The New Zealand dollar jumped more than 1 US cent after the Federal Reserve unexpectedly chose not to start tapering its US$85 billion a month monetary stimulus programme this month, citing strains in the US economy.
The kiwi rose to a four-month high of 83.75 US cents, and was trading at 83.64 cents at 8am in Wellington, from 82.25 cents at the 5pm market close yesterday. The trade-weighted index rose to 77.61 from 77.01 yesterday.
The US dollar index, which measures the greenback against a basket of currencies, slumped after the Fed said it would continue its stimulus programme as it awaited evidence of a more stable economy to start trimming the purchases. Most market watchers had expected the Fed to start reducing the asset purchases by at least US$10 billion this month, which would have supported the US dollar.
"The kiwi is going to keep outperforming," said Mike Jones, currency strategist at Bank of New Zealand. "A sliding US dollar floats all boats, but the kiwi is probably going to float more than most.
The New Zealand dollar had gained ahead of this morning's decision, released at 6am local time, as investors were lured by higher local interest rates and buoyant commodity prices.