Do you include sunk costs in capital budgeting?
Andrew Mclaughlin
Published Feb 21, 2026
Capital budgeting decisions are based on current and future incremental cash flows and not any past cash flows. Therefore, in calculating net initial investment outlay, analysts need to ignore the sunk costs but include opportunity costs in their analysis.
Should sunk costs be included in the cash flow of a project?
Since sunk costs are costs the firm has already incurred, they shouldn’t be included in future cash flows. The $50,000 is a sunk cost that occurred in the past and shouldn’t be included in the cash outflows for determining project profitability.
What do the sunk costs include?
Sunk costs are those which have already been incurred and which are unrecoverable. In business, sunk costs are typically not included in consideration when making future decisions, as they are seen as irrelevant to current and future budgetary concerns.
What is not included in capital budgeting?
Unlike some other types of investment analysis, capital budgeting focuses on cash flows rather than profits. Conversely, non-cash expenses like depreciation are not included in capital budgeting (except to the extent they impact tax calculations for “after tax” cash flows) because they are not cash transactions.
Why sunk cost are considered irrelevant cost?
A sunk cost is a cost that cannot be recovered or changed and is independent of any future costs a business might incur. Because a decision made today can only impact the future course of business, sunk costs stemming from earlier decisions should be irrelevant to the decision-making process.
Can a variable cost be a sunk cost?
Variable Sunk Costs Once a variable cost is incurred and cannot be recovered, however, it becomes fixed in sunk terms. By definition, $1,000 worth of variable costs are sunk if they cannot be recovered; once incurred, the realized sunk costs become fixed. It cannot be changed.