Microsoft 365 rarely gets questioned. It’s just there — powering emails, Teams calls, shared documents, calendars, compliance, security.
It’s the digital plumbing of modern business. But while it quietly keeps everything moving, it can also quietly inflate your IT spend.
The truth? Most organisations aren’t intentionally overspending on Microsoft 365. It happens gradually. Licences get assigned “just in case”. Leavers aren’t always deprovisioned promptly. Users sit on E5 plans when an E3 — or even a Business Premium licence — would do the job perfectly well. Before long, you’re paying for capability that isn’t being used.
In 2026, with tighter budgets and increased scrutiny on operational spend, that kind of waste is harder to justify. The encouraging part is that reducing Microsoft 365 costs doesn’t mean stripping back productivity tools or frustrating your workforce. In fact, done properly, optimisation often improves visibility, governance and efficiency.
In this guide, we’ll explore how IT teams can cut Microsoft 365 costs by 15–20% (and sometimes more) by right-sizing licences, tightening provisioning processes, and taking advantage of new purchasing options — all without disrupting the way your people work.
1. Audit your licences and right-size them
If you do one thing this year, start here.
Most organisations are paying for licences that don’t match how people actually work. You’ll often find:
- Unused (or unassigned) licences sitting on the shelf
- Former employees still consuming a paid seat
- Users on E5 plans who only send emails and join Teams meetings
That last one is more common than you think. If someone doesn’t use advanced security, Power BI, or compliance tools, they probably don’t need your most expensive licence.
Downgrading from E5 to E3 — or from E3 to E1 or F3 in some cases — can reduce costs dramatically without affecting day-to-day productivity.
Don’t just check “last login” data. Look at what tools people are actually using. Then match the licence to the role — not the other way round.
Do this quarterly and you’ll prevent overspending from creeping back in.
2. Remove inactive licences and duplicate tools
When someone leaves, their licence should be removed immediately. If that process isn’t automated, money will leak every month. Tighten up your offboarding so licences are reclaimed or reassigned straight away.
Next, look for duplication. Are you paying for Zoom and Slack when you already have Teams? Dropbox alongside OneDrive? Standalone Power BI licences for users who might be better off on a bundle?
You’re often paying twice for the same capability — once inside Microsoft 365 and once outside it.
Standardising your stack and removing overlaps delivers instant savings.
3. Use usage data — not assumptions
Microsoft 365 optimisation isn’t a one-off clean-up, it’s ongoing.
Set up regular licence reviews using admin centre reports, Power BI dashboards, or third-party tools. Look for:
- Premium features that aren’t being used
- Add-ons sitting idle
- Users who could be downgraded
Most waste isn’t in completely inactive accounts. It’s in active users with oversized licences.
When you monitor consistently, you catch these issues early — before they turn into long-term budget drains.
4. Automate licence management
Manual licence management is slow and error-prone. Instead, build automation into your user lifecycle:
- Assign the correct licence during onboarding
- Automatically remove or adjust licences during offboarding
- Use group-based licensing where possible
- Schedule automated usage reports
Some organisations even flag users for downgrade if they haven’t touched premium features in months.
The goal is simple: licences should adjust as roles change — without someone needing to remember to do it manually.
5. Be smarter about how you buy
How you purchase Microsoft 365 matters just as much as what you buy.
Monthly flexibility now comes at a premium. If your headcount is stable, annual commitments can reduce per-user costs. A hybrid approach — core licences annually, flexible ones monthly — often works well.
Also keep an eye on price changes. With increases announced for mid-2026, timing your renewals carefully could protect your budget. Locking in pricing early or adjusting your licence mix before renewal can soften the impact.
Finally, speak to your Microsoft partner. Promotions, bundles, or negotiated terms can make a significant difference — especially for larger estates.
Final thoughts
Optimising Microsoft 365 costs in 2026 is really about combining smart housekeeping with some forward-thinking planning. Start with the basics: don’t pay for licences or features no one actually uses. Make sure every user has the licence that fits their needs — and reclaim any idle seats.