The Balance Before Payment field (BalBeforePay_cc) is equal to the BalAfterPay field from the prior month. Thus, I linked the table to itself by YearMonth to YearMonMin1 and then pulled the previous month in. It worked. However, for the same current month, when I try to subtract the Mort + MisAdjust fields from BalBeforePay_cc in order to get BalafterPay, the BalAfterPay field shows a ?, presumably because you cannot calc an unstored field. How would you solve this problem. Thanks. See attachment.