CapEx vs OpEx: how the cloud changes the way you pay

One of the first ideas AZ-900 tests, and one of the easiest points to bank. Six questions on capital versus operational spending, worded the Azure way, 2026 edition.

Try 6 free CapEx-versus-OpEx questions in the exam's own style — every answer explained, no sign-up — and lock in an easy Cloud Concepts point.

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The verdict first: CapEx is buying and owning something up front, OpEx is paying for what you use as you go — and moving to Microsoft Azure shifts you from the first to the second. If you remember only that sentence, you will still bank most of the marks this topic offers. The rest of this page is about the edges the exam likes to test, and none of them are hard once you have the picture.

If this is your first certification, take a breath — this is one of the friendliest concepts in the whole Cloud Concepts area. There is no architecture to design and no service to configure. It is a vocabulary point, and vocabulary points are exactly the kind of easy marks AZ-900 hands out to prepared beginners.

The two spending models

Capital expense (CapEx) is a large, upfront purchase of an asset your company owns and then depreciates over its useful life. Buying a rack of physical servers or building your own datacentre is CapEx: you commit a big sum once, and the hardware sits on your books as an asset for years.

Operational expense (OpEx) is ongoing spend for something you consume rather than own. Azure pay-as-you-go is the clean example — you are billed each month for the virtual machines, storage, and bandwidth you actually used, and you own none of it. The bill scales up and down with your usage.

The diagram above draws the contrast: CapEx as one big upfront block you own and depreciate, OpEx as many small pay-as-you-go increments spread along a timeline, with the arrow showing the direction the cloud moves you — CapEx to OpEx.

The nuance the exam tests

Three details separate the confident answer from the guess:

Reservations and savings plans are still OpEx. Committing to a one-year or three-year term on Azure earns a discount, but you own no hardware and hold no depreciating asset. It is committed operational spending, not a return to CapEx. The exam loves this trap.
The Pricing Calculator estimates future OpEx. Use it to price a workload you are planning — assemble the Azure services and see the estimated monthly bill before you deploy.
The TCO Calculator compares on-premises CapEx with Azure. When the question is “should we migrate”, the Total Cost of Ownership Calculator is the tool that weighs your existing datacentre spend against operational Azure cost.

Keep those two calculators straight: Pricing = estimate a new Azure workload; TCO = compare against what you run on-premises today.

One honest caveat

The cloud is a shift in how you pay, not an automatic discount. Whether Azure is cheaper than owning hardware depends on the workload — which is precisely why Microsoft ships calculators to work it out. If a question offers “the cloud is always cheaper” as an option, be suspicious; the defensible answer is almost always the CapEx-to-OpEx framing, not a blanket saving.

How to use the questions below

Answer each one before you open the explanation, and when you miss, read past the correct option to why the others fail — the distractors here are the classic ones, like a Reservation dressed up as CapEx or the two calculators swapped. Get the reasoning right and this becomes a point you will never lose. For the wider area, see the Cloud Concepts domain and the AZ-900 cheat sheet.

Two columns compare spending models. On the left, CapEx is drawn as one large upfront block labelled buy and own the asset, depreciated over years — physical servers and a datacentre you purchase. On the right, OpEx is drawn as many small increments spread across a timeline, labelled pay for what you consume — Microsoft Azure pay-as-you-go billing. A wide arrow between them points from CapEx to OpEx, captioned the cloud shifts this way.

6 free AZ-900 practice questions

Answers and explanations — no email wall

AZ-900 Question 1 of 6

A company buys a rack of physical servers, installs them in its own datacentre, and lists them as assets it will depreciate over five years. In accounting terms, this spending is best described as which model?

Answer: A — A capital expense (CapEx) — a large upfront purchase of an asset the company owns

Buying and owning hardware you then depreciate is the textbook capital expense: a big sum spent once, up front, on an asset on your books. Why not the others: OpEx is ongoing spend for consumption, not an owned asset. Hardware is very much an expense. And the vendor does not change whether a purchase is capital or operational. Pro tip: own it and depreciate it = CapEx.

AZ-900 Question 2 of 6

A team moves the same workload onto Microsoft Azure and is now billed each month only for the virtual machines and storage it actually used. This billing pattern is an example of which model?

Answer: A — An operational expense (OpEx) — ongoing spend for what you consume

Azure pay-as-you-go is operational expense: a recurring, usage-based charge with no asset on your books. Why not the others: nothing is bought up front here, so it is not CapEx, and you do not own the virtual machines — Microsoft does. A monthly bill is still an expense. Pro tip: consume it and get billed = OpEx.

AZ-900 Question 3 of 6

AZ-900 material often says that adopting Microsoft Azure shifts spending from CapEx to OpEx. What does that shift actually mean?

Answer: A — Large upfront purchases of owned hardware are replaced by ongoing charges for the cloud capacity you consume

The move trades a big one-time capital outlay for a running operational charge that scales with usage — you rent capacity instead of buying and owning it. Why not the others: you still pay for computing, just differently. You buy no servers in advance; that is the old model you are leaving. And the shift runs CapEx to OpEx, not the reverse. Pro tip: cloud = renting, not buying.

AZ-900 Question 4 of 6

Before migrating, a business wants to compare the cost of running its workload in its own datacentre against running it on Microsoft Azure. Which Azure tool is built for this comparison?

Answer: A — The Total Cost of Ownership (TCO) Calculator

The TCO Calculator is purpose-built to weigh on-premises CapEx against the operational cost of Azure, so it is the migration business-case tool. Why not the others: the Pricing Calculator estimates the cost of Azure services alone, not the on-premises comparison. Azure Advisor gives optimisation recommendations for resources you already run, and Azure Monitor tracks health and metrics. Pro tip: TCO = compare with on-premises.

AZ-900 Question 5 of 6

A team has designed a new workload and wants an estimate of its monthly Microsoft Azure bill before deploying anything. Which tool should they use?

Answer: A — The Azure Pricing Calculator

The Pricing Calculator lets you assemble planned services and see an estimated future OpEx before you deploy. Why not the others: the TCO Calculator is for comparing against an existing on-premises setup, not costing a fresh design. Azure Cost Management reports on spend you have already incurred, and Microsoft Defender for Cloud is a security tool. Pro tip: Pricing Calculator = estimate before you build.

AZ-900 Question 6 of 6

A company commits to a one-year Azure Reservation for its virtual machines to earn a discount over pay-as-you-go. Does that commitment turn the spending back into a capital expense?

Answer: A — No — it is still operational expense, just a committed-usage OpEx discount rather than an owned asset

A Reservation is a pricing commitment that lowers your operational bill; you still own no hardware, so it remains OpEx. Why not the others: committing to a term does not create an owned, depreciating asset, and a discount never changes the spending category. Reservations are a paid commitment, not free. Pro tip: Reservations and savings plans discount OpEx — they do not become CapEx.

That is exactly how every question in the course works — answer, explanation, why-not. The real set continues in the practice player: 10 free questions, no sign-up.

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Those 6 questions were the start.

The exam does not test whether you recognise a term — it tests whether you can rule out three plausible answers under time pressure. That is what the explanations above are for, and there are 300 more questions built exactly like them.

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Frequently asked questions

Is moving to Microsoft Azure always cheaper?

No. AZ-900 frames the cloud as a shift in the spending model, not an automatic discount — you trade large upfront capital purchases for ongoing operational spending that scales with use. Whether that is cheaper depends on your workload; steady, predictable usage can even favour committed pricing. The exam rewards the CapEx-to-OpEx framing, not a blanket cheaper claim.

Are Azure Reservations a capital expense?

No. A Reservation is a usage commitment that discounts your operational bill; you still own no hardware and hold no depreciating asset, so it stays OpEx. Think of it as committed operational spending, not a return to buying and owning equipment.

Are these real AZ-900 exam questions?

No. They are our own questions, written in the style and difficulty of Azure Fundamentals and worded for this page. Reproducing real exam items breaks Microsoft's certification agreement and teaches you nothing about the question you have not seen. Learning why each option is right or wrong is what carries into the exam.

Updated for AZ-900 (July 2026). The sample questions above are our own work in the style of the exam — not real exam items. The exam itself is set and marked by the certification body.