New Zealand experienced a very sharp rise in house prices and interest rates rose to almost 10%. This was followed by an explosive period of consumer price and wage inflation at the same time as flattish house prices in nominal terms.
We found the average pre-tax income in June 1975 was NZ$126.88 a week. After tax of 22% that left disposable income of NZ$98.97 a week. The average house price in 1975 was NZ$24,300. Assuming a 33% deposit on a 15 year mortgage and the 9.3% variable rate at the time meant an average wage earner had to make a mortgage payment of NZ$38 a week or about 39.2% of disposable income.
This relative unaffordability didn't last long because wage inflation combined with falling real house prices through the late 1970s and early 1980s reduced the portion of disposable income required to buy a house.
Back in 1987 - 18.4% 67% of income
There was also a housing boom back in 1987 as Alan Greenspan took the reins and cut global interest rates to prevent the 1987 stock market crash widening. Our stock market crashed anyway, but we did have a housing boom that lasted for another year or so.
At the same time our interest rates were sky-high to clamp down on inflation which had rampaged through the 1970s and 1980s. The chart above shows the spike in real prices and then the relative decline, despite a blip up in the late 1980s. Real house prices did not recover to their 1975 highs until 1996, thanks to inflation.
Back in 1987 the average house price was NZ$88,900. The average pre-tax income was NZ$485.98 a week and the average take home pay was NZ$365.41. Again, assuming a 33% deposit and a 15 year loan, the mortgage payment of NZ$67.39 NZ$246 a week works out at 18.4% 67.4% of take-home pay. That is even with interest rates at 20.5% as they were at the time.
That proportion quickly fell as interest rates fell to more normal levels in the early 1990s and house prices stagnated.
Fast forward to 2007-09 - 60% to 80% of income
Between 2002 and late 2007 house prices in New Zealand virtually doubled during a period of low inflation. They exploded in real terms as the chart above shows. Alan Greenspan was well entrenched with his low interest rates policy and a new higher tax threshold in New Zealand encouraged much borrowing to buy rental property.
Assuming the same 33% deposit and 15 year home loan, a person on the median income buying the median house now would be receiving NZ$734 after tax and paying NZ$449 in mortgage payments or 61.2% of disposable income.
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