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Double-entry accounting: how to keep track of mortgage installments as expenses?
The best thing for you to do will be to start using the Cash Flow report instead of the Income and Expense report. Go to Reports -> Income and Expense -> Cash Flow Once the report is open, open the edit window and open the Accounts tab.  There, choose your various cash accounts (checking, saving, etc.).  In the General tab, choose the reporting period.  (And then save the report settings so you don't need to go hunting for your cash accounts each time.) GnuCash will display for you all the inflows and outflows of money, which appears to be what you really want. Though GnuCash doesn't present the Cash Flow in a way that matches United States accounting rules (with sections for operating, investing, and financial cash flows separated), it is certainly fine for your personal use. If you want the total payment to show up as one line on the Cash Flow report, you will need to book the accrual of interest and the payment to the mortgage bank as two separate entries. Normal entry for mortgage payments (which shows up as a line for mortgage and a line for interest on your Cash Flow): Pair of entries to make full mortgage payment show up as one line on Cash Flow: Entry #1:  Interest accrual Entry #2:  Full mortgage payment (Tested in GnuCash 2.6.1)