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Microsoft sells its Family plan as one subscription for up to six people, and since early 2025 it has sold that plan with Copilot built into Word, Excel and PowerPoint. Now open Word on your partner's laptop. They're signed in with their own account, on your plan, and the Copilot button asks them to buy something. That is Microsoft 365 Family Copilot as it actually behaves: the price covers the household, the AI covers whoever pays the bill.

Why does Microsoft 365 Family Copilot stop at the owner?

Microsoft licenses the AI features in Word, Excel, PowerPoint, Outlook and Designer to the person who pays, so family members share the apps and storage while the in-app AI answers to the owner's account alone.

Microsoft's own Copilot FAQ for Family and Personal subscriptions says it without hedging: those AI features "are only available to the subscription owner and cannot be shared with others" (retrieved 30 September 2026). At the kitchen table that reads simply. Your teenager drafting an essay and your partner building a budget both see the button. Neither can use it on your plan.

I think this is the most wasted opportunity in Microsoft's consumer lineup. Family puts Office in front of people who would never pay for it, exactly the audience Copilot needs to win. Members get the free Copilot chat app instead, and nothing inside their documents. The throttling logic is familiar from what a $20 AI chatbot plan buys before it throttles; here the limit isn't how much you use, it's who you are.

Designer is on the same list, so a member making a school poster should look at our Figma AI, Adobe Firefly and Canva Magic Studio comparison instead. Why Microsoft drew the line at the owner isn't documented. My read, and it is only opinion, is a compute-cost decision dressed as a licensing rule.

Four numbers decide whether the rule is an annoyance or a bad deal. NBC News reported in January 2025 that Microsoft raised consumer prices as Copilot entered the apps; Office Watch reported the Family plan's monthly AI credits in March 2026. The last cell is my own division of the increase by a year of credits.

The credit allowance bites hardest. It isn't a pool split six ways. It belongs to the owner and resets monthly, so a family picturing Copilot helping with homework is really looking at one person's quota.

Family or Premium: which plan fits a shared household?

Family suits most shared households, because Premium only raises the owner's own Copilot allowance; neither plan lets the other five members use Copilot inside Word, Excel, PowerPoint or Outlook.

The usual forum advice is to step up to Premium. It isn't a fix: Microsoft's pricing page prints the same owner-only footnote under both plans.

Premium earns its extra cost in one case: the owner runs out of credits most months. For anyone else, the route to Copilot in the apps is Microsoft 365 Personal, listed at $99.99 a year for one person.

What catches sharing households out

The owner-only rule catches households twice: at renewal, when an AI-era price arrives for a plan where one person gets the AI, and at homework time, when a member finds the Copilot button asking them to subscribe.

No consumer tier fixes it. Even Microsoft 365 Pro, at $99.99 a month and pitched on "highest usage", carries the same owner-only footnote. At that price, a plan sold to six people should at least let the owner assign seats.

The cheaper exit isn't advertised. Office Watch reported in January 2026 that Classic plans, which drop Copilot, "might be offered to people who try to cancel". It's a retention offer, not a menu item. Members keep the free Copilot app, and the AI browsers we compared against Chrome cover a lot of that ground for nothing.

• A member's Copilot prompt in Word leads to a purchase page, not to your plan.
• Classic removes Copilot for the owner too, so check your own use before asking for it.
• A member who buys Personal while staying on your plan pays twice for apps and storage, so free up their seat.

This week, before the plan renews, ask the household one question: who actually wants Copilot inside their documents? If it's one person, move them to their own Personal plan. If it's only you and you rarely touch it, start a cancellation and see whether Classic appears. Either way, stop paying for Premium on the theory that it shares.

The plan card promised expanded messages. What it delivered, four hours into a Tuesday, was a grey banner and a wait. Nothing on the page you paid from said how many messages you had, or when they came back. That is the shape of AI chatbot usage limits in 2026: the price is a number, the allowance is an adjective.

Why do AI chatbot usage limits stay unpublished?

Because an unpublished ceiling can move: vendors size capacity week to week, and a printed number becomes a promise they must honour or explain, while an adjective can be quietly re-tuned overnight.

Look at what OpenAI's pricing page commits to. Plus is sold as expanded messages and uploads, with "Limits apply" set as a link rather than a figure. Free is "unlimited text chats, subject to abuse guardrails". So, in almost identical words, is Pro. When the cheapest tier and the dearest carry the same qualifier, the qualifier has stopped meaning anything.

This is not new, and not confined to chat. It showed up in the AI browsers that promised to replace Chrome, and it runs through the Figma AI versus Adobe Firefly comparison as well: a monthly price, a vague noun, and the ceiling written where no buyer looks.

Google is the interesting middle case, or the frustrating one, depending on whether you are comparing or buying. Its subscription page publishes precise prices and deliberately imprecise allowances: every paid tier is a multiple of a free tier whose own number is never stated. The four figures below are the ones that decide whether a plan fits your month, and they come from Google's subscription page and GitHub's billing documentation, both read on 21 September 2026.

The refresh window is the figure people misread. A rolling reset sounds forgiving, because something comes back several times a day, but it sits under a weekly ceiling that does not roll. Spend hard on Monday and the window still opens on Thursday with nothing left to refill it. It is the design, not a bug, and it rewards flat workloads.

What twenty dollars a month actually buys

At the twenty dollar mark you are buying either a multiple of an unpublished number or nothing published at all, because the only vendor here that prints a countable allowance does not sell a tier at that price.

Two ladders, side by side. Every figure below comes from Google's subscription page or GitHub's billing documentation, except the break-even in row six, which is ours. OpenAI has no column because its plan cards carry no allowance figure to put in a cell.

That break-even is ours, not GitHub's, and it is the only upgrade decision here you can calculate rather than guess. Take the gap between the two Copilot tiers, divide by the published overage rate, and you land near 1,025 requests a month. Under that line, pay the overflow. Over it, upgrading pays for itself.

Do AI plan limits reset daily or weekly?

Both, and that is the problem: Google refreshes on a rolling window that sits inside a weekly cap, GitHub resets on your monthly billing date, and OpenAI publishes no reset schedule you could plan a working week around.

There is a second catch buried in the Copilot figures. GitHub's billing documentation scopes those published request counts to subscribers on an existing annual plan who stayed on legacy premium-request billing after 1 June 2026. The count is real and checkable. It is also grandfathered, so a buyer signing up today may not be on that plan.

My own read, and this is a stance rather than a finding: the vague multiplier is less a transparency failure than a capacity hedge. A vendor that cannot predict its own inference costs will not print a ceiling it may have to defend. Understandable. It still leaves the buyer holding the uncertainty, the same trade as when courts cleared AI shopping agents to buy on your behalf: the capability shipped, the accountability did not.

• A weekly ceiling under a rolling reset means a heavy Monday can cost you Thursday.
• A multiple of a base that quietly shrinks is a cut nobody has to announce.
• Check which plan your signup date put you on, not the one the documentation describes.

So do this before your next billing date. Open the limits page your plan links to, write down the one number or multiplier it gives, and divide it by your heaviest week. If it will not divide, because there is no number, you have learned the most useful thing about that plan: you are renting an adjective, not buying an allowance. Decide on that, not on the plan card.

Related: why Microsoft 365 Family Copilot works only for the plan owner

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