My wife and I have been married for eighteen years, and have very open and honest communication. We don't hide things from each another, and I believe that this honesty strengthens our love for each other and allows us to trust. I am convinced that hiding or lying about little things (like money spent) can begin the process of a disintegration of trust. I know it sounds dramatic, but honesty in small things is important.
Do the majority of married people hold private bank accounts; joint bank accounts; or both? I would be interested in knowing.
My wife and I have different checking accounts for different purposes. All of our accounts are technically joint, and we have online access to all of them. With that said, my wife and I primarily operate out of separate checking accounts, to avoid collisions. We do not hide any purchases from each other, other than gifts. There are no financial secrets. My wife doesn't tell me every penny she spends, nor I her, because the information is often irrelevant. But for extraordinary purchases, we are both informed.