Princess Mako and her boyfriend Kei Komuro are looking to register their marriage in October, a government source said Wednesday, more than three years since their wedding was abruptly postponed following reports of a money dispute involving Komuro's mother.

After submitting the legal papers, the 29-year-old princess is expected to leave her imperial residence and prepare for starting a new life in the United States, where Komuro, also 29, currently resides, according to the source.

Amid public unease about their marriage due to the financial dispute between Komuro's mother and her former fiance, the princess will likely decline a lump-sum payment of up to about ¥150 million ($1.36 million) that traditionally is given to female royal family members upon their departure from the household, another source has said earlier.