These programs for graduate students differ from those for undergraduate students in areas such as household finances criteria and amounts paid monthly. Household finances criteria for undergraduate students are based on the income of the person who supports their family financially. However, the criteria are based on the income of the concerned student himself or herself (combined with the income of his or her spouse if the student is married) in case the student is a graduate student. There is also a repayment exemption program for graduate students receiving payments through Type 1 programs who accomplished particularly excellent achievements.
Please check details at the following website.
<Loan-type financial aid programs for graduate students offered by JASSO>