Can a husband legally deny his wife access to all bank accounts and credit cards?
Yes the husband can do this, until and unless the wife initiates or files for divorce and in the course of that divorce gets a court order restoring her access and/or requiring him to otherwise provide money to her. While a marriage is going on, the law does not get involved (and cannot get involved, since there is no court case to give the courts power or jurisdiction over the matter) in a couple's internal financial or domestic relationships; only when divorce begins can the courts step in and ensure that spouses are properly supported and get a share of the assets. The wife should consult with a family or divorce law attorney about possibly divorcing.
Until a divorce is filed, one spouse can deny the other spouse access to bank accounts, etc. if they are held solely in their name. Once a divorce is filed, then the court can order that support be paid based onthe circumstances. Obviously joint accounts cannot be restricted by just one spouse.