Nobody sets out to overpay Microsoft. It happens by accretion: a licence bought for someone who left in 2024 and never released, a whole company put on the premium tier because one department needed it, an add-on bought to solve a problem a later plan update solved again, and a renewal that auto-runs every year because checking it never makes anyone’s list. Licence waste is the most reliably findable money in small business IT: in the licence audits we run, 15 to 30% of Microsoft spend is routinely recoverable, with no functionality lost and no staff noticing anything except, occasionally, the finance director smiling.
Here is where the waste hides, and the audit sequence that finds it.
First, know what the licences cost
You cannot judge waste without the price list. The UK annual-commitment prices since Microsoft’s July 2026 update: Business Basic £64.80 per user per year, Business Standard £129.60, Business Premium £202.80 (all ex VAT), with the full plan comparison covering what each tier buys. Three numbers, and every finding in the audit below converts into one of them.
The arithmetic that motivates the whole exercise: a 25-person business on all-Premium spends £5,070 a year. If eight of those people genuinely need Premium’s security stack and the rest are answering email and editing documents, the right mix runs closer to £3,300. Same tools in every hand that uses them; £1,700 back.
The five places the waste lives
1. Ghost licences
Licences assigned to people who left, mailboxes kept “just in case”, and duplicate accounts from renames. This is the crudest waste and the commonest: staff churn happens monthly, licence review happens never. The fix is a leaver process that reassigns or releases the licence on exit day (converting the mailbox to a free shared mailbox where continuity matters, which is the offboarding hygiene point again in licensing form).
2. Everyone-on-one-tier
The single most expensive convenience in Microsoft licensing: buying the same plan for all because it was simpler at setup. Tiers mix freely in one tenancy, and real businesses are mixtures: desktop-app users need Standard, staff with security-sensitive roles or company devices to manage justify Premium, and shop-floor, field or kiosk staff who need email and Teams but no desktop Office fit Business Basic, or frontline plans below it at a fraction of Standard’s price. Role-mapping the workforce is where the biggest single saving usually sits.
3. Add-on overlap
Add-ons bought separately that a tier upgrade now includes, or that duplicate each other: a third-party email-security product beside Premium’s Defender, an e-signature subscription beside included capability, storage add-ons nobody re-checked after a plan change. Each small monthly amount, none reviewed since purchase; collectively a steady leak. The audit question for every add-on: what includes this now?
4. The wrong-sized Copilot rollout
Copilot licences bought in an enthusiastic batch and used by a fraction of holders. Usage reporting shows exactly who opens it; licences follow the usage, and the pilot-then-expand pattern beats the batch buy.
5. Paying monthly for annual seats
Microsoft’s monthly-flexibility pricing carries a premium over annual commitment. Flexibility is worth paying for on genuinely seasonal seats; for the stable core of the workforce it is a surcharge with no beneficiary. Most businesses want a mix: annual for the base, monthly for the variable edge.
The audit, step by step
The whole exercise runs from the Microsoft 365 admin centre and a staff list:
- Export the licence assignment list and reconcile against current staff. Every licence with no living owner is an immediate finding.
- Pull the usage reports (admin centre, last 90 days): who has not signed in, which apps each person actually uses, who holds a desktop-app licence and only ever touches webmail. Usage data converts tier decisions from opinion to fact.
- Map roles to tiers. For each person: do they need desktop Office? Do they handle sensitive data or a managed device? Could they work from the web and mobile apps alone? The answers assign Basic, Standard or Premium, and frontline plans for the shop floor.
- Interrogate every add-on against the current tier’s inclusions, and check third-party subscriptions (backup stays; duplicated security and signature tools often go).
- Restructure the commitment: annual for stable seats, monthly for the flexible edge, and a diary entry to re-run this audit yearly, because accretion resumes the day you stop watching. It is the same discipline the IT budget needs generally, applied to its second-biggest line.
One caution from the truth-in-tools file: before releasing any licence, check what it is silently anchoring: a departed director’s account may hold the domain admin role, OneDrive files others link to, or app registrations. Release after transfer, not before, and take a backup of anything being retired.
Frequently asked questions
How much does Microsoft 365 cost per user in the UK?
Since July 2026: Business Basic £64.80, Business Standard £129.60, Business Premium £202.80 per user per year ex VAT on annual commitment, with monthly-flexibility billing priced higher. Frontline plans below Basic exist for email-and-Teams-only roles.
How much can a licence audit actually save?
15 to 30% of Microsoft spend is the routine range in SME audits, driven mostly by ghost licences and tier right-sizing. The percentage grows with time since anyone last looked; businesses that audit annually keep the number small, which is the point.
Can we mix different Microsoft 365 plans?
Yes, freely, within one tenancy: Basic, Standard, Premium and frontline plans side by side, each person on the tier their role justifies. All-one-tier simplicity is exactly what the audit usually unwinds.
What happens to a leaver’s mailbox if we remove the licence?
Convert it to a shared mailbox first (free, keeps the history and address receiving) or export what matters, transfer any ownerships, then release the seat. Deleting the account outright without those steps is how businesses lose files and admin access they did not know lived there.
Is it cheaper to buy Microsoft 365 through a provider?
Pricing is broadly the same list either way; what a provider adds is the audit discipline, the licence administration inside managed support, and someone whose job includes noticing the waste. Judge providers on whether they volunteer reductions, which tells you whose side of the invoice they optimise.
How often should we review licences?
Annually as a full audit, plus a leaver process that releases seats in real time. The two together keep recoverable waste near zero; either alone leaks.
Get the audit run on your actual tenancy
The free IT health check includes the licence review: your assignment list against your staff list, usage data against tiers, add-ons against inclusions, and the findings priced in the three numbers this page opened with. Most businesses leave with a smaller Microsoft bill and nothing missing. Get in touch and find out what your accretion number is.
