The govts objective with FHOG is to temporarily support the housing market in order to maintain the 'wealth effect', ensure that the main investment for retirement maintains its value and to prevent a deflationary spiral.
The govt doesn't really care all that much about individuals, it cares about the vast majority. And it's currently achieving its objective - minor price falls in some areas, big drops from v. lofty heights for a tiny minority.... and most people still happy.
It doesn't really matter if it's demand brought forward or pent-up demand being fulfilled. The govt is likely to continue with its support for the bottom end for as long as necessary. When confidence returns, it will withdraw FHOG support. It currently has a deadline to encourage FHB to buy NOW, if there was no deadline there's not much reason to buy now. It's likely the deadline will be extended for another 6 months if^H^Hwhen things continue to look grim.
The RBA is trying to engineer a similar outcome - it's objective is to control inflation & ensure growth - and low IRs is its only tool. When confidence returns, it will raise IRs. Those FHBs who buy now assuming that low IRs are the norm, may suffer if they don't fix rates or get reasonable wage increases. Even if they become forced sellers the rest of the (generally confident) population is likely to ensure prices don't fall.
An acquaintance just bought a house for $340K, he got $14K FHOG & paid no stamp duty. He's borrowing 95% ($323K), paying $2000 LMI I guess and $1000 legals.
So $17K deposit plus expenses is $20K, less $14K FHOG means he needs just $6K cash to buy it.
And to service the P&I loan over 25 yrs it will cost him $486pw (at 6%). I'd guess they take home around $52Kpa and currently rent for around $360pw. If he chose to fix for 15 yrs (Commbank 15yr rate today is 6.84%) it would cost him an extra $40pw. If rates go down to 5% next month (as many expect) then it'll cost him $440pw - less than $80 more than his current rent.
I'd say those figures are enough to cause a lot of FHB to support the market. Would've been nice to have that sort of help to buy my first property... but like most here, had to do it the hard way
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So to answer the original question.... I feel prices at the bottom are likely to be supported regardless of falls in rates, tho they probably won't rise until general sentiment improves. And the middle bands won't move much either until sentiment does improve - most people will sit tight unless they are forced sellers. As unemp rises there will be some forced sellers. The upper bands are likely to see more price falls.