Finance Minister Taro Aso announced the move today, saying he was prepared to explain the decision to the US side.
"The tariff will take effect automatically as the volume of the imported US frozen beef exceeded the quota set by law," Aso said, "So this is what has to be done."
The usual tariff rate for frozen beef imports is 38.5 per cent. Under World Trade Organization rules, Japan can introduce safeguard tariffs when imports rise more than 17 per cent year-on-year in any given quarter.
Relatively affordable "Aussie beef" is an increasingly popular feature of most supermarket meat sections.
The US and Australia account for 90 per cent of all imports of frozen beef, which is mostly used by beef bowl, hamburger and other fast food outlets.
The Finance Ministry reported 89,253 metric tons of frozen beef were imported so far this year. But frozen beef accounts for only about of fifth of Japan's total beef imports.