Ori wrote: ↑Wed Aug 18, 2021 2:37 pm
JapaneseMike wrote: ↑Wed Aug 18, 2021 12:58 pm
It's a good point actually, and worth looking into - but one clarification is that the cost for the mortgage insurance doesn't stay the same though. It's +0.2% (or whatever), but that's applied to your outstanding mortgage balance.
So additional annual 0.2% on 40mil outstanding vs 10mil outstanding is 80,000 vs 20,000 right?
Depends on the kind of loan, I guess.
In case of 元利均等返済, interest is paid off first, and monthly payments stay the same during the whole loan duration.
In case of 元金均等返済, both principal and interest are paid off simultaneously (if I understood correctly), so payments decrease over time.
In the latter case, we can say that mortgage insurance decreases overtime. However it seems, that many (most?) banks allow only 元利均等返済.
https://www.rakuten-bank.co.jp/home-loa ... ethod.html
I hadn't considered that point, but logically unless you're paying interest only mortgage (they used to have these in US/Europe before the crash in 2008, not sure if they still exist) then your principal will decrease over the life time of the mortgage so you can eventually pay the whole thing off
So, this is just a back of the envelope calculation and it's late, so if I've made an incorrect assumptions, please correct me.
Using the previous 40mmilloan example, and let's assume a 1% interest rate mortgage, plus additional 0.2% for the insurance/cover.
So after month one, you've got 1.2% interest on 40mil yen which is 480,000 / 12 (since only 1 month worth of interest) so you've only got 40,000 interest to pay in total. If your payment is 120,000 a month you're paying off 80,000 worth of principal. Now, you're paying the same amount every month, so next month you'll have a principal of 39.920,000 which will accrue 479,040 / 12 = 39,920, meaning you'll be paying off 80,080 worth of principal. So, fast forward 30 years and your interest (and therefore insurance premiums) will continue to drop.