oncost

/AA0 NG K AA1 S T/
noun
  1. 1

    Additional costs; extra expenses.

  2. 2

    Overhead (expense)

  3. 3

    (coal-mining) The cost of upkeep, making and maintaining shafts, roads, pumping, etc.

  4. 4

    The indirect expenditure incurred for the purpose of increasing the productive power of organised labour.

Source: https://en.wiktionary.org/wiki/oncost