If you have an Ireland version of QB online then from left hand vertical menu select Vat or tax and turn on to track Tax/vat.

Then you should be able to see under reports the vat summary or vat 3 report?

If this is correct what do you see as vat codes […]

Resolution for 'column header issue: 'I can’t set the tax rate for sales and purchase. what can I do?' available: Yes.

The column header issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the column header issue yourself by looking for a resolution described in the article. If it is a complex column header issue or you are unable to solve the issue, you may contact us by clicking here or by using other column header support options.

For more information about resolving issues related to column header in Quickbooks/QBO or to get support for the issue 'I can’t set the tax rate for sales and purchase. what can I do?', click the link below: