Can she do this?

Thanks spaz.  That's kind of what I thought.  Ugh!

But what about if my youngest child turns 18?  She will be 18 at the end of this month.  Can the ex still claim non-payment after the child is 18?  If so, for how long?  I don't want to get dragged back in court 5 years from now because the ex gets pissed at me.

Ok, you might be screwed - unless you gave your ex a check and on it you wrote CHILD SUPPORT so you can prove it was actually child support, and not you just giving your ex money for whatever reason - the court will probably not recognize it as child support.

Also, you gave it to the child, not your ex - and your ex is the one who legally is supposed to be receiving child support, not the child directly.  

She has every legal right to file against you, morally she is corrupt, but according to the laws the system has in place regarding child support - your "verbal agreement" means nothing, and how you have been "paying" all these years - is not in accordance with any child support guideline whatsoever.

Get an attorney, they may be able to get you out of the mess you managed to create, but try to fight it on your own and you will be completely screwed.

I can document every payment through bank records, but according to her, it didn't matter because I transferred the money into my daughter's account instead of giving it to her.

what?  that's crazy.  who does that? who thinks they can just do that?

as long as you have receipts that show every month, on time, the exact same amount, or more, has been deposited into this savings acct...i think you're set.

going forward, get it all in writing.

Been keeping receipts? Never have a verbal agreement, legal system hardly recognizes such things. Get it in writing. But if you have receipts to show the payments or deposit records with the bank?