TOKYO, March 22 (Reuters) - The Japanese government plans to spend more than 2 trillion yen ($18.4 billion) on additional cash payouts to low-income households with children, Kyodo News reported on Monday. The government is set to approve the plan at a cabinet meeting on Tuesday, Kyodo said, without citing sources. ($1 = 108.6900 yen) (Reporting by Makiko Yamazaki; Editing by Toby Chopra)