Before a company can decide whether a new project is worth pursuing, it needs to answer two fundamental questions: How much cash will this project require? and How much cash will it generate? The entire capital budgeting process hinges on getting these estimates right — not just the amounts, but also the timing of when cash flows in and out.
The tool we use to answer these questions is called pro forma analysis. Rather than looking at historical financial statements, we project forward — building estimated balance sheets and income statements that capture only the pieces relevant to the project under consideration. Think of it as creating a miniature financial forecast devoted exclusively to one investment decision.
This is a detailed, multi-step process. We'll need to estimate revenues, costs, depreciation, tax effects, working capital needs, and salvage values — all for a project that hasn't happened yet. The complexity is real, but so is the payoff: a well-constructed cash flow estimate is the foundation of every capital budgeting decision.
The single most important principle in project cash flow estimation is this: only incremental cash flows matter. An incremental cash flow is one that occurs directly because of the project — it would not exist if the firm rejected the project.
This sounds straightforward, but in practice it's where most analysis errors happen. Some incremental cash flows are obvious (the cost of new equipment, the revenue from a new product). Others are subtle and easy to miss.
An opportunity cost is the value of an asset the firm already owns that you're redirecting to a new project. Even though the firm doesn't spend new money to acquire the asset, using it in the project means it's no longer available for other purposes. The project should be charged for that forgone value.
For example, if your company owns a warehouse that could be sold for $500,000, and you use it for a new project instead, that $500,000 is an opportunity cost. The same logic applies to employees: if a skilled engineer is pulled from an existing project to work on a new one, the cost of their time is incremental to the new project.
A sunk cost is money already spent that cannot be recovered, regardless of whether you accept or reject the project. Market research studies, consultant fees, site surveys — if the money is gone either way, it doesn't meet the incremental test and must be excluded.
A new product doesn't exist in a vacuum. It can cannibalize sales of your existing products (substitutionary effect) or boost sales of existing products (complementary effect). Both are incremental to the new project and must be included.
Here's a rule that surprises many students: financing costs are never counted as project expenses. This means no interest payments to debt holders and no dividends to shareholders appear in your project cash flow calculations.
Because the cost of financing is already embedded in the discount rate — the weighted-average cost of capital (WACC) that we use to bring future cash flows back to present value. If we included interest payments as project expenses and discounted at the WACC, we'd be double-counting the cost of capital.
This is why our project income statement is a "quasi-income statement" — it looks like a regular income statement but deliberately omits interest expense. We're measuring the project's operating performance, not its financing structure.
Free cash flow (FCF) is the cash a project generates after all operating expenses, taxes, and necessary investments in fixed assets and working capital. We first encountered FCF in Chapter 2 when analyzing the firm as a whole. Now we apply the same framework, but with two key adjustments:
Where OCF (operating cash flow) is calculated as:
OCF = EBIT × (1 − Tax Rate) + DepreciationNotice that we start with EBIT (earnings before interest and taxes), not net income. This automatically removes interest from the picture — consistent with our rule to exclude financing costs. We then apply the tax rate to get after-tax operating income, and add back depreciation because it's a non-cash expense that reduced EBIT but didn't actually consume cash.
Depreciation is a fascinating paradox in capital budgeting: it's a non-cash expense, yet it directly affects cash flow through its impact on taxes. The more depreciation you claim, the lower your taxable income, and the less tax you pay. That tax savings is a real cash benefit.
Before computing depreciation, you need the correct depreciable basis. Per IRS rules, this isn't just the purchase price — it includes:
All of these costs are capitalized into the asset's basis and depreciated over its useful life. A $70,000 machine with $5,000 in delivery and installation costs has a depreciable basis of $75,000 — not $70,000.
The simplest method spreads the depreciable basis evenly across the asset's life:
Annual Depreciation = (Depreciable Basis − Ending Book Value) ÷ Years of LifeIf an asset costs $75,000 with a 3-year life and no salvage value, annual depreciation is $25,000 per year. Simple, but not always the most tax-advantageous choice.
Most businesses prefer accelerated depreciation because it front-loads depreciation expenses into the early years of an asset's life. More depreciation early means lower taxes early — and since a dollar today is worth more than a dollar tomorrow, that timing advantage is valuable.
The IRS requires the half-year convention for most depreciation methods. Under this rule, any asset placed in service during a tax year is treated as though it was purchased at the midpoint of that year. This means a 3-year asset's depreciation stretches across 4 calendar years — half a year in year 1, full years in years 2 and 3, and the remaining half in year 4.
| Year | 3-Year Property | 5-Year Property |
|---|---|---|
| 1 | 16.67% | 10.00% |
| 2 | 33.33% | 20.00% |
| 3 | 33.33% | 20.00% |
| 4 | 16.67% | 20.00% |
| 5 | — | 20.00% |
| 6 | — | 10.00% |
DDB doubles the straight-line rate and applies it to the remaining book value each year. A 5-year asset has a 20% straight-line rate, so DDB uses 40%. This produces much larger deductions in early years.
The Modified Accelerated Cost Recovery System (MACRS) is the IRS's official accelerated depreciation framework. It combines the best features: DDB for 3- to 10-year property, 150% declining balance for 15- to 20-year property, and a switch to straight-line whenever it becomes more advantageous. Real estate uses straight-line with a mid-month convention.
The Tax Cuts and Jobs Act of 2017 introduced a powerful incentive: 100% bonus depreciation on qualified property placed in service between September 2017 and the end of 2022. This meant a company could immediately expense the entire cost of eligible equipment in year one — no depreciation schedule needed.
This was a significant change, especially because it expanded to include used property, not just new. However, bonus depreciation is being phased out on a schedule:
| Placed-in-Service Period | Bonus Depreciation % |
|---|---|
| 2017 – 2022 | 100% |
| 2023 | 80% |
| 2024 | 60% |
| 2025 | 40% |
| 2026 | 20% |
| 2027 and beyond | 0% |
Section 179 is a separate provision targeted at small businesses. It allows immediate expensing of asset purchases up to an annual limit (currently $1,000,000 of property placed in service per year). Unlike bonus depreciation, Section 179 has spending caps and is designed specifically to help smaller firms invest in equipment without complex depreciation schedules.
Projects don't just need equipment — they need cash to operate. A new product line requires inventory, generates accounts receivable, and creates accounts payable. The net of these items is the project's net working capital (NWC) investment.
It's the change in NWC that affects cash flow, not the absolute level. When a project requires an increase in NWC (more inventory, more receivables), that's a cash outflow. When NWC is reduced, cash is freed up — an inflow.
When a firm replaces an old machine with a new one, the cash flow analysis becomes more complex. You need to account for:
At the end of the project, any asset sale has tax consequences. If you sell an asset for more than its depreciated book value, the IRS taxes the gain. If you sell it for less, you recognize a deductible loss. This tax effect must be included in the terminal cash flow.
Some projects don't generate new revenue — they reduce existing costs. An energy-efficient HVAC system, for example, doesn't bring in new customers, but it lowers the monthly utility bill. The analysis is the same: estimate the incremental cash savings, subtract the initial investment, account for depreciation and taxes, and discount at the WACC.
Sometimes you must choose between two assets that do the same job but have different lifespans. Machine A lasts 3 years and costs $60,000. Machine B lasts 5 years and costs $80,000. Which is cheaper? You can't compare total costs directly because the timeframes differ.
The Equivalent Annual Cost (EAC) approach converts each asset's total present value of costs into an annuity payment — a constant annual cost that would have the same present value. This lets you compare projects with different lives on an apples-to-apples basis.
The logic extends to the idea that if you repeat each project indefinitely, the stream of repeated annuities becomes a perpetuity. The asset with the lower annual cost is the better long-term choice.
When a firm raises capital to fund a project, it incurs flotation costs — the fees paid to investment bankers, lawyers, and regulators to issue new securities. There are two ways to handle these costs, and one is clearly preferred.
First, compute the weighted-average flotation cost using the firm's target capital structure weights (debt and equity). Then adjust the initial investment:
Flotation-Adjusted Initial Investment = Project Cost ÷ (1 − fA)Where fA is the weighted-average flotation cost rate. If a project costs $100,000 and fA is 5%, the flotation-adjusted initial investment is $100,000 ÷ 0.95 = $105,263. The extra $5,263 represents the capital that must be raised to cover both the project and the flotation costs.
Explore these to deepen your understanding of this chapter's topics:
▶ YouTube Capital Budgeting — Incremental Cash Flows ▶ YouTube Making Capital Investment Decisions ▶ YouTube Estimating an Investment's Cash Flows 📖 Investopedia Incremental Cash Flow — What It Is and Why It Matters 📖 Investopedia Sunk Cost — Definition and Fallacy