Disagree. Easier to negotiate big joint expenses than erratic personal expenses.

It absolutely is yours, your partner can’t access your private accounts without your permission unless they take you to court, which happens mostly in the context of divorce.

This is great advice, made us both much happier in our marriage. Sure it’s possible to share an account and make it work, but that definitely doesn’t work for everyone. It’s much harder to go from sharing one account to splitting, because the suggestion is always taken personally. If you’re in a new relationship and especially if you are someone who is high income, frugal, or an aggressive saver, do your self a favor and follow this tip from day 1.