I am pretty sure this is going to make a lot of wives ponder or ask, "Why do you want to know anyway?".
Do you have your husband's ATM? Does he give you his pay envelope straight from the payroll releasing clerk?
I don't have my husband's ATM nor do I ask him to give all his earnings to me. Here's why.
It's his money and he has primary right to it.
I didn't ask for his ATM nor his whole paycheck turned over because I recognize that it is he who worked hard for that money. Personally, for as long as he provides well for the family's needs, I don't have to know how much he earned. Now that I'm writing this article, I actually don't remember how much his salary is. Although he does show me his yearly tax returns and salary adjustment documents.
In my opinion, when you take someone else's card, it's sort of intrusive and selfish. Yes, you're married but I believe that there are still things a married couple should retain like their individuality, friends, family and a whole lot of personal things. I think this decision not to mind my husband's finances stems from my own capability to earn money and my husband's good reputation in being trustworthy and faithful.
At the same time, I know of husbands who really voluntarily "surrender" or endorse their entire income to their wives.
For me, getting married does not, or did not, mean giving up these kinds of things. There are still parts of your life that should remain yours.