Thanks for visiting us here today, @james.macey.
I have some information about your HMRC login credentials. The Government Gateway User ID and Government Gateway Password will depend on how you activated your MTD. If you've activated it as a reporting agent, then use your accountant's login. However, if it's not registered as a reporting agent, you'll want to use your client's HMRC login.
To check:
- Go to your Client account.
- Select Account and settings.
- Click Payroll. From there check your Gateway ID. It's the same ID with your payroll.
Please refer to this article for the step-by-step guide with screenshots on how to submit a VAT return in QuickBooks Online.
I'm also adding this link to help you along the way. And if you need help with other tasks in QBO, you can browse for specific topics here and look for responses that fit your concern.
Please let me know if you still have questions or concerns with taxes. I'm always here to help. Take care and stay safe.