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CapEx is the spending of money on physical infrastructure upfront and then deducting that expense from your tax bill over time. CapEx is an upfront cost, which has a value that reduces over time and usually has no recurring cost. Deploying your own data center and Azure Reserved VM Instances are a few examples of the CapEx pricing model.
OpEx is spending money on services or products now and being billed for them now. You can deduct this expense from your tax bill in the same year. There’s no upfront cost but has a recurring cost. You pay for a service or product as you use it i.e. pay-as-you-go pricing.
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