The slump in house prices over the last 18 months has raised the spectre of some home owners falling into negative equity.
A home owner's equity is the amount of money they would be left with after they had paid off their mortgage.
So if they purchased a home for $1 million with a 20% deposit, their equity would initially be $200,000.
If the value of a home increases, that will increase the value of the owner's equity.
But if the value declines, the owner's equity reduces by the same amount, because the bank will still want to be repaid in full.
Negative equity occurs when a property's value has declined so much that the owner's equity is wiped out and more, meaning if the property was sold there would not be enough money from the sale to repay the mortgage in full, leaving both the home owner and their bank in a very difficult situation.
So how many home owners are at risk of being in that situation following the latest falls in property prices?
The first step in that equation is working out how many homes are likely to be worth less now than they were when their owners purchased them.
Real Estate Institute of New Zealand (REINZ) national median selling price data suggests most dwellings purchased between March 2021 and December 2022 will probably be worth less now than they were when they were purchased.
According to the REINZ, 136,609 residential properties were purchased over that period.
So there's potentially 136,609 homes that are now worth less than their owners paid of them.
Does that mean that all of those home owners are in negative equity?
Absolutely not.
That's because the national median selling price has only fallen by 14.6% from its peak of $925,000 in November 2021, to $790,000 in December 2022.
That's the maximum decline in value for someone who purchased at the November 2021 peak and it's not enough to wipe out the equity of anyone who purchased a property with a standard 20% deposit during that period.
Certainly their equity would have been reduced and in some cases it would have reduced substantially, but in most cases those home owners would still have some equity left.
Those who are at risk of being in negative equity are those who purchased their property between March 2021 and December 2022 with less than a 20% deposit.
According to the Reserve Bank, 12,946 low equity mortgages were approved between March 2021 and December 2022.
Exactly three quarters of those low equity mortgages were to first home buyers.
Those numbers suggest there's about 13,000 home owners that are potentially at risk of being in negative equity, which is 9.5% of the residential properties purchased between March 2021 and December 2022.
Even that number may be a bit on the high side - the actual number will depend on when they purchased in the current cycle and how big their deposit was.
While being in negative equity is not a good place to be, in practical terms it only becomes a problem if the home owner wants to sell, can't keep up with their mortgage payments, or wants to access additional credit.
So far, most appear to be weathering the storm.
Currently there are about 34 residential properties advertised for mortgagee sale throughout the country, and the number of mortgagee sales has remained relatively flat since the start of the year.
However if mortgage rates continue to rise and house prices continue to fall, the number of home owners getting into difficulties could start start to become a more serious problem.
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