Actually, I have found my answer in the meantime. Thank you for being willing to help.
This is what I used:
SELECT OD.CalYear, OD.[Employee Name], OD.ID, OD.WorkDate, OD.ContractNo, OD.TotalTaxableWages, OD.TotalTaxableWages
(SELECT Sum([TotalTaxableWages]) FROM qryWagesOnly WHERE [Employee...