I want to change my code from The first day of each month to the last day
Please any help................Bob

SELECT qOwnerPercentAmountInPaymentMethodAll.OwnerID,
Sum(qOwnerPercentAmountInPaymentMethodAll.AmountSummary) AS Dues,
IIf((Date()-[ondate])/30>=3,3,IIf((Date()-[ondate])/30>=2,2,IIf((Date()-[ondate])/30>=1,1,0)))
AS MD
FROM qOwnerPercentAmountInPaymentMethodAll
GROUP BY qOwnerPercentAmountInPaymentMethodAll.OwnerID,
IIf((Date()-[ondate])/30>=3,3,IIf((Date()-[ondate])/30>=2,2,IIf((Date()-[ondate])/30>=1,1,0)));