Hi Guys, thanks for your help. I found simply adding distinct has done the trick
Select distinct EPSAgedBalances.dbPatID, EPSAgedBalances.dbPatFirstName, EPSAgedBalances.dbPatLastName,
EPSAllContracts.dbStaffLastName, EPSAgedBalances.TotTot
from EPSAgedBalances, EPSAllContracts
where EPSAllContracts.dbPatID = EPSAgedBalances.dbPatID
and TotTot < 0
thanks