If you’ve taken out a mortgage recently, you may have noticed on your mortgage statement that the interest charged each month is nearly equal to your monthly repayments. In the first few years of your mortgage repayment, interest makes up a very large part of the payment. In the example below, a mortgage of R750 000 at 10% interest rate would have a repayment of R86 851 per annum of which only R12 410 goes to reducing the capital amount.
As inroads are made into reducing the capital, so the amount of interest paid reduces, allowing more money to go towards settling capital so by year 10, R30 411 is going to capital and in the final year 95% of the payment goes to the capital portion.
R750 000 mortgage |
Repayment
per annum |
Interest at 10% pa |
Capital payment |
Year 1 |
R86 851 |
R74 441 |
R12 410 |
Year 5 |
R86 851 |
R68 368 |
R18 483 |
Year 10 |
R86 851 |
R56 440 |
R30 411 |
Year 20 |
R86 851 |
R4 527 |
R82 324 |
This is why paying a bit extra each month into your mortgage can be so powerful – because every extra rand goes to settling capital and therefore accelerating the reduction in interest paid.
The below graph illustrates various amortisation (payment) curves and the impacts on home owners depending on how much they’re paying into their mortgage each month.
This graph illustrates a loan of R 750 000 at an interest rate of 10% per annum over 240 months (20 years). The assumption is interest rate remains at 10% for the entire loan term.
Normal amort (blue line)
If you pay the minimum instalment amount, you’ll pay the mortgage off after 240 months. Over the period you would have paid R987 038 in interest alone.
Additional payments (green line)
If you pay an additional R500 per month, you’ll pay off the mortgage in 200 months (just under 17 years) and save R200 000 in interest payments.
Short payment (red line)
If you pay R500 less than required, or if you have erratic payments, you’ll still owe just under R400 000 on your home after 20 years.
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