If you're looking to switch between monthly and annual billing for your current Microsoft 365 subscription plan, do the following:
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Sign in to Services & subscriptions with the Microsoft account associated with your Office subscription.
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Under your Microsoft 365 subscription, click the Payment & billing tab.
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Click Change, and then select Switch plan.
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Choose the monthly or annual billing frequency for your plan.
Note: If you can't find your Microsoft 365 subscription it's probably associated with another Microsoft account. Sign out and then sign in with that other account.
