Microsoft 365 Business Basic vs Standard: Which Licence Fits a UK Small Business in 2026?

Business Basic and Business Standard sit next to each other on Microsoft's UK pricing page at £5.40 and £10.80 per user per month. One line in the feature table separates them, and that line is the desktop Office apps. The rest of the difference deserves more thought than a side-by-side comparison gives it. We move UK SMEs between these two plans most weeks, and the decision is rarely about features on their own.

The real question is how your staff work through the day, what you already pay for elsewhere, and whether Copilot features in your plans for the next twelve months. Answer those properly and the licence choice mostly makes itself.

Microsoft 365 Business Basic vs Standard: the real cost

Microsoft prices both plans per user per month, and paying yearly is cheaper than paying monthly. The figures below are Microsoft's UK list prices as of September 2026 from the official UK business pricing page, they exclude VAT, and a reseller may quote something different.

Basic and Standard both cap at 300 users, so a 50-person business fits inside either plan without difficulty. Moving 25 users from Basic to Standard costs £1,620 a year. That is the figure to weigh against what the desktop apps are worth to your team.

What the extra money buys

Three differences matter in day-to-day work, and only one of them drives most of the upgrades we handle.

• Desktop Office apps: Business Standard includes installed Word, Excel, PowerPoint and Outlook on company devices. Business Basic gives you the browser and mobile versions only.
• Teams webinar hosting: Standard adds registration, attendee reporting and webinars for people outside the organisation. Basic includes meetings and calls, but not the webinar tools.
• Offline working: Installed apps keep working on a train or on site, while the browser versions stop when the connection does.

Everything else in the daily toolset is identical. Both plans give each user a 100GB primary mailbox, doubled from 50GB during 2026, plus a 50GB archive and 1TB of OneDrive storage. SharePoint is pooled across the whole tenant at 1TB plus 10GB for every eligible licence you buy, as set out in Microsoft's SharePoint storage limits, so capacity is shared rather than allocated to each person. Most businesses of this size never touch the extra storage charge, because the pooled allowance grows with every licence they add, and anything beyond it is bought in 1GB increments at around $0.20 per GB per month.

The mailbox increase is doing more work than it looks

Mailbox growth passes most businesses by until someone hits the limit. The move to 100GB removed the practical need for archive add-ons for almost every client we looked at this year.

What does not differ between the two plans

Both plans include Entra ID Free, multi-factor authentication, single sign-on, Exchange spam and malware filtering, Microsoft Purview Audit Standard, and Defender for Office 365 URL time-of-click protection. Neither goes further than that baseline. Device management and endpoint protection sit outside both plans, so a lost laptop stays a policy problem rather than a technical control. The tools that insurers, tenders and Cyber Essentials Plus assessors ask about arrive with Business Premium at £16.90 per user per month on annual billing.

We watched a 30-person professional services firm buy Business Standard and treat the security question as settled. It was not. Standard is a productivity plan with a baseline security layer attached to it. Our position is blunt: if you hold client data or answer security questionnaires, Standard is the wrong destination, and the route from Basic to Premium is usually shorter than Basic to Standard and then to Premium.

Buy one plan deliberately for each role, because split licensing across a small business creates more support work than the saving justifies.

When Business Basic is the right answer

Basic suits particular kinds of work rather than particular kinds of person. We keep clients on it when the job happens in email, Teams and a browser.

• Front-line, field and site teams who work from phones, tablets and shared machines.
• Warehouse and retail roles that need email, Teams and a browser for most of the day. Hospitality teams fit the same pattern.
• Businesses part way through a Google Workspace migration, where the desktop apps already exist on the other platform.

A 32-person engineering consultancy we worked with ran 12 office staff on Business Standard and 20 site staff on Business Basic, a split driven by job role rather than budget. Putting the whole company on Standard would have cost £1,296 a year more for desktop apps the site team had not opened in three years.

What changed in the 2026 pricing update

Microsoft's July 2026 update raised published UK list prices on both plans and added two things at no separate charge. Every user now gets a 100GB primary mailbox rather than 50GB, and both plans include Defender for Office 365 URL time-of-click protection as standard. The mailbox increase is the one that changes budgets for the better, because it removes an archive purchase that many SMEs were making by default.

A business that renewed before 1 July 2026 keeps the pre-update price on those seats until its next renewal, while one signing up today pays the current list price. That is why two firms with identical requirements can be quoted different numbers in the same month, and why comparing a quote without comparing the renewal date tells you very little.

Where Copilot changes the arithmetic

Copilot reshuffles the maths between these plans. Microsoft sells Business Standard with Copilot as a single subscription at £18.10 per user per month on annual billing. The standalone Copilot Business add-on is listed at £13.80 per user per month during a promotional period that runs to 31 December 2026, and it needs an eligible base plan underneath it.

The bundle undercuts the stacked option by £1.10 per user per month and brings the desktop apps with it. Across 25 users that gap is £330 a year, so there is little reason to buy Basic and bolt Copilot on top when the bundle costs less.

One change to watch sits behind that price. From 2 November 2026, new Copilot Business licences bought through a Microsoft Cloud Solution Provider will have usage-based billing switched on by default, with a metered budget for agent features. The licence fee does not move, but the bill for heavy agent use does.

Our advice is to put Copilot on a defined group first: the people who draft documents, summarise meetings and search shared files all day. Twenty-five seats of the add-on on top of Standard comes to £4,140 a year. Buy five, measure what changes in the first month, then decide, and read our Copilot readiness review if you want the assessment done for you.

Switching between the two plans later

Moving a user from Basic to Standard, or back again, takes minutes in the admin centre rather than a migration project. Licences are reassigned per person, billing adjusts on the next cycle, and no data has to move because the mailbox, OneDrive and SharePoint content stay exactly where they are.

Downgrades need one check first. Dropping from Standard to Basic removes the installed apps, so anything open on a laptop at that moment has to be saved before the licence changes. We set a rule that the switch happens at the end of a working day, with the affected staff told the day before.

How to decide in an afternoon

One export from the Microsoft 365 admin centre does most of the work. Work down the list below before you commit to an annual term.

• Pull the licence report and list who is on which plan today.
• Ask each team whether they open Word or Excel on a device with no internet connection.
• Model the annual figure at your headcount rather than the monthly one, because that is the number your finance lead will ask about. Monthly pricing flatters every plan.
• Check whether a tender, insurer or Cyber Essentials Plus assessment has asked about device management or endpoint protection.
• Price Copilot for a pilot group rather than the whole company.

The pattern across most of our SME clients is a mixed estate: Basic for front-line and field teams, Standard for anyone living in Excel and Word, and Premium wherever client data or an insurer's questions are involved. Mixed licensing is normal, and our Microsoft 365 consultancy work is largely about getting the mix right. What causes trouble is buying Basic by default and then finding the gap in the middle of an audit.

What we would do

For a typical 20 to 50 person UK business with office-based staff, we would put the office team on Business Standard or Business Premium, keep genuinely browser-only roles on Basic, and price Copilot for a pilot group before rolling it out any further.

Get the recommendation in writing before anyone buys anything. A short document that maps each role to a plan and shows the annual cost takes an hour to produce. We produce one for every client we move onto a new plan, because it stops the decision drifting back to whichever figure looked smallest in the meeting.

The whole exercise is best done before a renewal date rather than after one, when the invoice has already landed and the choices are narrower.