Growth capex is the portion of capital spending aimed at expanding capacity, entering new markets, or building capabilities the business didn’t previously have. Maintenance capex is the spending required to keep existing operations running at their current level. The comparison between growth capex and maintenance capex matters because true free cash flow, and any honest valuation built on it, depends on subtracting only the maintenance portion. Treating the two as one number either flatters a stagnant business or punishes a growing one.
What Each Bucket Actually Covers
Maintenance capex is non-discretionary. If a manufacturing plant’s conveyor belt wears out, the company replaces it to keep the line moving. If a delivery company retires a ten-year-old van and buys an identical replacement for the same route, that spending is maintenance. These expenditures preserve what the business already has without adding anything new.
Growth capex is discretionary. A manufacturer spending $50 million to build a new production wing that lifts output by 30% is making a growth investment. A logistics company buying ten trucks to service a newly won national contract is doing the same. So is a retailer opening stores in a region where it had no presence, or a tech company adding data center capacity to support a new product line.
The distinction matters because a company reporting strong net income while quietly underinvesting in maintenance is borrowing from its own future. Assets degrade, and eventually the business faces a catch-up bill that wipes out years of apparent profits. A company spending heavily on growth may look like it’s burning cash when it’s really building an engine for future earnings. One number for capex hides both problems.
Why the Line Blurs
The clean two-bucket framework breaks down constantly in the real world. The most common headache is replacement with improvement. When a company retires an old machine and installs a newer model, the replacement almost always has better specs, lower energy consumption, or higher throughput. Is the full cost maintenance, or is the incremental improvement growth?
Accounting standards give partial guidance. Under U.S. GAAP, costs that extend an asset’s life or increase its functionality can be capitalized, while routine repairs and maintenance are expensed as incurred. International standards under IAS 16 draw a similar line: day-to-day servicing is expensed immediately, but replacement of major components gets capitalized when the recognition criteria are met.1IFRS Foundation. IAS 16 Property, Plant and Equipment But the standards only tell you what lands on the balance sheet. They don’t tell you what portion of that capitalized amount is growth versus maintenance. That split is left to the analyst.
Technological obsolescence adds another wrinkle. An automaker spending billions to retool plants for electric vehicles is technically maintaining competitive viability, not expanding into a new business, but the magnitude of the spend looks nothing like routine maintenance. These are judgment calls where knowledge of the underlying business matters more than the formula.
Three Methods for Estimating the Split
Since companies rarely hand you a clean breakdown, you estimate it. Three approaches dominate.
The Depreciation Proxy
The most widely used method treats depreciation and amortization as a stand-in for maintenance capex. The logic: D&A approximates the annual cost of wear and tear on existing assets, so subtracting it from total capex leaves the growth portion. The formula is Total Capex minus D&A equals Growth Capex.
The problem is that depreciation is calculated on the historical purchase price of assets bought years ago. Replacing those same assets today almost always costs more. Research from Morgan Stanley’s investment management division found that in aggregate, maintenance capex exceeds depreciation by roughly 20%, with substantial variance across industries. The depreciation proxy therefore tends to overstate growth capex by understating the real cost of keeping the business running. If you use it, adjust the D&A figure upward for inflation, and be especially skeptical for companies with old asset bases in industries facing high input cost inflation.
The Historical Baseline
A second approach looks at what the company spent during periods of flat or zero revenue growth. During years when the business wasn’t expanding, essentially all capex was maintenance. That level becomes your baseline, and anything above it in growth years counts as growth capex.
Period selection makes or breaks this method. A year where spending was low because management deferred necessary maintenance gives you a falsely low baseline. Look for operational stability, not neglect. Recessions can work as reference points, but only if the company didn’t slash necessary spending to protect short-term earnings. Cross-check with asset condition metrics and efficiency ratios to confirm the business was actually being maintained.
The Revenue Correlation
The third technique uses regression to isolate how capex relates to revenue changes over a long time series. Plot total capex against revenue growth across a decade or more. The portion of spending that moves with revenue represents growth capex. The residual amount the company spends regardless of whether revenue is rising or flat approximates maintenance.
This approach has statistical rigor the other two lack, but it demands a long time series and assumes the relationship between capex and revenue growth is reasonably stable. Companies undergoing strategic shifts, entering new industries, or making large acquisitions will throw off the regression. It works best for mature businesses with consistent operating models.
Why the Split Matters for Valuation
The standard free cash flow formula subtracts total capex from operating cash flow. That formula penalizes companies for investing in growth, making an aggressively expanding business look worse than a stagnant one generating the same operating cash flow. For valuation, many analysts calculate an adjusted FCF that subtracts only maintenance capex, revealing the cash the business generates after keeping its existing asset base intact.
Warren Buffett popularized a version of this idea as “owner earnings” in his 1986 letter to Berkshire Hathaway shareholders. His formula: net income plus depreciation and amortization, minus maintenance capex, minus working capital increases. The result represents the cash that could theoretically be pulled from the business each year without impairing its competitive position. The whole framework hinges on a credible maintenance capex estimate, which is why the three methods above carry so much weight.
High growth capex can justify a higher valuation multiple, but only if the spending earns returns above the company’s cost of capital. When return on invested capital exceeds the weighted average cost of capital, each dollar of growth capex creates more than a dollar of enterprise value. When ROIC falls below WACC, the opposite happens: the company is pouring money into projects that generate less than investors could earn elsewhere, and growth actively destroys shareholder value.2Financial-Economics.nl. When Growth Destroys Value: Capital Intensity, ROIC, and the Cost of Capital Volume of growth spending matters far less than its efficiency.
Industry Context Changes What Looks Normal
Capex intensity varies enormously by industry, and that context is essential when judging whether a growth capex figure is reasonable. As of early 2026, net capital expenditures as a percentage of sales range from under 2% for aerospace and defense companies to over 40% for water utilities. General utilities run around 34%, power companies around 24%, and internet software companies around 26%. Traditional manufacturing sectors like auto and truck, chemicals, and machinery cluster between 2% and 5%. General retail sits near 5%.
A 10% capex-to-revenue ratio would be alarming for a machinery company and unremarkable for a utility. The growth portion tends to be larger as a share of total capex in faster-growing industries and smaller in mature, heavily regulated sectors where most spending goes to maintaining aging infrastructure. Always compare within the same industry.
Capital-light industries like software or professional services may show minimal capex altogether. Their growth investments flow through the income statement as research and development or sales and marketing expense. The growth-versus-maintenance framework still applies conceptually, but for these businesses you look at operating expenses rather than capex to find the growth spending.
Where to Find the Underlying Data
Total capital expenditure appears in the statement of cash flows under investing activities, usually as “purchases of property, plant, and equipment” or “capital expenditures.” Depreciation and amortization show up on the income statement and in the operating activities section of the cash flow statement, where they’re added back to net income as a non-cash charge.
For context, read the Management Discussion and Analysis section of the 10-K. SEC rules require public companies to describe their material cash requirements, including capital expenditure commitments, the anticipated source of funds, and the general purpose of those requirements.3eCFR. 17 CFR 229.303 – (Item 303) Management’s Discussion and Analysis Some companies voluntarily break out growth and maintenance in their MD&A or earnings calls. Take those disclosures seriously but verify the logic, because management has an incentive to label more spending as “growth” since that implies future returns rather than upkeep. Reading several years of annual reports, investor presentations, and earnings call transcripts will tell you whether the capex narrative is consistent.