incidental

incidental [ in-si-DEN-tl ]
[ noun, adjective ]

MEANING :
1. (adj.) incurred casually and in addition to a regular
2. (adj.) insignificant or subordinate in nature
3. (n.) minor expense

USAGE EXAMPLE 1 :
The company reimbursed the salesmen for incidental expenses incurred.

USAGE EXAMPLE 2 :
Although to our audience, I have been Phil Archer for the majority of my adult life, my Archers salary always went down on my tax returns as incidental earnings.