I am trying to update my payment information however i dont have a "billing and subscriptions" tab in my account settings .

It's good to see you here in the Community, @Nwannia.

There are some possible reasons and solutions you can perform to resolve the missing Billing & Subscription tab. Here is the list of them:

• You purchased the program via iPhone, iTunes, Android, or Google Play Store. To update the billing information, you'll have to go to your phone settings or Google Play Store.
• Your access is set up as a standard user. Reach out to your Master Admin to change your access rights. Please have him follow the steps on how to change your permissions through this article: Add, Delete, or Change User Access. 
• Your browser had data issues that caused QuickBooks to act weirdly. To get this fixed, you'll have to clear the browser's cache so the system can start fresh. 

If you get the same result, I recommend reaching out to our QuickBooks Support Team. This way, they can further look into this matter and help you update your billing information for your QuickBooks subscription.

You might also want to switch your billing schedule. This article will guide you through the steps: Manage billing, payment, and subscription info in QuickBooks Online.

Should you need any additional assistance while managing your billing information, you can leave a comment below. I'll be sure to get back to you, @Nwannia.