Mr Joyce froze the parental income threshold in March this year, saying it had increased well ahead of wage growth and inflation.
The freeze was expected to affect about 1,500 students who would have been eligible for a partial allowance if the threshold had increased.
The Government has also already indicated further changes to the student loan scheme.
It has promised to keep interest free student loans in place for borrowers who lived in New Zealand, but has already increased payment requirements for overseas borrowers and has indicated further changes are possible to eligibility.
Under the current rules, students qualify for a full student allowance if their parents' combined income is lower than $55,026. It abates above that up to $83,449.01 for students who live at home, or $90,554.74 for students who do not live at home.
Partners' income is also tested - students and/or their partners can earn up to $206.73 before tax before their allowances start to abate.