Money is a sensitive subject for all couples. There are major gender differences with everything money related and that in itself creates tensions.
Women view money as a mean for a greater purpose and men view money as it is. We need both perspectives to balance each other, this is why it is very important to find tricks to make sure conversations regarding money are constructive.
My recommendation is this: email. When you put in writing the bulk of what you feel about a sensitive subject, you are much more to the point and you leave the other one digest your information before he or she gives you his/her own view. Once everyone has pondered the other one’s perspective, the conversation is likely to be fruitful and respectful.
Have a great week-end!