From Revenue
In relation to average pay over the previous 36 months for a SCSB calculation, SCSB is determined on the average for one year of the holder’s emoluments of the office or employment for the last three years of service before the relevant date. Section 993 of the TCA, 1997, defines "emoluments" as anything assessable to Income Tax under Schedule E, and references to payments of emoluments include references to payments on account of emoluments.
I guess it is covered under the payments on account of employment. They specifically confirmed MB and IB in the note.