can i pay subscription for 12months upfront for a client?. The system is only allowing monthly

Your inability to pay for your client's subscription annually is due to a specific factor, Evans.
 

For existing QuickBooks Online (QBO) accounts transferred to your billing management, only the monthly payment method is available. The annual billing option is limited to newly created client accounts only that have recently migrated to your wholesale plan.
 

To successfully manage the client's QBO subscription, you'll need to continue with the monthly billing cycle. To gather more insights about this, check out this link: Transfer clients to your wholesale discount plan in QuickBooks Online.

I'm also attaching an article that can help you supervise your client's data through your QBOA account: Manage clients in QuickBooks Online Accountant.

If you have further questions about managing your client's QBO billing, notify us by replying to this thread.