QUOTE(gspirit01 @ Dec 23 2013, 04:09 PM)
%interest--Tenure-- yr installement-- mo Installments-- Interest Paid Yr 1
4.50%-- 40 yrs-- $53,947.54-- $4,495.63-- $44,813.13
5.50%-- 40 yrs-- $61,892.43-- $5,157.70-- $54,823.57
Difference-- $7,944.89-- $662.07-- $10,010.44
%interest--Tenure-- yr installement-- mo Installments-- Interest Paid Yr 1
4.50%-- 40 yrs-- $53,947.54-- $4,495.63-- $44,813.13
7.50%-- 40 yrs-- $78,968.49-- $6,580.71-- $74,860.70
Difference-- $25,020.95-- $2,085.08 -- $30,047.57
Actually, it is not just cash flow that an experienced investor would consider. By having to increase the sale prices due to interest payment increase, the risks to profit, and loan commitment just went up. Considering the affordability of potential house buyers for own use, investor will just have to go for cheaper units. House buyers have to pay loan just like investors.
No dispute that interest increase is bad for investor. In fact even a fool knows interest rate increase is bad

But the discussion here is actually on flippers and their dead chicken. Let me recap
Someone here was talking about everyone is waiting to pick up dead chicken in the near future. I was saying that we need an economic crisis to be able to see that. But icemanfx was saying that a 3% interest rate increase will be enough to allow us to pick up dead chicken. That is because there are a lot of flippers who cannot service installment with 3% increase in interest rates and hence they have to do fire sale. I was asking him how much is the effect in monetary terms that we have a lot of dead chicken to pick up. And he was calculating using RM1m x 1% = RM10k. That is RM800+ per month extra for every 1% increase. However, as you calculated above, housing loan is not based on straight line. And it turns out to be only RM600+ per month extra using reducing balance method.
As you have calculated, the interest portion for Year 1 is similar for both straight line method and reducing balance method. Because the principal is not much different in the initial years. However, the effect of interest will be a lot different in the future years because the principal is reduced. In fact the total difference will be the difference of the monthly installment x number of months, which is substantial (The rule of thumb of the difference between straight line and reducing balance is about 1.9 times, or about half of straight line method)
As I have said, flippers (not long term investors) are looking only on cashflows and all they are concern is whether they can service their monthly installments. If they can still service the installment despite the increase in interest rates, then there will not be dead chicken on the street. If they can't service, then they have to sell and we are waiting to pick up those dead chicken. How much interest rate increase is enough to force the flippers to sell their dead chicken ? icemanfx's expectation is 3%. However, as 3% increase in interest expense based on straight line does not equal to the increase installment payment based on reducing balance method, hence we may need to increase icemanfx's expectation to >3% interest rates increase in order to allow us to find a lot of good deals.
Actually everyone here is waiting for the dead chicken. I hope 2% interest increase will be enough to force the flippers to let go at 20% discount price