Hello team-mcsbranding, thanks for reaching out to the Community
When creating a new tax code in QuickBooks Online, you can opt to create a new Tax rate (for VAT, which will post to your VAT return) or Custom tax (a tax percentage which you can post under a new tax agency).
If you need any further guidance on how to create the code, please contact your accountant or tax professional for support. If you don't already have an accountant, you can find a QuickBooks certified accountant near you on our online directory. :)