I bought 25 licenses by mistake

Reduce the existing Microsoft 365 business subscription from 25 licenses to a total quantity of 6 rather than canceling and reactivating it.

Reduce the license count

1. Sign in to the Microsoft 365 admin center.
2. If more than six licenses are assigned, first unassign licenses from 19 users; Microsoft does not allow the subscription quantity to fall below the number currently assigned.
3. In Simplified view, select Subscriptions. In Dashboard view, go to Billing > Your products.
4. Select the affected subscription.
5. Select Remove licenses.
6. In New quantity > Total licenses, enter 6—not 19.
7. Select Save.

License removal requires recurring billing to be on. The resulting bill should include any credits that are due, usually within one to two days.^1^

How the invoice adjustment depends on the agreement

Check Microsoft 365 admin center > Billing > Billing accounts and read the Billing account type column.^2^

• Microsoft Customer Agreement (MCA): Licenses can normally be removed only within seven days of purchase or renewal. If that window has closed, the reduction takes effect at renewal and appears on the first invoice after renewal.
• Microsoft Online Subscription Agreement (MOSA): After the quantity is reduced, the next invoice deducts the previous charge, adds the prorated charge for the period when 25 licenses applied, and charges for the new quantity for the remainder of the billing period.^1^

Therefore, the unused 19 licenses are not necessarily nonrefundable; the credit depends on the billing agreement, timing, and purchase channel. The estimate of 6 × $6.48 = $38.88 plus tax is valid only if $6.48 is the current per-license price for the plan and billing term.

If Remove licenses is unavailable

Use Help & support in the Microsoft 365 admin center and request a billing adjustment for the accidental purchase:

1. Select Help & support at the bottom right.
2. Enter:
   “Accidentally purchased 25 licenses; need 6 total. Please review invoice G198392955 and credit the unused 19 licenses.”
3. If the suggested results do not resolve it, select Contact Support.
4. Choose phone or email and submit the request.

Only a business-subscription administrator can open this support request. If every subscription was purchased through a partner, the partner must handle the request instead.^3^

If the subscription shows Reseller as its purchase channel, contact that reseller directly. If it is prepaid and activated with a product key, licenses cannot be removed during the current term; renew later using a product key for six licenses.^1^

References

1. Buy or remove licenses for a Microsoft business subscription
2. Understand your Microsoft business billing account
3. Get support for Microsoft 365 for business