I am in the middle of QBO Plus subscription paid annually and there is some 7-month until next renewal. I wish to downgrade my subscription now, how the fee be calculated

Glad to have you here in the Community, Chan. Let me share information about downgrading your QuickBooks Online subscription.

With QuickBooks Online, you can change your plan at any time. However, two things can happen, you'll either be charged for the full rate of the new subscription and receive a prorated refund, or just the total amount that was already deducted by the remaining months.

Before you downgrade, make sure you don't lose any necessary features. Please note, that any discounts that may have been linked to your existing plan will be eliminated by the downgrade. Please know that there are some features will disable after the upgrade is completed. Refer to the steps set out in this section if you currently use any of these functions.

Whenever you're ready to downgrade, follow these steps:

1. Sign in to QuickBooks Online as a primary or company admin.
2. Go to the Gear icon and then Account and Settings.
3. Select the Billing & Subscription tab.
4. Make sure your payment info is up-to-date.
5. In the QuickBooks Online section, select Downgrade your plan
6. Review the available plans and then select Choose Plan.
7. Follow the on-screen steps to downgrade your plan.

For more details, check out this article. It includes steps on how to downgrade your plan and switch back to the previous one: Upgrade or downgrade your QuickBooks Online subscription.

On the other hand, reach out to our Customer Support Team and inquire about the total charges of your previous and new plans subscription. They can verify if you're qualified to get this offer. Please note that our live support is available Mondays through Fridays from 6:00 AM to 6:00 PM Pacific Time and Saturdays from 6:00 AM to 3:00 PM.

Here's how to contact us:

1. Sign in to your QuickBooks Online company.
2. Select Help (?).
3. Click either tab to get started: Assistant or Talk to Human.
4. Search Contact Us, then Start a chat with a support expert.

I'm adding this resource to help you decide which subscription level suits you best: Plans & Pricing.

Moreover, consider scanning this material to guide you on managing subscription and billing: Manage billing, payment, and subscription info in QuickBooks Online.

Feel free to update us in the thread if you have additional questions when managing your subscription or other related concerns in QuickBooks Online. We can always lend a hand.