Need help upgrading from Personal to Family subscription (billing not adjusted)

Question

I currently have a Microsoft 365 Personal subscription, which I paid $159 for in October 2025. I would like to upgrade to a Microsoft 365 Family subscription, which costs $179, but when I try to upgrade, I am being charged the full $179 instead of the pro-rata difference.

Could you please advise how I can upgrade my subscription while only paying the price difference, taking into account the amount I have already paid?

Answer 1

It is not possible to switch to the Family version by just paying the difference between the two subscriptions, on the link below, Microsoft provide the process to switch to a different version of Microsoft 365, when you switch to a new subscription that contains more features like from Personal to Family, you are charged for a full new subscription, then the remaining time on the Personal subscription will be converted to the Family version on a pro-rata percentage basis (usually 92%), check the expiry date on your subscription now after the new purchase, it should be well over 12 months.

https://support.microsoft.com/en-au/office/switch-between-microsoft-365-subscriptions-3fcc1efc-2722-427f-8efa-db94b9b0a36b

Answer 2

To pay only the upgrade difference from Microsoft 365 Personal to Microsoft 365 Family, the subscription must be switched as an in-place upgrade on the same Microsoft account, not purchased as a separate, new subscription.

From the provided information, switching to a plan with more features works like this:

1. Buy the Microsoft 365 subscription to switch to (Microsoft 365 Family) using the same Microsoft account as the current Personal subscription.
2. The remaining days on the current Personal subscription are automatically converted and added to the new Family subscription. The number of days added is adjusted based on the plan change, not a direct cash refund.
   • When upgrading from Microsoft 365 Personal to Microsoft 365 Family, 92% of the remaining time on Personal is converted into additional days on Family.

This means the system does not charge “only the $20 difference” as a simple price delta; instead, it:

• Charges for a new Family subscription, and
• Converts the unused portion of the existing Personal subscription into extra time on the Family subscription at a 92% rate.

To ensure this works correctly:

1. Go to account.microsoft.com/services and sign in with the Microsoft account that has the current Personal subscription.
2. Purchase Microsoft 365 Family from there using that same account (not as a separate, unrelated subscription or via a different store account like Apple/Google).
3. After purchase, verify that the new expiry date for Microsoft 365 Family reflects additional time (converted from the remaining Personal subscription).

If the Personal subscription was purchased through a third-party billing partner (Apple App Store, Google Play, or a retail partner), that partner controls subscription management and may not support automatic upgrade credit. In that case, contact the billing partner’s support via the Manage link for the subscription at account.microsoft.com/services to ask what upgrade or credit options they provide.

If the account is being charged the full Family price without any extension of the subscription end date (no converted time added), contact Microsoft account and billing support so they can review the subscription and billing details.

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References:

• Switch between Microsoft 365 subscriptions
• Upgrade to Microsoft 365
• How can I upgrade from a Microsoft 365 Personal to Family subscription?