Specifies the basis or unit used to calculate the commission.
| Code | Meaning |
|---|---|
| 1 | Amount per unit |
| 2 | Percent |
| 3 | Absolute |
| 4 | Percentage waived, cash discount basis |
| 5 | Percentage waived, enhanced units basis |
| 6 | Points per bond or contract |
| 7 | Basis points |
| 8 | Amount per contract |