Capital Expenditure
Executive Summary
Key Takeaways
- ✓ Capital expenditure is cash spent acquiring or upgrading fixed assets, recorded as an investing outflow on the cash flow statement and added to gross fixed assets on the balance sheet.
- ✓ Maintenance capex sustains the existing asset base; growth capex expands it — the distinction matters for assessing sustainable free cash flow and evaluating returns on new investment separately from upkeep.
- ✓ Capex flows into the depreciation schedule, which allocates its cost across the asset's useful life as a non-cash charge against the income statement.
- ✓ A capex figure that does not reconcile to the depreciation schedule's opening asset base plus additions is a common structural red flag in a financial model.
Definition¶
Capital expenditure (capex) is cash spent acquiring, upgrading, or extending the useful life of a fixed asset — property, plant, and equipment. Unlike an operating expense, which is charged in full to the income statement in the period it is incurred, capex is not expensed immediately; instead, its cost is capitalized on the balance sheet and allocated across the asset's useful economic life through the depreciation schedule.
Why It Matters¶
Capex is one of the largest cash outflows in many businesses' financial models, and it is the specific link connecting the cash flow statement's investing section to the balance sheet's fixed asset base and, through the depreciation charge it generates, to the income statement. Getting the capex-to-depreciation relationship right is a direct test of statement integration: a capex figure that grows the asset base without a corresponding depreciation schedule update, or a depreciation charge that does not reconcile to the actual capex history, is one of the more common ways a three-statement model's linkage silently breaks.
Technical Background¶
Maintenance vs. Growth Capex¶
Capex is commonly split into two categories:
- Maintenance capex. Spending required to sustain the existing asset base at its current productive capacity — replacing equipment as it reaches the end of its useful life, routine facility upgrades. This is treated as a recurring cost of remaining in business, analogous in character to an operating cost even though it is capitalized rather than expensed.
- Growth capex. Spending that expands the asset base beyond what is needed to sustain current operations — a new facility, a capacity expansion, a new product line's equipment. This is a discretionary investment decision, evaluated on its own expected return.
This distinction matters directly for free cash flow analysis: a business's sustainable free cash flow is better assessed after only maintenance capex, since growth capex is, in principle, discretionary and should generate incremental returns that justify it separately. It also matters for private equity and corporate development analysis, where returns on growth investment are frequently tracked apart from the ongoing cost of maintaining the existing business.
The Capex-to-PP&E-to-Depreciation Relationship¶
Opening Gross PP&E
+ Capital Expenditure (additions)
- Disposals
= Closing Gross PP&E
Opening Accumulated Depreciation
+ Depreciation Charge for the Period
- Accumulated Depreciation on Disposals
= Closing Accumulated Depreciation
Net Book Value = Closing Gross PP&E - Closing Accumulated Depreciation
Capex increases gross fixed assets in the period it is incurred; the resulting depreciation charge, calculated by the depreciation schedule, then reduces net book value gradually over the asset's useful life and simultaneously reduces operating profit on the income statement. A newly acquired asset typically does not begin depreciating until it is placed in service, which for large capital projects may be a period or more after the cash outflow itself.
Capex on the Cash Flow Statement¶
Capex is recorded as an outflow in the investing section of the cash flow statement, separate from the depreciation add-back in the operating section — the two should never be netted against each other, since they represent different things: capex is the current period's cash investment, while depreciation is the accounting allocation of past investment.
Forecasting Capex¶
Capex is forecast using one of several common approaches: as a percentage of revenue (simple, but disconnected from any specific investment plan), as a fixed schedule tied to a known project or expansion plan, or as the sum of maintenance capex (often estimated as a percentage of the existing gross asset base or equal to the depreciation charge, as a simplifying assumption) plus discretionary growth capex tied to specific planned investments. Whichever method is used, the resulting figure should flow directly into the depreciation schedule's opening asset base for the following period.
Common Errors¶
| Error | Description | Risk |
|---|---|---|
| Capex not linked to the depreciation schedule | Capex modelled as a standalone assumption disconnected from the fixed asset roll-forward | Depreciation charge and net book value diverge from the model's actual investment plan |
| Maintenance and growth capex not distinguished | All capex treated as a single undifferentiated line | Sustainable free cash flow and discretionary investment returns cannot be separately assessed |
| Depreciation charge starts before the asset is placed in service | Newly acquired asset depreciated from the period of cash outflow rather than from when it becomes operational | Income statement overstates the depreciation charge in the acquisition period |
| Capex and depreciation netted together on the cash flow statement | Capex outflow reduced by the depreciation add-back rather than shown as two separate lines | Investing and operating cash flow are both misstated |
| Disposals not reflected in the fixed asset roll-forward | Asset sold or retired but not removed from gross PP&E and accumulated depreciation | Net book value overstated relative to the actual remaining asset base |
Best Practices¶
Link the capex line directly to the depreciation schedule's fixed asset roll-forward rather than treating the two as independent assumptions. Where the forecast basis supports it, distinguish maintenance capex from growth capex explicitly, since the two carry materially different implications for free cash flow and returns analysis. Confirm the depreciation schedule's opening gross asset balance each period reconciles to the prior period's closing balance plus that period's capex, with disposals removed.
Continue Reading¶
Related Pillars¶
Related Glossary¶
Related Technical Guides¶
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Frequently Asked Questions
What is capital expenditure?
Cash spent acquiring, upgrading, or extending the useful life of a fixed asset — property, plant, and equipment. It is recorded as an outflow in the investing section of the cash flow statement and increases gross fixed assets on the balance sheet.
What is the difference between maintenance capex and growth capex?
Maintenance capex is spending required to sustain the existing asset base at its current productive capacity — replacing worn-out equipment, for example. Growth capex expands that capacity — building a new facility or acquiring new equipment beyond what is needed to sustain current operations.
Why does the maintenance versus growth capex distinction matter?
It matters for assessing sustainable free cash flow (maintenance capex is a recurring cost of staying in business; growth capex is a discretionary investment decision) and for evaluating the returns generated specifically by new investment, separate from the cost of simply maintaining existing operations.
How does capex connect to the depreciation schedule?
Capex additions increase the depreciation schedule's gross asset base, and the depreciation schedule then allocates that cost as a periodic charge across the asset's useful life, reducing both net book value on the balance sheet and operating profit on the income statement.
Is capex the same as depreciation?
No. Capex is the cash outflow when an asset is acquired; depreciation is the non-cash accounting allocation of that cost across the asset's useful life in subsequent periods. The two are related but distinct — capex is a cash flow event, depreciation is an accrual accounting charge.
What is a common structural error in how capex is modelled?
A capex line entered as a standalone assumption (for example, a flat percentage of revenue) with no link to the depreciation schedule's actual fixed asset roll-forward, causing the two figures to silently diverge from each other over the forecast period.
Where does capex appear across the three financial statements?
As an investing outflow on the cash flow statement, as an addition to gross fixed assets on the balance sheet, and indirectly on the income statement through the depreciation charge it generates in future periods — described in full on the Statement Linking Mechanics technical guide.
Related Articles
Financial Statements in Financial Modelling
The income statement, balance sheet, and cash flow statement are the three financial statements that together describe a company's or project's performance, financial position, and cash movements. In a financial model, these are not three independent outputs — they are dynamically linked, so that a single change in an assumption flows correctly through all three, and the balance sheet balances in every period as a direct consequence of that linkage rather than as a plug engineered to force it. This page is the hub for the Knowledge Centre's financial statements content: what each statement represents, how a three-statement model integrates them, where financial-statement mechanics anchor broader industry models, and how a structural audit tests statement integration for the errors that most commonly break it.
Depreciation Schedule
A depreciation schedule in a financial model is a systematic calculation of the periodic reduction in the carrying value of a fixed asset over its useful economic life. The depreciation charge is expensed through the income statement each period, reducing EBITDA to operating profit (EBIT) and creating a non-cash charge that reduces taxable income. Two principal methods are used in financial models: straight-line depreciation (equal charge in each period) and reducing balance (declining charge in each period). The depreciation schedule feeds into three key statements: the income statement (depreciation charge), the balance sheet (net book value of assets), and the cash flow statement (depreciation added back as a non-cash item).
Balance Sheet
The balance sheet is a snapshot of a company's or project's financial position at a single point in time, structured around the accounting identity Assets equal Liabilities plus Equity. In a financial model, one line — typically cash or a revolving credit facility — is designated the balancing mechanic, absorbing the residual funding surplus or shortfall the rest of the model produces so the identity holds exactly in every period. A balance sheet that fails to balance is the single most diagnostic signal that a model's statement linkage contains a structural error.
Cash Flow Statement
The cash flow statement reconciles the income statement's accrual-based net income to the actual cash generated or consumed over the same period, split into operating, investing, and financing activities. Its output, the net change in cash, added to the opening cash balance, must equal the closing cash balance — which must, in turn, equal the cash line on the balance sheet. In a financial model, this tie-out is one of the clearest mechanical tests of whether the three statements are correctly linked.
Statement Linking Mechanics
Statement linking mechanics are the specific formulas and connections that turn three independently understandable statements into one integrated three-statement model. This guide walks through each linkage step by step: net income flowing to retained earnings and to the top of the cash flow statement, the sign conventions that govern working-capital adjustments, capex and debt movements connecting the statements, and the final ending-cash-to-balance-sheet tie-out that confirms the whole structure holds together. It closes with the specific linking errors most responsible for an out-of-balance model.