# Microsoft 365 Business Basic vs Standard vs Premium: What Differs > Compare Microsoft 365 Business Basic, Standard and Premium by what each adds, the 300-seat limit, Defender for Business and how to confirm current prices before you buy. Source: https://www.epifive.com/blog/microsoft-365-business-basic-vs-standard-vs-premium · Published 2026-10-25 · EpiFive ## Key takeaways - Business Standard includes Teams, cloud storage, business email and premium Office applications, and Business Premium includes everything in Standard plus security products. - Business Premium adds Microsoft Defender for Business and Microsoft Defender for Office 365 Plan 1 to the Business Standard feature set. - All three Business plans share one limit of 300 seats in total per organization, after which Microsoft recommends enterprise plans. - Defender for Business can be bought standalone for eligible Basic or Standard organizations, so Premium is not the only route to endpoint protection. - Prices change by region and billing term, so copy the per-user price from Microsoft's current pricing page rather than from an article. The three Microsoft 365 Business plans form a ladder. Business Basic is the entry plan. Business Standard includes Microsoft Teams, secure cloud storage, business email and the premium Office applications across devices. Business Premium includes everything in Business Standard and adds security products, namely Microsoft Defender for Business and Microsoft Defender for Office 365 Plan 1. This article explains what that means in practice and how to confirm prices yourself. ## Who this is for This guide is for owners, office managers and part-time administrators choosing a Microsoft 365 plan for a business with up to 300 people. By the end you will know what each plan adds over the one below it, what the shared seat limit means, which questions decide between Standard and Premium, and how to check the current price. A note on figures: this article does not quote per-user prices. Microsoft shows prices that vary by country, currency and billing term, and they change. Use Microsoft's current pricing page for your country. ## The plan ladder | Plan | What it adds | Source of the statement | |---|---|---| | Business Basic | Entry plan in the Business family | Microsoft Defender for Business documentation lists it as an eligible base plan | | Business Standard | Teams, secure cloud storage, business email and premium Office applications across devices | Microsoft 365 Business Premium FAQ | | Business Premium | Everything in Business Standard, plus Defender for Business and Defender for Office 365 Plan 1 | Microsoft 365 Business Premium FAQ | For the exact list of applications, the mailbox and storage quotas and the licence of every included service per plan, use Microsoft's plan comparison. Quotas and service names move between plans over time, and a table copied into an article goes out of date quickly. Microsoft's Business Premium FAQ links to a "Microsoft 365 User Subscription Suites for Small and Medium-sized Businesses" comparison document. ## What the security products add Business Premium is the plan to look at if protecting devices and email is a requirement rather than an afterthought. Microsoft describes it as a solution designed for organizations of 1 to 300 users that includes advanced security protection, next-generation protection, endpoint detection and response, and threat and vulnerability management. ### Defender for Business Defender for Business is an endpoint security product based on Microsoft Defender for Endpoint, designed for businesses with up to 300 users, offering protection from ransomware, malware, phishing and other threats on devices. Microsoft's comparison shows that it includes: - Next-generation protection and attack surface reduction. - Endpoint detection and response, described as optimized for small business. - Automated investigation and remediation and automatic attack disruption. - Core vulnerability management capabilities and threat analytics. - Simplified firewall and antivirus configuration for Windows. - Cross-platform support for Mac, iOS/iPadOS and Android. It does not include Microsoft Threat Experts or the extended data retention that Defender for Endpoint Plan 2 offers. Protection for Windows servers and Linux servers is available but requires extra licences. ### Defender for Office 365 Plan 1 The second security product in Business Premium is Defender for Office 365 Plan 1. Check Microsoft's Defender for Office 365 documentation for exactly what Plan 1 covers. ### The standalone route Premium is not the only way to get endpoint protection. Microsoft lists Defender for Business as available in two ways: standalone, for eligible Microsoft 365 or Office 365 organizations with up to 300 users, including those on Business Basic and Business Standard, and included in Business Premium. If your main need is endpoint protection on top of Standard, price the standalone product against the Premium difference before deciding. ## The 300-seat limit Microsoft's FAQ states that the Business base per-user plans are designed for organizations with up to 300 users only. An organization may provision up to 300 seats in total across the Business family, meaning Basic, Standard and Premium together. For example, if an organization has 250 seats of Business Premium, it can provision only 50 more seats across the Business family. Microsoft reserves the right to enforce the 300-license tenant limit, and recommends that larger organizations consider Microsoft 365 for enterprise plans. Plan for growth. If you could exceed 300 people within the next couple of years, compare the enterprise plans now rather than after a forced move. ## Mixed plans You can run different plans for different people. A common pattern is to give Premium to staff who handle sensitive data and a lower plan to others. Microsoft cautions that the security and management benefits of Business Premium are available only to users with devices managed with a Business Premium subscription. It recommends deploying Premium to all users for the best protection and consistent collaboration. A mixed estate gives uneven protection, so make a deliberate decision about who is covered and document it. You can switch from a qualifying Microsoft 365 plan to Business Premium, and Microsoft notes that this might increase or decrease the monthly charges. When you move people between plans, group-based licensing keeps assignments consistent. See [group-based licensing in Microsoft 365](https://www.epifive.com/blog/group-based-licensing-microsoft-365). ## How to choose ### Choose Business Basic when People mostly work in a browser or on mobile, you do not need desktop Office applications, and you will cover security with other measures. Confirm in Microsoft's comparison exactly which applications and services Basic includes before you commit. ### Choose Business Standard when Staff need the premium Office applications on their own devices alongside Teams and email, and you either have lower security requirements or plan to add Defender for Business separately. ### Choose Business Premium when You want one plan that covers productivity, email threat protection and endpoint protection, and you want to apply it to everyone who handles business data. Pair it with a tenant baseline: the [Microsoft 365 tenant security baseline](https://www.epifive.com/blog/microsoft-365-tenant-security-baseline) and [MFA rollout plan](https://www.epifive.com/blog/microsoft-365-mfa-rollout-plan) cover settings to apply on any plan. ### Questions that settle it | Question | If yes | |---|---| | Do we hold customer or financial data on laptops? | Endpoint protection is needed; price Premium or standalone Defender for Business | | Do people receive many external attachments and links? | Look at Defender for Office 365 Plan 1 in Premium | | Are we likely to exceed 300 users soon? | Compare enterprise plans now | | Do we want the lowest possible licence cost and accept more manual security work? | Basic or Standard with a security baseline | ## How to confirm the price 1. Open Microsoft's business plans and pricing page for your country. 2. Choose the billing term you will actually use, since annual and monthly terms can differ. 3. Check whether the displayed price includes or excludes tax. 4. Add up seats by plan and multiply, then compare Premium for everyone with Standard plus standalone Defender for Business for everyone. 5. Record the date, plan and price in your decision notes. If you buy through a Microsoft partner, ask the partner for a written quote that lists the term and renewal price. ## Troubleshooting purchase and licensing problems - You cannot add seats. You may have reached the 300-seat total across the Business family. Count seats across all three plans. - A user does not get Premium protection. The security benefits apply to users and devices managed under a Premium subscription. Check that the user has the licence assigned and the device is managed. - A licence will not assign. The user's usage location may be missing; see [the usage location error](https://www.epifive.com/blog/microsoft-365-license-usage-location-error). ## Decision checklist - Count users now and in two years against the 300-seat total. - List the applications each role needs and map them to a plan. - Decide whether endpoint and email protection are required. - Price Premium against Standard plus standalone Defender for Business. - Read the current price for your country and billing term. - Document who has which plan and why. ## References - Microsoft 365 Business Premium frequently asked questions: https://learn.microsoft.com/en-us/microsoft-365/business-premium/microsoft-365-business-faqs?view=o365-worldwide - Microsoft 365 Business Premium resources: https://learn.microsoft.com/en-us/microsoft-365/business-premium/ - Why choose Microsoft 365 Business Premium: https://learn.microsoft.com/en-us/microsoft-365/admin/security-and-compliance/m365bp-security-benefits - What is Microsoft Defender for Business: https://learn.microsoft.com/en-us/defender-business/mdb-overview - Microsoft 365 plans and pricing for business: https://www.microsoft.com/en-us/microsoft-365/business/with-teams-plans-and-pricing ## Frequently asked questions ### What is the main difference between Business Standard and Business Premium? Microsoft's documentation says Business Premium includes everything in Business Standard plus security products: Microsoft Defender for Business and Microsoft Defender for Office 365 Plan 1. Those add advanced threat protection, endpoint detection and response, and threat and vulnerability management. ### How many users can I have on Business plans? The Business base per-user plans are designed for organizations with up to 300 users, and the limit is 300 seats in total across Business Basic, Standard and Premium. Larger organizations should consider Microsoft 365 enterprise plans. ### Can I mix Business Basic, Standard and Premium in one tenant? Yes, you can combine plans in one organization within the 300-seat limit. However, Microsoft notes that the security and management benefits of Business Premium apply only to users with devices managed under a Premium subscription, so a mixed estate is only partly protected. ### Can I get Defender for Business without Business Premium? Yes. Microsoft lists Defender for Business as available standalone to eligible organizations with up to 300 users, for example those using Business Basic or Business Standard, and it is included in Business Premium.