There's one question that tech startup founders ask themselves—or should ask themselves—before every major outlay: is this CAPEX or OPEX? The answer is not an accounting technicality. Determine your runway, your investor risk profile and, in many cases, if your company reaches the next round.

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What are CAPEX and OPEX? Definition for tech startups

CAPEX: Capital Expenditure

CAPEX (Capital Expenditure) are investments in assets that will generate value for more than one year. In accounting, they are not recorded as an immediate expense: they are activated on the balance sheet and are progressively amortized over their useful life.

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Examples of CAPEX in a tech startup:

• Purchase of servers or own hardware
• Development of capitalizable software under IFRS/IAS 38 (construction phase)
• Acquiring perpetual software licenses
• Valuable office equipment

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OPEX: Operating Expenses

OPEX (Operating Expenditure) are the recurring costs necessary for the business to operate on a daily basis. They are fully recognized as an expense in the period in which they are incurred.

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Examples of OPEX in a tech startup:

• Team salaries and payroll (including developers in the R&D phase)
• Cloud infrastructure: AWS, Azure, GCP on a pay-per-use model
• SaaS subscriptions: Salesforce, HubSpot, Slack, Notion...
• Third-party API costs: OpenAI, Anthropic, Stripe
• Office rental

“The cloud turned infrastructure CAPEX into OPEX. That 2006 decision (the launch of AWS) democratized the creation of startups and doubled the number of VC investments in software in four years.” — Ewens, Nanda & Rhodes-Kropf, Journal of Financial Economics (2018)

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Differences between CAPEX and OPEX in Tech Startups: comparison table

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How to calculate CAPEX and OPEX in your startup

Basic CAPEX formula

CAPEX = Purchase price + Installation costs + Improvements that extend the useful life of the asset

Basic OPEX formula

OPEX = Payroll + Cloud Infrastructure + Subscriptions + Rent + Marketing + Other Recurring Costs

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For early-stage startups, monthly OPEX is your Burn Rate. Dividing your box by the burn rate gives you the Runway in months — the most critical survival metric before Series A.

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Rule of thumb: if your startup is pre-PMF, almost everything should be OPEX. Before finding the product-market, CAPEX immobilizes capital in assets that you may not need. 29% of startups fail because they run out of cash.

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The critical gray area: when is software development CAPEX?

This is the question that generates the most confusion - and where the valuation of a startup is most at stake. The short answer: a developer's salary is OPEX when they research; they become CAPEX when they build a technically viable and marketable asset.

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IFRS/IAS 38 establishes six criteria that MUST ALL be met in order to capitalize. In practice, the change from exploratory R&D (OPEX) to the construction phase (capitalizable CapEx) occurs at a very specific technical milestone.

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✅ Software capitalization checklist according to IAS 38/ASC 350-40

The 6 PIRATE criteria — all mandatory:

• ☐ Demonstrated technical feasibility (proof of concept completed, architecture defined)
• ☐ Intent to complete the asset and put it into use or sell it
• ☐ Ability to use or sell the asset once completed
• ☐ Probable generation of future economic benefits (potential customers identified)
• ☐ Technical, financial and human resources available to complete it
• ☐ Ability to reliably measure costs during development

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Practical line of switching from OPEX to CapEx: the milestone is when the team goes from “exploring if it's possible” to “building what we already know works”. Documenting this milestone—sprint, approved architecture, closed technical backlog—is essential for auditing.

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⚠️ Warning: capitalizing to inflate EBITDA is a mistake. The VCs undo it in due diligence. An aggressive capitalization policy erodes trust, not value.

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The real impact of CAPEX and OPEX on your startup's funding

The cost structure is not neutral for investors. It affects three critical dimensions:

1. Burn rate and runway

A poorly planned CAPEX destroys runway. If you invest €150,000 on own servers When could you pay €8,000/month in cloud, you just consumed 19 months of that expense in a single disbursement —without having found a product-market.

2. Gross margin and valuation multiples

SaaS companies with an efficient OpEx model are trading at averages of 3.0x EV/Revenue compared to 1.4x for hardware companies (Aventis Advisors, 2025). The reason: gross margins of 70-85% in SaaS versus 25-40% in hardware. Each gross margin point directly impacts the valuation multiple

3. CAPEX, dilution and cap table: the link that no one explains

Here's the most overlooked impact: Every euro of CapEx that you can't finance with income or debt, you finance with equity — and that dilutes the founders.

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💡 CapEx vs OpEx dilution example

Scenario A — Intensive CapEx: You buy €500K worth of GPU servers before you earn income. You need to raise an additional round of €800K to cover that investment + runway. At a pre-money valuation of €3M, you give up an additional 21% of the company.

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Scenario B — OpEx cloud: you use Azure at €12,000/month. With €144K a year, you grow the product, reach €30K MRR, and raise the round to €6M pre-money. You give up 12% for the same capital — saving 9% on dilution.

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The rule: Delay CapEx until you can finance it with FCF or venture debt. Every €1 of CapEx advanced at an early stage is worth twice as much in future dilution.

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4. Capital efficiency and investor metrics

VCs evaluate your cost structure using three metrics. El Burn Multiple (Net Burn ÷ Net New ARR): <1.5x excellent, >3x worrying. La Rule of 40 (growth + EBITDA margin ≥ 40%): companies that exceed it have valuations twice as high (Bain & Company). And the BVP Efficiency Score (Net New ARR ÷ Net Burn): >1.5x for startups <$30M ARR is excellent.

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The cloud revolution: from CAPEX to OPEX as a competitive advantage

Before AWS (2006), launching a tech startup required buying servers —pure CapEx— before knowing if the product would work. AWS transformed that barrier into a variable expense that grows only as the business grows. The impact: VC investment in software The number of funded startups doubled from 375 to 700/year between 2006 and 2010 (Ewens, Nanda & Rhodes-Kropf, JFE 2018).

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Today, Gartner estimates that 51% of enterprise IT spending is heading to public cloud, with global spending of $723.4 billion in 2025. The cloud is no longer an option — it's the default architecture.

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Success stories: How do giants like Netflix or Dropbox manage CapEx?

Netflix: the OPEX cloud that enabled 300 million subscribers

Netflix migrated to AWS in 2008 after a failure in its only data center. He completed the transition in 2016. Cost savings weren't the main reason: it was the resilience and the speed of global expansion without building data centers country by country. It grew from 8 million to 300+ million subscribers. Your smartest decision: hybrid model — AWS for the backend, Netflix Open Connect (own CDN) for video delivery, thus optimizing the most expensive operation.

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Dropbox: the CAPEX that brought gross margin from 33% to 82%

In 2015, with 500+ million users, Dropbox built “Magic Pocket”, its proprietary storage system. Outcome: $39.5 million in net savings in the first year, gross margin of 33% to 67% in two years and 82.5% in 2024. The lesson: CapEx in own infrastructure makes sense on a massive and predictable scale. Before that threshold — AWS was the right decision.

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Stability AI: the OpEx that destroyed a company

Stability AI (UK) spent ~$99M/year in cloud against ~$11M of revenue in 2023 — 9:1 ratio. Its CEO resigned in March 2024. The opposite case: Midjourney reduced its monthly spending from $2.1M to $700K by migrating to Google TPU. Scaling capacity without scaling revenues is lethal.

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The hidden CapEx of AI: GPUs, Inference, and the Scaling Trap

An H100 GPU costs $25,000-$40,000. A DGX H100 system is over $300,000. CapEx on GPU hardware loses 40-60% of its value in 18-24 months. But the real trap is not in training, but in inference — 80-90% of the total lifecycle cost. And it scales linearly with use.

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a16z documented the paradox: the cost of inference falls 10x each year, but reasoning models consume 50x more tokens. More kilometers per gallon, but 50x more gallons.

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PaFor your AI startup: a PoC that costs €1,500/month can scale to more than €1M/year in production. Plan the cost architecture before scaling the go-to-market.

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When to do CAPEX and when to keep everything in OPEX? Framework by stage

Practical Assessment Threshold: When You Exceed $50,000/month of cloud spending with predictable workloads. Underneath, the flexibility of OpEx is worth more than the potential savings.

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How to finance CapEx without diluting founders: Venture Debt and alternatives

One of the most important — and least understood — decisions in a startup's financial architecture is How to finance the inevitable CapEx without delivering more equity. There are three main tools:

1. Venture Debt

Venture debt is structured debt—usually 24-36 months—backed by the company's VC history and assets. It doesn't dilute the founders, and usually includes warrants of very low value (1-3% of nominal value). It is ideal for financing tech infrastructure with a lifespan of >18 months.

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Providers in Europe: Silicon Valley Bank (HSBC Innovation Banking), Kreos Capital, TriplePoint Capital, Fasanara Capital. Typical ticket: €500K—€10M. Cost: 8-12% per annum + warrants.

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When to use it: when you have at least 12 months of runway with raised equity, recurring revenues >€200K MRR, and a specific and justifiable CapEx (servers, manufacturing hardware, AI infrastructure).

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2. Operating Leasing vs. Financial Leasing

Operating leasing converts one-off CapEx into monthly installments —OPEX— without the need to activate the asset on the balance sheet. For servers, GPUs or manufacturing equipment, it may be the most efficient tool if the vendor assumes technological obsolescence.

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Rule: if the asset can become obsolete before the end of the contract, operating leasing transfers that risk to the lessor.

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3. Non-dilutive public grants (Spain/Europe)

For Spanish startups, the CDTI (Center for Technological and Industrial Development) offers participatory loans for R&D projects at 0% or very low interest rates, which can finance part of CapEx for technological development. Los NEOTEC loans (€250K—€325K) are specifically designed for early-stage tech startups. La EU Horizon Europe it also funds research infrastructure.

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💡 Patricio Hunt's rule on CapEx and dilution. Before raising equity to finance CapEx, exhaust in this order: (1) non-dilutive grants (ENISA, CDTI, NEOTEC), (2) venture debt if you have >€200K MRR, (3) operating leasing if the asset may become obsolete, (4) sale-leaseback if you already have your own assets. Equity is the most expensive type of financing available. Use it to grow, not to buy hardware.

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Tax implications of CAPEX and OPEX that you can't ignore

OPEX: immediate deduction. 100% of the expense is deducted for the year incurred. For startups with limited cash, maximize tax savings when you need them most.

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CAPEX: deferred deduction. It pays for itself in 3-7 years. You don't see the tax benefit until years after the disbursement.

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Software development (gray area): under IFRS/IAS 38, capitalization is mandatory if all six criteria are met. Sophisticated investors revert it to due diligence if they detect aggressive capitalization.

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Strategies to optimize the CAPEX/OPEX structure of your startup

For early-stage startups (Pre-series A)

• Maximize OpEx: cloud, APIs, SaaS. Preserve box for product and equipment.
• Avoid CapEx before PMF. Fixed assets don't adapt to the pivot.
• Monitor burn rate on a monthly basis. Runway of 24-36 months is the survival metric.
• It finances inevitable CapEx with public grants (ENISA, CDTI, Horizon Europe).

For startups in the growth phase (Series A-B)

• Enter Burn Multiple (<1.5x excellent, >3x worrisome) as an internal metric.
• Evaluate if any CapEx creates real defensible moat.
• Implement FinOps: 30% of global cloud spending is avoidable waste.
• Evaluate venture debt for CapEx >€300K if you have recurring MRR. Don't use equity for hardware.

For startups in the scaling phase (Series B+)

• Evaluate the repatriation of stable cloud loads when you exceed $50K/month. Dropbox saved $75M over two years.
• Capitalize on software development when it is defensible to auditors. Not to inflate EBITDA.
• Rule of 40 applies. Companies that exceed it are rated twice as high as those that don't.

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Frequently asked questions about CAPEX and OPEX in startups

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Can a startup capitalize on the salary of its developers?

Yes, but only partially and under strict conditions. Developer salaries are OPEX by default. They only become capitalizable CapEx when the team has passed the exploratory R&D phase and is building a technically viable and marketable asset (IAS 38, PIRATE criteria). The key is to document the technical phase-change milestone: approved architecture, closed construction backlog, demonstrated viability. Without that document, an auditor will reject capitalization.

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How is CAPEX different from OPEX in software vs. hardware companies?

In companies of pure software (SaaS), almost the entire operation is OPEX: cloud, APIs, development salaries in the R&D phase. CapEx is marginal (own servers at scale, IPs purchased). In companies of hardware, CapEx dominates: manufacturing molds, production equipment, inventory. This difference explains why SaaS companies are trading at 3x EV/Revenue and hardware at 1.4x: the OpEx model allows gross margins of 70-85% impossible on hardware (25-40%).

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How does the decision of CAPEX vs. OPEX to an investment round?

In three direct ways. First, Burn Rate and Runway: a poorly planned CapEx reduces runway and can make you arrive at the round with fewer cash months, weakening your negotiating position. Second, Gross margin: Intensive CapEx depress gross margin, which is the key metric for SaaS valuation. Third, thinning: if you need equity to finance CapEx, every euro of hardware you buy ahead of time costs you twice as much in future dilution.

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What tools can a startup use to finance CapEx without being diluted?

In order of increasing cost-dilution: (1) non-dilutive grants: ENISA, CDTI, NEOTEC, Horizon Europe; (2) Venture Debt: 24-36 month loans from SVB, Kreos, TriplePoint with minimum warrants; (3) operating leasing: monthly fees that convert CapEx to OpEx without activating assets on the balance sheet; (4) Sale-Leaseback: selling existing assets and renting them back (useful for GPUs and AI infrastructure). Equity should be the last resort for financing fixed assets.

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When should a startup migrate from cloud (OPEX) to its own infrastructure (CapEx)?

When four conditions are met simultaneously: (1) cloud spending greater than $50,000/month; (2) workloads stable and predictable (not experimental); (3) technical equipment capable of operating its own infrastructure; (4) measurable growth projection at 18-24 months. Dropbox expected 500 million users. 37signals (Basecamp) left AWS with ~$1.5M in annual savings. A premature decision is the most common mistake.