Azure pricing and cost management topics make up 30–35% of the AZ-900 exam, making this one of the highest-weighted domains. Understanding how Azure charges for services — and how to control those costs — is essential for passing the exam and for real-world cloud adoption.

Pay-As-You-Go

The default Azure pricing model. You pay only for what you consume, billed by the second or hour depending on the resource. There are no upfront commitments and no cancellation fees. This model is ideal for unpredictable workloads and is the most flexible option — but it carries the highest per-unit price.

Reserved Instances (Reserved VM Instances)

Reserved Instances allow you to commit to using a specific VM size in a specific region for a 1-year or 3-year term in exchange for significant discounts — up to 72% compared to pay-as-you-go pricing. Reservations are available for VMs, SQL Database, Cosmos DB, and other services. They can be paid upfront (largest discount), monthly, or a mix of both. Reserved Instances are best for steady-state, predictable workloads.

Spot Pricing

Azure Spot VMs let you access unused Azure compute capacity at up to 90% discount versus pay-as-you-go. The trade-off: Azure can evict spot VMs with 30 seconds notice when capacity is needed elsewhere. Spot VMs are ideal for batch processing, rendering, stateless applications, and other interruptible workloads.

Dev/Test Pricing

Microsoft offers reduced rates for development and testing workloads through Azure Dev/Test subscriptions (linked to Visual Studio subscriptions). These discounts apply only to non-production environments and cannot be used for production SLAs. Dev/Test pricing covers VMs, SQL, App Service, and more at significantly reduced rates.

Azure Hybrid Benefit

Azure Hybrid Benefit lets customers bring their existing on-premises Windows Server or SQL Server licenses (with active Software Assurance) to Azure, saving up to 40% on Windows VMs and up to 55% on SQL Database. Combined with Reserved Instances, savings can reach 80%+.

Understanding what drives Azure costs is key to both the AZ-900 exam and effective cloud financial management. Six major factors influence your Azure bill:

1. Resource Type

Different Azure resources have different pricing structures. Virtual machines are billed by compute hours and size. Storage accounts charge by GB stored and operations. Azure SQL Database charges per DTU or vCore. Always check the resource-specific pricing page.

2. Consumption (Usage)

Most Azure services follow a consumption model — the more you use, the more you pay. Some services (like Azure Functions) offer a free tier of executions per month before billing begins.

3. Region

Azure services are priced differently by region. Regions with higher operational costs (e.g., Brazil South, Japan) typically charge more than US or European regions. Choosing a less expensive region for non-latency-sensitive workloads can reduce costs significantly.

4. Bandwidth (Data Transfer)

Inbound data to Azure is generally free. Outbound data transfer (egress) is charged — the first 100 GB/month is often free, then tiered pricing applies. Data transfer between Azure regions (inter-region) also incurs charges.

5. Support Plan

Azure support plans range from Basic (free, included with all subscriptions) to Developer (9/mo), Standard (00/mo), Professional Direct (,000/mo), and Premier (custom). Higher tiers offer faster response times and dedicated support.

6. Subscription Type

Your Azure subscription type affects pricing. Free Trial subscriptions get 00 credit for 30 days. Pay-As-You-Go, Enterprise Agreements (EA), and Cloud Solution Provider (CSP) subscriptions each have different pricing structures and discount eligibility.

Cost Savings Strategies

The AZ-900 exam tests knowledge of how to reduce Azure costs. Key strategies include:

• Reserved Instances: Up to 72% savings for committed 1- or 3-year terms
• Azure Hybrid Benefit: Use existing Windows Server/SQL Server licenses — up to 40-55% savings
• Spot VMs: Up to 90% discount for interruptible workloads
• Auto-shutdown: Schedule VMs to shut down during off-hours for dev/test environments
• Right-sizing: Resize over-provisioned VMs to a smaller SKU
• Azure Advisor: Free built-in tool that gives personalized cost recommendations
• Choosing the right region: Select lower-cost regions for non-latency-sensitive workloads

Tags for Cost Allocation: Azure resource tags are key-value pairs (e.g., Department: Marketing, Environment: Production) that you apply to resources and resource groups. Tags enable you to organize your bill, filter cost analysis by tag, and implement chargeback/showback models — allocating costs to specific teams or projects. Tags do not inherit automatically from resource groups to resources; they must be applied explicitly. You can enforce tagging policies using Azure Policy.

For a deeper understanding of governance controls including Azure Policy, see our AZ-900 Governance Guide. These cost principles build on the foundational cloud concepts covered in the AZ-900 Cloud Concepts Guide.

Azure Cost Management + Billing is a built-in Azure service that gives you full visibility into your cloud spending. It is free for Azure customers and available directly in the Azure portal. Key capabilities include:

Cost Analysis

Visualize your spending over time with charts and breakdowns by resource group, service, tag, location, or subscription. You can filter by date range, compare months, and identify cost spikes quickly.

Budgets

Set monthly or quarterly spending budgets for subscriptions or resource groups. Budgets track your actual or forecasted spending against a defined threshold and can trigger alerts automatically.

Cost Alerts

Three types of alerts are available: budget alerts (spending reaches threshold), credit alerts (Azure monetary credit balance is consumed), and department spending quota alerts (for Enterprise Agreement customers). Alerts are sent via email to designated recipients.

Recommendations via Azure Advisor

Azure Advisor integrates with Cost Management to surface cost optimization recommendations — such as resizing underutilized VMs, deleting idle resources, buying reservations for consistently running VMs, and more. Azure Advisor is free and checks five categories: Cost, Security, Reliability, Operational Excellence, and Performance.

For comprehensive exam preparation, visit our AZ-900 Complete Study Guide and review AZ-900 Exam Tips for time-saving strategies on test day.