incidental

(frequently plural) an expense not budgeted or not specified; "he requested reimbursement of $7 for incidental expenses"

an item that is incidental

(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence; "incidental expenses"; "the road will bring other incidental advantages"; "extra duties incidental to the job"; "labor problems incidental to a rapid expansion"; "confusion incidental to a quick change"

not of prime or central importance; "nonessential to the integral meanings of poetry"- Pubs.MLA

following or accompanying as a consequence; "an excessive growth of bureaucracy, with attendant problems"; "snags incidental to the changeover in management"; "attendant circumstances"; "the period of tension and consequent need for military preparedness"; "the ensuant response to his appeal"; "the resultant savings were considerable"