As per the basic principles of costing, a relevant cost is a
cost that is basic to decision making. Such cost has the ability to
change the course of decision making and select an alternative best
suited to the budget. In other words, it is a future cash flow that
arises as a direct consequence of decision making. The main intent
of relevant costing is to determine the objective cost of decision
making. The varied principles are :
- Future Costs : Relevant costs are future costs
that would happen in the future due to execution of the decision
made. Since these cost are future based the costs already incurred
are known as the sunk cost. Such sunk costs are irrelevant to
decision making.
- Cash Flows : The relevant costs are future
costs that result in probable outflow of cash. This means that the
costs that do not result in outflow of cash are to be ignored such
as depreciation and notional costs.
- Incremental In nature : Relevant costs are
incremental costs in nature. For eg. An employee is paid $ 200 for
a work week irrespective of the work he does. If he does nothing he
will be paid $ 200 and if the manager decides to give him a task
that earns the company $ 60 then the net gain here is $ 60. The
employee would be paid $ 200 in either case whether he is free or
working on the task. So $ 200 here is sunk cost and $ 60 is
relevant.
If you the above answer carefully, you figure out that relevant
cost is nothing but "Future incremental cash flow".