French to English Bus/Financial Human Resources

This phrase is taken from a document dealing with payroll systems.

In a section dealing with the timeline for making payments, the following footnote is added:

"Sauf si le Client a confié à [name] le soin de transmettre directement les déclarations aux OPS pour son compte. [name] s’engage à intégrer les éventuels compléments de bases et/ou les montants provenant de ****traitements hors paie****, à la condition qu’ils lui soient transmis au moins 7 jours ouvrés avant la Date d’Exigibilité."

Does this refer to outstanding salary payments? The use of "montants" makes me lean towards this rather than "non-financial rewards" which had been my initial thought.

Any advice gratefully received.

Thanks,

George