RE: Yearly payment for office 365 Business Essential

Hi Caritas, 

To change the payment frequency of your subscription from monthly to annually, you need to contact our billing support team and going through the purchasing process again.

For more information: https://support.office.com/en-in/article/Change-your-payment-method-for-Office-365-8652f539-3123-4a8f-b9bd-6aa2f0e0372d 

Moreover, you can also provide us with tenant information via the private message, so that we can help you. To protect your privacy, I have sent you a Private message. You can provide the information by replying to it. Here are the steps to access the PM: 

1. Go to your details on the upper-right corner of the forum.
2. Click Private messages.
3. Click the subject Information Request: of my private message.

Thanks,
Roger Shen