That’s fine but the key point I was making is that the amount of your payment is fixed (typically). Unless you pay additional principal up-front on your own, the amount you owe decreases very slowly at first. That accelerates as time goes on because your payment stays the same but more of it is going towards principal each month.
When talking about building equity in home value, there are two ways: growth in real estate value, and amount you paid into principal. The latter is much more effective towards the end of a loan.
That is incorrect. Making payments on the principal is much more effective early on, because of compounding interest. Here is an example:
Say you have a starting with $100k owing, at 6% per annum, and monthly payments. So the first payment will have accrued $500 interest that you must pay. Say your payments are then set to $600 for “maximum affordability”.
The balance owing at the end of each month will go something like this (with a bit of rounding):
Month 0: 100,000 → interest is $500
Month 1: 99,900 → interest is $499.50
Month 2: 99,800 → interest is $499
Month 3: 99,700 → interest is $498.50
…
Month 12: 98,200 → interest is $494.10
In one year, you will have spent $7200 and paid off just over one percent of the principal. So you’re making progress but it’s really slow.
At the end of the mortgage term, if you cough up $1200 all at once then it will take two months off your mortgage payback period.
However, if you were able to pay $1200 extra toward your mortgage in the first year, you would basically double the amount of principal you paid back in that year, and you would take nearly an entire year off the remaining payback period.
When we had a mortgage, most Canadian bank mortgages let you pay up to 20% of the principal per year (usually in a one-time lump sum), and you could increase the payment by up to 20% per period as well. The earlier you could do such a thing, the more money you saved in interest paid.
The benefit of this strategy is different depending on whether the interest portion of your mortgage payment is tax deductible. In Canada, it is not, unless it’s an investment property (i.e. not your principal residence).