Since this is a pattern you've fallen into with him, sometimes it's easier to "own" your part in the pattern and then use this as the basis to set a new pattern.
"Dad, both of us are learning how to establish our adult relationship, and I've come to realize that there's way too much scrutiny of my finances. I've allowed this to go on, which was a mistake. I'm an adult with a husband, we are doing fine, and we're happy with how we handle our finances. This is all you need to know, and I'm asking you to not question us again". Or something similar.