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Small business Office licensing: the cheapest legal setup by headcount

Licensing advice usually assumes an IT department. These plans assume a business owner with a card and twenty minutes.

Illustration of a three-desk small office with productivity app icons

One seat: sole trader or single-director company

A single perpetual Office licence plus mail from your existing domain host covers almost every one-person business. Move to Business Basic or Standard only when you want a professional mailbox with Exchange features such as shared calendars and retention.

  • Office 2024 Home & Business includes Outlook — the version most sole traders need
  • Microsoft 365 Personal is licensed for one person but permitted for business use
  • Microsoft 365 Family is explicitly household-only: not valid for business

Three to five seats: the perpetual sweet spot

At this size, per-seat subscription costs mount while your requirements stay simple. A three-person accounting practice or a five-person dental clinic typically needs document editing, a shared drive and reliable mail — nothing that requires a full collaboration suite.

  • Buy one perpetual licence per device, not per person, and match device count exactly
  • Keep mail with your domain provider or a single Business Basic tenant for shared mailboxes
  • Budget one spare licence for the machine that inevitably fails mid-year

Ten to twenty-five seats: split the estate

Above ten seats, roles diverge. Client-facing and management roles get real value from hosted mail, Teams and shared cloud storage; production, reception and back-office roles often do not.

Splitting the estate by role typically cuts 30–50% off a blanket subscription bill without breaking any licence term.

  • Collaboration roles: Microsoft 365 Business Standard or Premium
  • Document-only roles: perpetual Office per device
  • Shared machines (reception, workshop, till): perpetual, licensed per device

Rules that catch small businesses out

Three licence terms account for most compliance problems at this size.

  • Microsoft 365 Family and Home editions exclude commercial use
  • Perpetual Office is licensed per device, so two people sharing one PC need one licence, but one person with a laptop and a desktop needs two (unless the edition grants a secondary-device right)
  • Charity and nonprofit pricing requires an eligibility check before purchase, not after

Frequently asked questions

What is the cheapest legal Office setup for a 3-person business?
Three perpetual Office 2024 Home & Business licences, one per device, with mail kept at your existing domain host. That removes recurring cost entirely while staying fully licensed.
Can I use Microsoft 365 Family for my business?
No. The Family and Home editions are licensed for household, non-commercial use. Businesses need Microsoft 365 Personal, a Business plan, or a perpetual Office licence.
Is perpetual Office licensed per person or per device?
Per device. Each installation needs its own licence, which makes it very cost-effective for shared machines and less so for staff who work across several PCs.
Do nonprofits get discounted Microsoft licensing?
Yes, registered nonprofits can qualify for donated or discounted Microsoft 365 seats, but eligibility is verified against your registration before the discount applies.

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