The executives of the ruling Democratic Party of Japan (DPJ) reached an agreement Wednesday on a bill to increase the country's sales tax rate after marathon talks within the party.

The move is expected to clear the way for a approval of the bill in Japanese Prime Minister Yoshihiko Noda's Cabinet, which planned to submit it to parliament on Friday.

The DPJ also steps up efforts to win support from its junior coalition partner, the People's New Party, in getting Cabinet consent.

Chief Cabinet Secretary Osamu Fujimura told local media on Tuesday that the Cabinet would adhere to its plan and get the bill approved Friday to double the sales tax to 10 percent.

Fujimura made the comments after nearly two weeks of meetings in the ruling party over the tax hike. The policymakers of the party were forced to revise the bill by adding a precondition that the sales tax could only be raised when the economy shows signs of improvement, due to fierce opposition.

Those who opposed the bill demanded that the tax increase should be implemented when the economy is recording nominal growth rate of 3 percent and a real growth rate of 2 percent.

The controversial bill aims to tackle the country's ballooning social security costs by raising the current 5 percent consumption tax in two stages, to 8 percent in 2014 and to 10 percent in 2015.