In addition to the fees outlined in your cost calculator, are any additional "clearing" fees added in the statements? Has happened to me in the past with other brokers...Great!
Unlike other brokers, that separate their commissions from all other fees such as Exchange, NFA & Platform and Routing Fees – AMP has combined all the fees into this Simple, Easy to Use Exact Cost Calculator. This will be the Total All Fees Included Cost you will see on your AMP Trading Statement.
Please follow this wizard to view the Exact All-In Cost for your preferred trading platform: https://portal.ampclearing.com/account/commissionquote.aspx