Microsoft 365 cost for a small business: build a complete budget
The Microsoft 365 cost for a small business is more than the licence price. Your budget also needs to cover any setup, migration and ongoing management your business requires.
If you are preparing a rollout or reviewing a renewal, build two figures: the supplier costs you expect in the first year, and the annual running cost (run-rate) of the agreed setup afterwards. Keep your team's time alongside those figures, rather than hiding it inside them.
This guide gives you a worksheet for that conversation. It is not a quotation or a recommendation to buy a particular plan.
Start with what people need, not a price per employee
List who needs access and what they need to do. For example, do they need installed desktop apps, or will browser-based tools meet their requirements? What security and device-management arrangements does the business need? Is there existing email or file data to move?
Use those requirements to agree the licences and services required. Do not assume every employee needs the same plan, or that headcount alone determines the licence count.
If you are still choosing between plans, our Business Basic, Standard and Premium comparison explains the differences. Here, the question is narrower: once you have a proposed setup, what belongs in its budget?
Microsoft 365 cost for a small business: five budget lines
For each line below, record the amount, whether it is one-off or recurring, the payment date and what is included. Use “quote required” for anything unknown. A blank is not a zero.
1. Licences and subscriptions
Write down the exact plan and variant, the number of licensed users and the billing basis. Check whether Teams or any other required extras are included in the quoted version.
Record commitment length separately from payment frequency. “Per user, per month” can describe a monthly equivalent for a subscription paid annually. Compare quotes on the same basis and check whether VAT is included.
2. Setup, migration and temporary overlap
Ask what the one-off work covers: account configuration, moving agreed email and files, preparing devices, testing and handover. The starting point and scope affect the work involved.
Also check whether you will temporarily pay for both your old and new services. Put any confirmed overlap or transition charge here, with an end date. Our Microsoft 365 migration checklist can help you prepare the information a supplier needs.
3. Ongoing administration, security and support
Agree who will manage users and licences, maintain the agreed configuration and help people when something goes wrong. A licence gives you access to licensed features; it does not establish who will configure and operate them for your business.
Before adding a charge, check what is already included in your licences, existing support agreement and any Microsoft 365 management fee. Do not count the same service twice. Equally, do not assume a feature is being managed simply because the licence includes it.
4. Optional tools and additional services
Include only extras you have agreed you need, such as separately supplied backup or a specific add-on. Record any setup cost and recurring charge separately.
This is a scope check, not a shopping list. Not every business needs every optional service, and these budget lines do not mean Cache4 charges for each item separately.
5. Staff time and adoption
Allow time for preparation, testing, learning new ways of working and helping colleagues after the change. Record who will do it and how many hours you expect to need.
Keep those hours outside the supplier-cost total. Existing salaries are not automatically extra cash expenditure, although staff time still has a business cost.
Record any extra payroll costs, such as overtime, separately from supplier totals. Put purchased training or temporary cover in the relevant supplier line once, if needed.
Worked example: five Business Basic licences
On 20 October 2026, Microsoft's UK pricing page listed Microsoft 365 Business Basic with Teams at £5.40 per user per month, paid yearly, excluding VAT, with an annual auto-renewing subscription.
For five licensed users, the subscription arithmetic is:
5 × £5.40 × 12 = £324 per year, excluding VAT.
That is £27 per month as an equivalent, not a monthly-billing offer. Business Basic is used here only to demonstrate the calculation. It is not a recommendation for every five-person business, and this is not Cache4 pricing. Check the current price and terms before committing.
Choose the start and end dates of your first-year budget. Copy the following worksheet into your budget and replace the unknowns with your actual quote:
Licences: £324 for the first year in this example. For later years, enter the applicable renewal price rather than assuming it stays unchanged.
Setup, migration and temporary overlap: quote required. Record agreed one-off charges separately from any recurring service retained afterwards.
Ongoing administration, security and support: quote required, or identify the amount already included in an existing agreement. Record the annual amount attributable to this scope once.
Optional tools and services: quote required if needed. Separate setup charges from annual recurring costs; mark “not required” where that is the agreed decision.
Staff adoption time: enter hours and owners separately. Record extra payroll costs separately; include purchased training or cover once in the relevant supplier line.
You now have the structure for two supplier-cost totals:
First-year supplier-cost total = subscriptions payable in year one + agreed one-off and transition charges + ongoing supplier charges payable in year one + agreed optional supplier costs payable in year one.
Ongoing annual run-rate = the annual cost of the subscriptions and services you intend to keep, at the prices and scope used for your forecast.
Exclude completed one-off work from the run-rate. If something starts part-way through year one, use the amount actually payable that year for the first figure and a full year's cost for the second. The run-rate is a planning figure, not a guarantee of next year's bill.
Compare supplier costs on the same VAT basis. For cash-flow planning, use full invoice amounts, including any VAT charged, and their actual payment dates.
Add any extra internal cash expenditure, such as paid overtime, that is not already counted in those invoices. Keep existing staff hours separate. Apply the same distinction when forecasting any recurring internal expenditure.
Until the unknowns are resolved, £324 is only the known licence component, not a complete budget.
Illustrative full-budget example
The following service charges are invented solely to show the arithmetic, not Cache4 prices or market estimates.
Assume a twelve-month budget with five licences costing £324 for the year, one-off setup of £600 and an ongoing service at £50 per month for all twelve months. All amounts exclude VAT. Assume no transition overlap or optional tools are needed.
First-year supplier cost: £324 + £600 + (12 × £50) = £1,524 excluding VAT.
Ongoing annual run-rate: £324 + (12 × £50) = £924 excluding VAT, assuming unchanged licence and service prices. The one-off setup charge is excluded.
Record an illustrative 10 staff hours for preparation and adoption separately. Do not add existing salaries to the supplier total.
Before approving the actual budget, the budget owner checks licence fit, service scope, invoice dates, VAT and any missing costs against the supplier quotes.
Compare the scope as carefully as the total
Before approving a quote, check these points with the supplier:
Is it the same plan, variant, licence quantity and set of extras?
What are the commitment length, billing frequency and VAT treatment?
What setup and migration work is included, and what is excluded or dependent on assumptions?
Who owns configuration, ongoing administration and user support?
Which charges are already covered by another agreement?
What are the renewal date and any notice deadline, and what happens when user numbers change or if you need to cancel?
Do not assume different suppliers or subscriptions have identical cancellation or seat-change terms. Get the terms that apply to your proposal in writing.
Turn the worksheet into an agreed plan
Gather your current licences, renewal dates and user requirements. Add comparable quotes to the worksheet, calculate the first-year total and ongoing run-rate, then review the scope and unresolved assumptions with the person responsible for the budget.
Cache4's Microsoft 365 service covers help with choosing licences, setup, migration where needed, training and ongoing management. The starting point is understanding what you have and what your team needs.
If you would like help defining that scope, book a discovery call. Bring your current licence list, renewal dates and a short outline of any email or files you need to move, so the conversation starts with your actual requirements.
Pricing checked on 20 October 2026. Recheck the supplier's current price, scope and terms before making a purchase or renewal decision.
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