The bank’s annual survey of around 900 people who took out a mortgage over the past year showed that 41 per cent submitted loan applications that were not completely factually accurate — so-called “liar loans”.

That is a record high in the seven years UBS has collected this data, up from 38 per cent last year and 27 per cent back when the survey started in 2015.

It is noticeable that there was a brief dip during the banking royal commission hearings in 2018, at a time when the banking and financial regulators were also cracking down on risky lending.

While the majority of those who fudged the figures said their applications were “mostly factual and accurate”, just under a third of those who lied to their bank said their application was only “partially factual and accurate”, holding at a record high.

The most common areas of inaccuracy were under-representing living costs (34 per cent), under-representing financial commitments (28 per cent) and over-representing income (22 per cent).

Worryingly, the size of the misrepresentations also went up in 2021.

Of those who overstated income, 36 per cent did so by more than a quarter.

Likewise, 39 per cent of those understating living costs did so by more than 15 per cent.

UBS said the rising risk of home lending fuelling the current property boom was best captured in a record rise in “very high” debt-to-income mortgages — where the borrower owes at least six times what they earn each year — to 21.5 per cent of loans.

“Amid home prices booming 18.3 per cent year-on-year (highest since 1989), we think borrowers are ‘chasing the market’ and stretching towards their capacity limit to be able to qualify,” the report said.

This has been aided by a reduction in the interest rate at which loan applications are being assessed, which is now around 2.5 percentage points above actual mortgage rates, down from more than 3 when tougher so-called macroprudential lending rules were last in place.

As with previous UBS liar loan surveys, borrowers who used mortgage brokers were far more likely to submit inaccurate applications (44 per cent) versus those who applied directly through a bank (29 per cent).

In the vast majority of those cases, borrowers said the mortgage broker advised them to falsify their application.

Property investors were also more likely to falsify their loan applications (at 53 per cent with one investment property and 57 per cent for those with two) versus owner-occupiers (31 per cent).

Buyers of rural and regional property were also more likely to have falsified loan applications, which was a new trend in 2021, perhaps as the level of sea and tree-changing increased.

Regulator plays down home loan fears

The same morning UBS released its latest findings, banking regulator APRA appeared before the House of Representatives Economics Committee with a very different message.

“The issue of concern at present is that there is an increase in high debt-to-income lending, but it’s offset against a number of other metrics which are going in a more positive direction from a macroprudential perspective,” APRA chair Wayne Byres said.

Mr Byres pointed to a decline in high loan-to-valuation ratio and interest-only loans…