As a follow-up to my last posting about combined exclusions of $10 Million, I would not recommend giving up those formula clauses, yet. For one thing, if Spouse A dies in a $5 Million year, the spouse gets the exclusion in that year and it is locked in. The estate can grow for the benefit of the surviving spouse, children and grandchildren for at least two generations (since the GST inclusion ratio is 1.0). If the other spouse dies later having remarried a wealthier new spouse, that would be lost if it were jointly titled. So, its good to keep those formula clauses intact.