Azure discounts come from external conditions - the partner sets the channel price, and existing Microsoft licences stack on top. GCP discounts come from internal conditions - one layer applies automatically, and commitments do not stack with it but are banded. Where to push differs completely.
Of the five providers, Azure and GCP have the most different discount mechanisms - they do not even share the same starting point on where a discount comes from.
Most cross-provider comparisons turn into feature tables, but the value of this pairing lies elsewhere: understanding each one discount philosophy tells you where to push. Mechanics in detail are in how to get Azure discounts and how to get GCP discounts; all five are in cloud discount mechanisms compared.
The conclusion first: they rely on completely different things
| Azure | GCP | |
|---|---|---|
| Where the discount comes from | External conditions: the channel plus licences you already hold | Internal conditions: usage shape plus commitment structure |
| What you have to do | Pick the right channel, account for what you own | Measure usage accurately, slice commitments correctly |
| The distinctive piece | The partner sets the channel price (unique among the five) | One layer applies automatically (unique among the five) |
| Easiest thing to get wrong | Assuming official discounts are everything and missing your existing licences | Adding the two layers percentages together |
In one line: how much you can save on Azure depends on what you already hold (channel tier, existing Microsoft licences); how much you can save on GCP depends on what your usage looks like (how steady it is, whether it can be interrupted). The directions differ, so "which is easier to save on" has no universal answer - first work out which side your conditions fall on.
Azure: the discount lives in the channel and your existing licences
Azure carries two mechanisms none of the other four have, and neither belongs to the "buy a commitment, get a discount" family:
- The channel model is CSP (Cloud Solution Provider), where the partner sets the discount. It is the only one of the five where the reseller is itself part of the pricing - elsewhere it is "official pricing plus partner rebate", on Azure it is the partner deciding the discount. The direct consequence: quotes vary far more than at any other provider, so "which channel" matters much more than "should I use one".
- Azure Hybrid Benefit. If you already hold on-premises Windows Server or SQL Server licences, they stack on top of reservations or savings plans - the benefit offsets the licence cost, while a commitment discount offsets the compute cost. They act on different parts of the bill and apply together. Nothing equivalent exists at AWS, GCP, Alibaba Cloud or Tencent Cloud.
⛔ The classic mistake is comparing instance unit prices alone. For a company holding Microsoft licences, comparing prices without accounting for Hybrid Benefit badly overestimates Azure cost - the licence component is a separate, removable block of the bill. The right order: isolate that licence component, stack the commitment discount on top, then compare across providers.
Beyond that, Azure also has the conventional three routes (reservations, savings plans, Spot), and enterprise procurement has a separate EA path. But those are not what makes Azure distinctive - the two mechanisms above are.
GCP: the discount lives in usage shape and commitment structure
GCP is the mirror image: it has a discount system that requires no conversation with anyone, but with the most layers and the highest chance of bad arithmetic.
- One layer applies automatically. Sustained Use Discounts take effect simply by running long enough within a billing cycle - no application, no commitment, no configuration. The only such layer among the five.
- Commitments come in two kinds. Standard CUDs lock in longer for a deeper discount; Flexible CUDs have shorter terms and shallower discounts.
- Plus interruptible capacity (Spot), with the highest published ceiling of the five.
Google publishes ceilings for each layer (official live pricing is authoritative): the standards differ between one-year and three-year commitments, with a higher band for memory-optimised machine types; flexible commitments sit lower; Spot goes deepest. Those figures illustrate the structure; they are not a promise.
Which tells you exactly where to push on GCP: since one layer applies automatically, what remains optimisable is the commitment structure - how long, how much, which kind. GCP optimisation is closer to an arithmetic problem than a negotiation. The experience on Azure is the opposite.
The official discounts, side by side
| Azure | GCP | |
|---|---|---|
| Automatic discount | None (everything must be bought or selected) | Yes (sustained use discount) |
| Commitment discounts | Reservations / savings plans | Standard CUDs / Flexible CUDs |
| Interruptible capacity | Spot | Spot |
| Distinctive mechanism | Hybrid Benefit (existing licences stack) | Automatic discount (no commitment needed) |
| Channel | CSP: the partner prices it | Partner Advantage |
| Official plus channel | Both apply (unit price plus what you pay) | Both apply (same) |
Note the last row: both behave the same way - official and channel discounts do not conflict. An official discount lowers the unit price on the bill; a channel discount lowers the amount you actually pay. It is not either/or, so "I use a channel, so I can skip the official options" is wrong at both providers.
Each has one "does not stack" rule
The most practical section on this page - the traps point in different directions, and both cause bad arithmetic:
| The rule | The error | |
|---|---|---|
| GCP | The automatic layer does not stack with commitments | Adding the two percentages ("30% + 55% = 85%" is wrong) |
| Azure | Hybrid Benefit and commitments do stack, but on different components | Assuming stacking means multiplying: one offsets licences, the other compute |
⛔ GCP is explicit that discount types cannot be combined, and the real model is banded: the usage covered by the commitment takes the commitment discount, and only usage above it takes the automatic discount. The right mental model is not "two discounts on top of each other" but "one band at this price, another band at that price". Plenty of third-party articles get this wrong.
Azure points the other way - do not be misled by "cannot be combined" reasoning there: Hybrid Benefit and reservations/savings plans genuinely apply together, but they save different money - one licences, one compute. So the return is more substantial than simple multiplication, and it is calculated by adding components, not multiplying rates.
How to choose: three questions
You do not need to study both mechanisms in full - three questions locate you:
- "Do we hold on-premises Microsoft licences?" Yes means the Azure cost curve changes immediately - Hybrid Benefit is a block nobody else has; no means that advantage is zero for you and Azure competes on level terms.
- "Is our load steady, and do we want to manage it?" Want minimal management with steady usage means the GCP automatic layer is low-effort; willingness to spend time comparing channels with room to negotiate means the Azure CSP route may land a lower actual price.
- "Is compute the largest line?" Both providers discount mechanisms act mainly on compute-shaped usage. If your largest line is traffic, storage or databases, commitment discounts have limited leverage - understand those lines first (see why your AWS bill jumped).
A practical order: try the free allowance first (Azure free account / GCP free trial) → understand the bill shape → then decide between official commitments, a channel, or both. Do not start negotiating discounts before you know what the bill is made of.
FAQ
Which is easier to get discounts on?
It depends what you mean by easy. GCP is easier to obtain automatically - one layer applies with no action at all, and the commitment only asks you to do the arithmetic. Azure is easier to get a lower actual price from - channel pricing has more room, provided you are willing to compare channels. One favours effortlessness, the other trades effort for a lower price.
I already hold Microsoft licences - should I necessarily choose Azure?
Not necessarily. Hybrid Benefit materially changes the cost structure, but it is not the only variable - region, latency requirements, team familiarity and the cost of migration all count. How to judge: price the licence component separately on Azure, see what it saves, then place that into the wider comparison. Comparing instance unit prices alone gives the wrong answer.
Does the GCP automatic discount get "eaten" by commitments?
Not eaten, but the structure of what you actually receive changes: usage covered by the commitment takes the commitment discount, and only usage above it takes the automatic discount. So over-committing is not worthwhile (the excess only earns the automatic band), and under-committing wastes the deeper band. Sizing that quantity correctly is the whole game.
Can I use both providers discounts at once (running on Azure and GCP)?
A commitment discount is a contract with one provider and cannot be used across providers. If you run on both, plan the commitments separately - and that is also why you should not fill both at the same time: if the business changes, neither can be returned.
How do their channel discounts differ?
Significantly: the Azure channel (CSP) is itself part of the pricing, with the partner setting the discount, so quotes vary most; the GCP channel (Partner Advantage) is closer to "official pricing plus partner benefits", with less room. So the leverage from switching channel is visibly larger on Azure. Three questions for vetting a channel are in where to find AWS discount information you can trust; specific pricing is in Azure discounts and reseller pricing and GCP discounts and reseller pricing.