“Both spouses need to know basic things about family finances, no matter who handles bills or long-term investing. That means looking over tax returns, knowing about the bank accounts, keeping tabs on everyone’s retirement balance and making joint decisions about big financial moves like buying a house.” I would also add estate planning, women especially. 2 out of 3 women are widowed at age 64 and it is vital to know how the plan works, who your advisors are, and where to locate important documents.

https://www.reuters.com/article/us-money-divorce-finances/your-money-avoid-divorce-money-regrets-by-taking-control-now-idUSKBN1ZD0EA