IB CapEx Analysis (Technical Interview Prep)

Capital expenditures, or CapEx, are cash investments in long-term assets. In an investment-banking interview, you should explain how CapEx affects cash, PP&E, depreciation, and free cash flow, then build a forecast tied to a clear business driver. The strongest answer states its assumptions, separates maintenance from growth spending when possible, and explains what the available data cannot show.

You know CapEx is important, but can you explain what happens after a company spends $100 million on equipment? Interviewers want more than a definition. They may ask you to walk through all three statements, build a PP&E schedule, or explain how a CapEx forecast changes valuation.

I often see candidates memorize a formula but miss the assumptions behind it. A better approach is to learn the accounting first, then show how you would forecast and test it. The examples below give you a practical route.

Interview scope and prerequisites

Investment-banking CapEx questions test whether you can connect accounting to cash flow and valuation. You do not need an academic program or a single “correct” forecast formula. You do need to explain the transaction, state your assumptions, and keep the income statement, balance sheet, and cash flow statement consistent.

Before you start, review how the statements link, how taxes work, and how free cash flow is defined. You should also know the difference between an asset purchase and a routine operating cost. These basics let you answer follow-up questions instead of relying on a memorized script.

What counts as CapEx?

CapEx is cash spent to acquire, improve, or extend the useful life of a long-term asset. Examples can include machinery, buildings, or certain software costs, depending on the facts and accounting policy. Routine repairs that keep an asset in its current condition are usually operating expenses, not CapEx.

The distinction matters because capitalized spending is recorded as an asset and expensed over time through depreciation or amortization. A routine expense usually reduces current-period operating income. In practice, company policies and the nature of the cost matter; do not classify a cost by its label alone.

Interview check: Explain why a major equipment purchase may be capitalized, while ordinary servicing may be expensed. Then note that classification depends on the cost and the company’s accounting policy.

Build a PP&E schedule and link the statements

A PP&E schedule tracks the cost of property, plant, and equipment over time. It connects CapEx to the balance sheet and depreciation to the income statement. Use a roll-forward, then adjust it for items such as disposals, acquisitions, impairments, and other disclosed movements when relevant.

The basic roll-forward is:

Ending PP&E = Beginning PP&E + CapEx − Depreciation − Disposals or write-offs

This simplified formula assumes there are no other movements. A public company’s filing may show additional changes, so reconcile your model to the company’s disclosures where possible. Also check whether the reported figures are gross PP&E or net PP&E a schedule must use consistent measures.

How does CapEx affect all three statements?

When a company buys a long-term asset with cash, CapEx appears as an investing cash outflow. PP&E rises on the balance sheet. The purchase does not usually create an immediate income-statement expense; depreciation reduces the asset’s carrying value and earnings over time.

Consider a simplified $100 CapEx purchase with no debt or other financing. In the purchase period, cash falls by $100 and PP&E rises by $100. There is no immediate change to operating income from the purchase itself. The cash flow statement shows a $100 use of cash in investing activities.

Now assume straight-line depreciation over five years, no salvage value, and a 25% tax rate. Annual depreciation is $20. Compared with a case with no depreciation, pretax income falls by $20, taxes fall by $5, and net income falls by $15. Under the indirect cash flow method, depreciation is added back to net income; the $5 tax saving means cash from operations is $5 higher than it would otherwise be, assuming the tax treatment follows the stated assumption.

This is a simplified example. Actual cash taxes may differ from book taxes, and a company may use different depreciation methods for financial reporting and tax reporting. State those limits if the interviewer changes the assumptions.

Forecast CapEx and distinguish investment needs

A CapEx forecast estimates future spending based on a business driver. The driver may be revenue, production capacity, management guidance, or a project plan. There is no universal CapEx-to-revenue ratio that works for every company; industry, asset intensity, growth stage, and company plans all affect the choice.

Start with historical CapEx and the company’s stated outlook. Then select a driver that fits the business and explain why. A revenue-based forecast may be a useful starting point for a stable business, but capacity or project timing may be more useful for a company adding major facilities. Do not present a ratio as a rule if the company’s operations do not support it.

Use a consistent forecast sequence

A practical model follows these steps:

• Review historical CapEx, depreciation, and PP&E in the company’s filings.
• Identify management guidance and any disclosed projects or capacity plans.
• Choose a driver, such as revenue growth or added capacity, and state the assumption.
• Forecast CapEx for each period, then roll it into PP&E.
• Forecast depreciation using the asset base, expected lives, or a clear simplifying method.
• Test how different CapEx and depreciation assumptions affect cash flow and valuation.

Keep CapEx and depreciation separate. CapEx is spending on assets; depreciation is an accounting expense that spreads an asset’s cost over time. They may differ sharply in a given year, especially when a company is expanding, replacing old assets, or completing a large project.

Maintenance and growth CapEx

Maintenance CapEx supports existing operations or replaces assets as they wear out. Growth CapEx is intended to expand capacity or support new activity. This split can help you assess reinvestment needs and free cash flow, but companies may not report it consistently.

Do not assume all reported CapEx is growth spending. That can make free cash flow look too high if the forecast ignores the spending needed to sustain current operations. If the company does not disclose the split, say so. You can describe a reasoned estimate, but label it as an assumption rather than a reported fact.

A common unlevered free cash flow formula is:

UFCF = EBIT × (1 − tax rate) + D&A − CapEx − change in net working capital

Use the definition requested by the interviewer, since some models begin with net income or cash from operations. In each case, be clear about where CapEx is deducted and avoid counting it twice.

Worked interview cases: explain the logic, not just the number

These examples are simplified interview drills, not claims about a specific company. Their purpose is to show how to apply the accounting and forecasting steps. In a live case, use the company’s filings and guidance, and flag information you do not have.

Case 1: A company spends $50 million on equipment. Assume the full amount qualifies as CapEx and is paid in cash. PP&E rises by $50 million, cash falls by $50 million, and investing cash flow falls by $50 million. There is no immediate income-statement effect from the purchase itself.

Case 2: The asset is depreciated over five years. With straight-line depreciation and no salvage value, annual depreciation is $10 million. Each year, pretax income falls by $10 million. At a 25% tax rate, net income falls by $7.5 million versus a case with no depreciation, while the cash-tax effect is $2.5 million under the simplified assumption.

Case 3: Revenue is forecast to grow. Do not automatically apply last year’s CapEx-to-revenue ratio. Check whether the company has enough capacity, whether management expects new investment, and whether spending is tied to specific projects. If guidance is unavailable, present a base case and a sensitivity rather than false precision.

A useful sensitivity shows how higher CapEx affects free cash flow. If forecast CapEx rises by $10 million and other assumptions stay fixed, unlevered free cash flow falls by $10 million in that period. The long-term value effect depends on what the investment earns and when those returns arrive; spending alone does not prove value creation.

Practice for a clear technical answer

Interview readiness means explaining the steps aloud and handling changed assumptions. Start with the transaction, trace the three statements, and then discuss the forecast. Practice with round numbers so you can focus on the logic rather than arithmetic.

Use this checklist:

• Define CapEx and contrast it with routine maintenance expense.
• State whether the asset is paid for with cash or financing.
• Explain the purchase-period effects on the income statement, balance sheet, and cash flow statement.
• Explain later depreciation and its tax effect.
• Build the PP&E roll-forward and identify any omitted movements.
• Name the CapEx forecasting driver and why it fits.
• Separate maintenance and growth spending only when evidence supports it.
• State how CapEx changes free cash flow and what the forecast does not capture.

For case work, use company filings and earnings materials to compare historical spending, guidance, depreciation, and major projects. Check the wording and units before using figures. If a company does not disclose maintenance CapEx, do not present your estimate as a verified fact.

Conclusion: what a strong answer shows

A strong CapEx answer links the cash investment to PP&E, later depreciation, taxes, and free cash flow. It also shows that you can make a forecast without treating one ratio as universal. Practice the mechanics, use evidence where available, and state your assumptions and limits clearly.

FAQ

What is CapEx in investment banking?

CapEx is cash spent to acquire, improve, or extend the useful life of long-term assets. It is generally recorded as an investing cash outflow and added to PP&E.

What happens when CapEx increases by $100?

If paid in cash and capitalized, cash falls by $100 and PP&E rises by $100. The purchase itself usually has no immediate income-statement effect, though later depreciation affects earnings.

Does CapEx reduce net income immediately?

Usually, no. Capitalized CapEx is recorded as an asset, then expensed over time through depreciation or amortization. Routine costs that do not qualify for capitalization may reduce income when incurred.

How do you calculate ending PP&E?

Use beginning PP&E plus CapEx, less depreciation and disposals or write-offs. Add other disclosed movements, such as acquisitions or impairments, when they apply.

Is CapEx the same as depreciation?

No. CapEx is spending on long-term assets. Depreciation allocates the cost of certain tangible assets over time. The two amounts can differ in any period.

How do you forecast CapEx?

Use a driver that fits the company, such as revenue, capacity, project plans, or management guidance. State the assumption and avoid treating any CapEx-to-revenue ratio as universal.

What is maintenance CapEx?

Maintenance CapEx is spending meant to sustain current operations or replace worn assets. Companies do not always report it separately, so disclose when a split is an estimate.

How does CapEx affect free cash flow?

CapEx is subtracted in common free cash flow formulas. Higher CapEx lowers current-period free cash flow, while the investment’s future returns depend on the business results it supports.

Why add depreciation back to cash flow from operations?

Under the indirect method, depreciation reduces net income but does not use cash in that period. It is added back to reconcile net income to operating cash flow.

What should I say if CapEx guidance is unavailable?

Use historical spending and relevant operating data to form a stated assumption. Explain the limits, and consider showing a sensitivity rather than presenting one uncertain forecast as fact.

(This article was written by one of our staff writers, James Holloway. Visit our Meet the Team page.)