Reply #3: Hardly anything. There's a SCOTUS case about this . . .

[TaleWgnDg]

and the threshold is very very low. Something about "intent to reside" plus a reasonableness standard. Like, uuummmm, a utility bill w/ your name on it, an affidavit from an at-will (w/o a lease) landlord, a signed lease from a landlord, a voting registration, a car registered in Massachusetts, less likely would be a job since the New England state borders are so close, etc., etc. Those are examples of how to legally "prove" that you have an intent to reside in a state.

Timeframe would be interesting. What if you had demonstrated an "intent to reside" then move out of state? Well? It would then kick in the reasonableness as to time u/ your facts and circumstances. The fall down would be that your marriage would become null and void if you didn't comply w/ the law and this SJC ruling.

edited for a typo.