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Banks posted record profits this year and benefited from higher margins after the central bank raised rates twice this year and are hoping for margin improvement in 2018, when more rate hikes are anticipated.

While the rate increases have pushed up yields on short-dated bonds, long-term yields have been heading in the other direction since October. That could reduce the profits that banks tend to make from using short-term funding, such as deposits, to lend to businesses and home owners over a longer time frame.

“If you get to a point where you have an inverted yield curve I definitely would be making the case that we should be limiting our exposure to the Canadian banks,” said Bryden Teich, portfolio manager at Avenue Investment Management.

When Canada’s curve last inverted in 2007, the economy pushed into recession and prompted the Bank of Canada to slash interest rates. The S&P/TSX Capped Financial Index plunged 60 per cent between May 2007 and February 2009.

“What we really want is for the five-year yield curve to go up, allowing for a greater contribution from our deposit base,” Royal Bank of Canada Chief Executive Officer Dave McKay told Reuters.

“As rates increase, we are able to recapture the margin compression that we’ve experienced in recent years as a result of declining rates.”

McKay added that RBC uses hedging to limit its risk.

In the fourth quarter of the 2017 financial year, four of Canada’s ‘Big Five’ banks – RBC, Toronto-Dominion Bank, Bank of Montreal and Canadian Imperial Bank of Commerce – improved their net interest margins by benefiting from rate hikes by the Bank of Canada in July and September.