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ASB announced a number of additional mortgage rate cuts today, including dropping its two and three-year special rates by 20 basis points to 4.69 per cent and 4.79 per cent, respectively.
Its four-year special and standard rates have fallen 30 basis points to 4.99 per cent and 5.25 per cent.
ASB's five-year special and standard rates have been cut to 5.09 per cent and 5.35 per cent, respectively.
So far, the other major banks are yet to match ASB and BNZ's 4.35 per cent special.
ANZ has its one-year special rate set at 4.69 per cent, while Westpac has a two-year special of 4.69 per cent.
Asked whether ANZ would also match the 4.35 per cent rate, a spokesman said: "We have nothing to announce right now, but are keeping our rates under constant review."
And Westpac doesn't have any immediate plans to match the rate, according to a spokesman.
"We are open for business with competitive rates which we are constantly reviewing and encourage those interested in a mortgage to talk to one of our bankers," the Westpac spokesman said.
Massey University banking expert David Tripe said last week that mortgage rates could potentially fall below 4 per cent in the current cycle.
"If we see sub 4 per cent rates it will be because the economy has got somewhat grimmer," he said.