Example output: Mortgage: $150000.00 Annual rate: 4.500% Mortgage term: 30 years Regular monthly payment: $760.03 Year 1 Total pay Interests Principal Mortgage Mon. Ins. Extra Yr. Ins. 09/2014: 760.03 562.50 197.53 149802.47 562.50 10/2014: 1520.06 1124.27 395.80 149604.20 561.76 11/2014: 2480.09 1685.28 794.81 149205.19 561.02 200 12/2014: 3340.12 2244.80 1095.33 148904.67 559.52 100 2244.80 Year 2 Total pay Interests Principal Mortgage Mon. Ins. Extra Yr. Ins. 01/2015: 4100.16 2803.19 1296.97 148703.03 558.39 02/2015: 4960.19 3360.83 1599.36 148400.64 557.64 100 03/2015: 5720.22 3917.33 1802.89 148197.11 556.50 04/2015: 6630.25 4473.06 2157.19 147842.81 555.74 150 05/2015: 7540.28 5027.47 2512.81 147487.19 554.41 150 06/2015: 8450.31 5580.55 2869.77 147130.23 553.08 150 07/2015: 9360.34 6132.28 3228.06 146771.94 551.74 150 08/2015: 10270.37 6682.67 3587.70 146412.30 550.39 150 09/2015: 11180.41 7231.72 3948.69 146051.31 549.05 150 10/2015: 12090.44 7779.41 4311.03 145688.97 547.69 150 11/2015: 13000.47 8325.73 4674.73 145325.27 546.33 150 12/2015: 13910.50 8870.70 5039.80 144960.20 544.97 150 6625.91 ...The second column (Total pay) is the total payment, so far, which includes the interests (the third column) and the principal (the fourth column). The fifth column (Mortgage) is the remaining mortgage/loan. The sixth column (Mon. Ins.) is the amount of the interests part in the current monthly payment. The seventh column (Extra) is extra amount of pricinpal you may include in your monthly payments. The last column (Yr. Ins.) is the total amount of the interests paid for the current year. Note that the year is defined as the calendar year, so the first year is not full if the month of the first payment is not January.