Lesson 4.2: Capital Budgeting Basics

Lesson Overview

Capital budgeting is the process companies use to decide how to spend money on long-term projects. These projects often require cash up front and deliver benefits over years, so mistakes can be costly and hard to undo.

In this lesson you will learn the practical workflow used to evaluate investments: define the project, estimate incremental cash flows, consider timing and risk, and apply clear decision rules. You will also learn common traps that cause teams to overestimate returns or ignore hidden costs.

Learning Objectives

• Define capital budgeting and explain why it matters for firm value.
• Describe a step-by-step project evaluation workflow.
• Estimate incremental cash flows at a high level using a simple structure.
• Distinguish between cash flow and accounting profit when evaluating projects.
• Identify sunk costs, opportunity costs, and externalities in project analysis.
• Explain why working capital and terminal value matter.
• Recognize uncertainty and how scenario thinking improves decisions.

What Counts as a Capital Budgeting Decision?

Capital budgeting applies to any decision that requires meaningful up-front investment and produces future benefits over time. Examples include:

• Opening a new store or facility
• Buying equipment or upgrading technology
• Launching a new product line
• Entering a new geographic market
• Acquiring another company or divesting a division
• Major maintenance or renovation projects

The shared feature is that these decisions are long-lived and difficult to reverse, so careful analysis is worth the effort.

The Core Idea: Only Incremental Cash Flows

The golden rule of capital budgeting is simple: Include only cash flows that change because you do the project.

This sounds obvious, but it prevents two of the most common errors: counting things that will happen anyway, and missing costs that are real but not recorded as obvious expenses.

A Practical Capital Budgeting Workflow

1. Define the decision: What are we choosing, and what is the alternative?
2. Map project timing: When do cash outflows and inflows occur?
3. Estimate incremental cash flows: Up-front, operating, and ending cash flows.
4. Adjust for risk: Consider uncertainty, scenarios, and required returns.
5. Apply decision rules: Use NPV, IRR, payback, or profitability index as appropriate.
6. Stress test: Identify what must be true for the project to succeed.
7. Decide and monitor: Compare actual results to the plan and learn for next time.

Building Blocks of Project Cash Flows

1) Initial Investment (Time 0)

The initial investment is the cash spent to start the project. It can include:

• Capex: equipment, construction, software, or acquisition purchase price
• Installation and setup: training, integration, permits, and testing
• Incremental working capital: additional inventory or receivables needed to operate

2) Operating Cash Flows (Years 1 to N)

Operating cash flows reflect the project’s ongoing impact. A common high-level structure is:

• Incremental revenues
• Minus incremental operating costs
• Minus taxes on incremental operating profit
• Plus non-cash expenses that reduced profit (such as depreciation) because they affect taxes
• Minus incremental reinvestment and working capital changes as needed

In later lessons, you will learn a clean format for converting operating performance into free cash flow.

3) Ending or Terminal Cash Flows (Final Year)

Projects often have “end effects” that matter a lot:

• Salvage value: selling equipment or assets
• Cleanup or shutdown costs: decommissioning, legal, environmental, severance
• Working capital release: inventory sold off, receivables collected
• Continuing value: if the project continues beyond the forecast window

Cash Flow vs Accounting Profit

Capital budgeting is based on cash flows, not accounting profit. Accounting rules help standardize reporting, but project decisions require a cash perspective.

• Revenue might be recorded before cash is collected.
• Expenses might be recorded even when cash is not paid yet.
• Depreciation reduces accounting profit but is not a cash outflow, though it can reduce taxes.

This is why a profitable project on paper can still create cash strain in real operations.

Three Costs People Often Get Wrong

Sunk Costs

A sunk cost is a cost that has already been paid and cannot be recovered. It should not affect the decision, because it does not change no matter what you do next.

Opportunity Costs

Opportunity cost is the value of the best alternative use of the resources. If a project uses a building you could rent out, the lost rent is a real cost of the project even if no money changes hands.

Externalities and Spillovers

Projects can affect other parts of the business. For example, a new product might increase sales of an existing product (positive spillover) or steal customers from it (cannibalization). These effects belong in the analysis because they are incremental to the firm.

Working Capital: The Hidden Cash Drain

Working capital is the cash tied up in running the business day to day, such as inventory and receivables, net of short-term payables. Many projects require working capital to grow before profits show up.

A simple intuition:

• More inventory and receivables usually means cash out.
• More payables usually means cash in (temporarily).
• At the end of a project, working capital is often released, creating a cash inflow.

Taxes Matter (Even When You Wish They Did Not)

Capital budgeting is done on an after-tax basis because taxes are real cash outflows. Two project elements commonly affect taxes:

• Operating profit changes taxable income.
• Depreciation can reduce taxable income, creating a tax shield.

In later lessons, you will see how tax shields relate to the cost of capital and financing choices.

Risk and Uncertainty: Scenarios Before Spreadsheets

Forecasts are always wrong; the goal is to be wrong in useful ways. Before building a detailed model, define:

• Base case: your best estimate of what will happen
• Upside case: what success looks like and what causes it
• Downside case: what failure looks like and what causes it

Scenario thinking helps you identify what truly drives outcomes. Often, a project’s result depends on one or two key variables: pricing, adoption rate, utilization, or cost inflation.

Capital Rationing and Why Not Every Good Project Gets Funded

Many firms face a constraint: limited capital, limited talent, or limited management attention. This creates capital rationing: projects compete for scarce resources.

When rationing exists, the question shifts from “Is this project good?” to “Is this the best use of our limited capacity right now?”

Mini Example: Incremental Thinking

A company considers buying a machine that costs $200,000. It expects the machine to increase annual sales by $120,000 and increase annual operating costs by $60,000. It also requires $20,000 of additional inventory.

Even without full math, you can already see the structure:

• Initial cash outflows: $200,000 for the machine, plus $20,000 in working capital.
• Ongoing impact: additional revenues and costs, adjusted for taxes.
• Ending: potential resale value of the machine and recovery of the $20,000 working capital.

The next lesson introduces the decision tools that convert those cash flows into an accept or reject answer.

Key Terms

• Capital budgeting The process of evaluating long-term investments.
• Incremental cash flow The cash flow that changes because of a decision.
• Sunk cost A past cost that cannot be recovered and should not affect the decision.
• Opportunity cost The value of the best alternative use of resources.
• Working capital Short-term operating assets minus short-term operating liabilities.
• Terminal cash flow The end-of-project cash flow including salvage and working capital release.
• Cannibalization When a new project reduces sales of an existing product.

Practice: Check Your Understanding

1. What does “incremental cash flow” mean in your own words?
2. Give an example of a sunk cost and explain why it should be excluded.
3. Why can working capital create cash problems even in a growing, profitable project?
4. What is an opportunity cost in a capital budgeting decision?
5. Name one spillover effect that could occur when launching a new product.

What’s Next?

In Lesson 4.3: NPV, IRR, and Payback Methods, you will learn the main decision tools used in capital budgeting and the situations where each one can mislead.