You know, the more I think about this, the more it seems like a bad idea. I mean, I want to get her involved and change the model and have her contributing, but a joint account makes me much more vulnerable than I am today.

Her creditors can come after me via the joint account. If she is reckless with the joint account, it affects me. Right now, the only way she can get at my finances is through a D action.

All advice is to not open a joint account with anyone you don't completely trust. She is definitely in that category right now.

Might just change this up to keep the model the same with proportional contributions, but have each party pay certain bills directly without actually going through a new joint account.