A recent update by credit bureau Centrix shows the number of people with a mortgage larger than $1 million has increased 15 per cent year-on-year.

Meanwhile, more than 130,000 people now have a mortgage over $1m, according to the latest figures on the country's debt.

A recent update by credit bureau Centrix shows the number of people with a mortgage larger than $1 million has increased 15 per cent year-on-year.