@pbaldy I got it with your is null.... Thank you!
SELECT tbluEmployees.EmployeeID, IIf([BoughtVac]=True,40,0) AS test, IIf([BoughtYear]=True,[BoughtYear],0) AS test2
FROM tbluEmployees LEFT JOIN tbluBoughtVacation ON tbluEmployees.EmployeeID = tbluBoughtVacation.EmployeeID
WHERE...