxes etc.
I would, make sure you have FULL custody. You just said you are the sole caretaker.... but is that CUSTODY... by law, by the courts?????????
My friend has an Ex... who does not tell her where he lives either and he lies and they have kids together and he is all very very suspicious.
For you, I would... turn your Ex into the IRS.
Give them his name... THEY will have his SS number... and other things... if he is working, they must have his address as well and W-4 information as well... since all employers turn in this info to the IRS.
You have to do something... he is committing crimes...
what if he takes it further... and starts identity theft or what ever?
Or, puts your name on things/accounts he opens???
You have to end this... and I would, turn him in to the IRS.
He's a jerk and you said you only tolerate him because of your son. Well... he is not being a "Dad" and I would not want a loser-jerk like that in my child's life.
All the best,
Susan