Commitment tiers can reduce costs by up to 52% compared to Pay-As-You-Go, yet monthly bills can still be unpredictable for security leaders. Many organisations struggle to justify extensive log ingestion and understand the differences between Analytics and Data Lake tiers. This guide explains Microsoft Sentinel pricing in clear terms, helping you control billing, avoid unexpected costs and make your security budget work harder for resilience.
Predictable security budgets start with disciplined data categorisation and storage. In this guide, we break down the 2026 cost structure, including the 50 GB-per-day promotional tier available until March 2027. You will see how to identify free data sources, benefit from the Data Lake’s 6:1 compression, and use a strategic MXDR partnership to control costs without compromising protection. This approach gives your organisation a stable, transparent foundation for secure growth.
Microsoft Sentinel Pricing Structure: Analytics & Data Lake Tiers
Security Information and Event Management (SIEM) has evolved. Data volume no longer means unpredictable costs. To understand Microsoft Sentinel pricing, start by distinguishing the two main data ingestion paths and what each is for. From 2026, the move to the Unified Microsoft Defender portal brings Log Analytics and Sentinel charges together into one clear billing stream. This change lets security leaders focus on outcomes, not administration.
The Analytics tier is for high-value data that needs immediate action, such as logs for real-time detection, alerting and automated response. The Data Lake tier is for storing forensic data that does not need instant alerts. By separating data by purpose, you maintain full coverage and avoid unnecessary costs.
High-Value Analytics vs Low-Cost Storage
Placing the right data in the right tier is essential. Identity logs, threat intelligence and endpoint alerts should be routed to the Analytics tier to enable rapid response and clear visibility. High-volume sources, such as firewall or proxy data, are best suited to the Data Lake, supporting historical analysis and compliance without driving up costs. Managed MXDR helps you fine-tune this balance, so every byte ingested supports your growth and resilience.
Commitment Tiers & Pay-As-You-Go: Calculating Your Daily Reservation
Choosing between Pay-As-You-Go and commitment tiers shapes both your security and your budget. Pay-As-You-Go suits smaller organisations or those with changing log volumes, offering flexibility. As your telemetry grows, commitment tiers bring predictability and significant discounts for reserving a set daily volume.
In 2026, scaling up brings real savings. The Pay-As-You-Go rate is $4.30 per GB, but a 100 GB daily reservation cuts this to about $2.96 per GB, saving 31%. For larger needs, a 5,000 GB daily commitment drops the rate to $2.31 per GB. This tiered model means you can increase visibility without runaway costs.
Choosing the right tier requires care due to the 31-day rule. Increase your commitment when you need instant savings, but wait 31 days before reducing it. This makes disciplined log management essential to avoid paying for unused capacity. If you are unsure which reservation fits your needs, speak with our specialists to review your telemetry and optimise your spend.
Choosing the Right Model for Your Organisation
Start with the Microsoft Sentinel cost estimator to forecast your 2026 spend. For mid-sized UK businesses, the 50 GB commitment tier in public preview is worth close attention. With a break-even point of around 38 GB per day, this tier offers a 25% savings over Pay-As-You-Go and is fixed until March 2027. This helps you stabilise your security budget while keeping full coverage for modern threats.
Strategic Cost Management: Free Data Ingestion & Log Filtering
Efficient security starts with knowing which telemetry streams deliver the most value for the lowest cost. Microsoft allows you to ingest Azure Activity Logs, Sentinel Health and Office 365 Audit Logs at no extra charge. Security alerts from Microsoft Defender are also free from standard consumption costs. By focusing on these streams, you keep strong visibility and protect your budget.
Larger environments can benefit from a 5 MB-per-user daily credit, which is often missed by internal teams. This applies to users with Microsoft 365 E5, A5, F5 or G5 licences. Multiply your eligible users by 5MB to see how much daily data is deducted from your bill. This credit helps decision makers balance security and cost.
Effective data management requires technical resolution and disciplined filtering. Utilising Kusto Query Language (KQL) to identify, filter and transform redundant telemetry before it hits the billing meter is a hallmark of a mature security strategy. Applying log transformation rules at the point of ingestion can reduce monthly costs by up to 30 per cent without compromising your defensive capabilities. If you require a tailored assessment of your current data flows, you can speak with our security architects to identify immediate savings.
Eliminating Bill Shock with Proactive Governance
Proactive governance underpins a predictable security budget. Setting Azure cost alerts gives your team instant notice if data ingestion goes over daily limits. This oversight is essential for aligning retention with UK regulatory requirements and avoiding unnecessary storage costs. A disciplined approach ensures your security investment supports growth and recovery.
Managed MXDR & Sentinel: Driving ROI for UK Organisations
Managing SIEM internally often leads to a mismatch between data volume and security value. Without ongoing tuning, organisations risk high bills or gaps in visibility that put assets at risk. Efficiency comes from moving beyond reactive billing to a proactive, mature security model. By working with an experienced partner, you make sure every pound spent on ingestion strengthens your ability to withstand and recover from threats.
CyberOne acts as a specialised extension of your internal leadership team, providing the professional rigour needed to maintain a predictable budget. This partnership model eliminates the operational burden of manual log filtering and commitment tier monitoring. You don't just gain a vendor; you gain a partner who provides the clarity and action required to align technical capabilities with business outcomes. This ensures that your security posture remains high-performing and sustainable whilst supporting measurable organisational growth through every stage of the threat lifecycle.
The CyberOne Advantage for Microsoft Security
Combining Sentinel with Managed MXDR delivers comprehensive threat detection beyond basic log collection. Our specialists continuously tune your SIEM to keep detection rules effective and costs under control. Our Cyber Maturity Assessment finds cost-saving opportunities in your Microsoft stack by identifying unused licences or features. This approach moves your organisation from basic protection to lasting digital resilience, using Microsoft Sentinel pricing as a lever for success.
Achieving Strategic Stability & Financial Predictability
Mastering the intricacies of Microsoft Sentinel pricing requires more than just technical knowledge; it demands a disciplined approach to data governance and storage. By aligning high-value logs with the Analytics tier and utilising the Data Lake for long-term retention, you can maintain a high-performing security posture without the risk of unpredictable costs. This balance between visibility and fiscal responsibility is essential for organisations seeking to navigate the complexities of the 2026 security landscape whilst ensuring sustained recovery from inevitable risks.
Find out where you could be saving. Schedule a Microsoft Sentinel optimisation assessment with CyberOne to uncover cost-saving opportunities, improve operational efficiency, and ensure your security platform is delivering maximum value.
