How do major credit-card issuers calculate minimum-due payments each month?

There are variations on each issuer’s minimum-due formulas The Office of the Comptroller of the Currency (OCC), which regulates national banks, suggested in 2003 a standard which most banks did not adopt until December 2005.  Bank of America, MBNA, Citibank, and Wells Fargo all have adopted this formula.  But other card issuers adopted a different take of the OCC's guidance.

Chase credit cards require a minimum payment due that's the greater of either the OCC formula (1% of the balance due, plus interest charges and fees) or 2% of the balance due.  Capital One has been using the same formula for years and takes the greater of $15 or 3% of the balance including finance charges and fees.  It seems you pay a higher monthly minimum payment with Capital One versus the other issuers if they give you a larger credit limit and in most cases they don’t.