We operate under a very simple Golden Rule for money management: what's mine is mine and what's his is mine!
ROTFLOL
That is a standing joke around here and certainly not true, but still funny.
Hubby and I have been married for almost 40 years, and we learned pretty early on that I am a better personal finances manager than he is. I am very detail oriented ~ he is the more global (i.e. big picture) thinker. Drives me nuts to not have a bill in the mail exactly 10 days ahead of due date, while he is lucky if he remembers it the day it is due.
Hubby is chief operating officer of a 20M company but I insist he have his own personal checking account. He has to balance it and all that ~ I do the accounting and bill paying for household. Reason being that the two or three times I let him have the checkbook for household he forgot to enter the amounts of checks, deposits, etc. He had planned to do that later and then forgot about it. And I NEVER let him justify the account ~ he figures anything close is fine.
This man is the most wonderful, considerate, thoughtful and helpful to others person I have ever met in my life ~ however, I don't want him touching the household checkbook.
To be honest (and you may begin laughing at any time), I probably am anal about our personal finances. I use accounting sheets and have in a huge 3-ring notebook every month's bills and when we paid them and in what amounts for the past 11 years. And yes, I am so frugal (i.e. cheap!) that I use both sides of the accounting sheets.
However, when someone wants info on any of it, guess who they come to??? Want to know how much we had to pay the moving company for storage for how many months? Mom can tell you. Want to know when the last payment on the van was made? Mom can tell you. Want to know exactly how much one of our children still owes us (and when and in what amount that loan is being repaid)? You get the idea ...
My accounting systems are the butt of every joke in this family, but it works for me!

Sandie