A Treasury record distributed instantly after today's Autumn Statement puts the "net money" expense of the credits at £1.5 billion over the initial four years of the framework.
The credits are booked to be accessible from 2016-17, while the legislature says the arrangement could build the quantities of understudies entering postgraduate study by around 10,000 a year.
The Treasury additionally clarified that the credits would be accessible just to understudies less than 30 years old, managing a hit to develop understudies.
The advances will be reimbursed "simultaneously" with undergrad advances – under which graduates reimburse their credits just on the off chance that they procure above £21,000 a year – as indicated by the Treasury report.
Furthermore, the Treasury likewise says that while it will "counsel" on the point of interest of the arrangements, "one route" to structure the postgraduate credits would be to have a loan fee of RPI in addition to 3 for each penny, repayable at 9 for every penny of income above £21,000.
The Department for Business, Innovation and Skills said that there will be "an open discussion to educate the nitty gritty configuration of the plan amid the initial couple of months of 2015".
Mr Osborne said in articulation in the House of Commons: "A year back, I canceled the subjective top on the aggregate number of students at our colleges. Today, I am going to reform the backing for our postgraduate understudies as well. As of recently there has been no monetary backing accessible, and the forthright expenses of postgraduate degrees stop brilliant understudies from poorer foundations.
"So today, over all controls, we will make government-sponsored understudy advances of up to £10,000 accessible, surprisingly, to every single youthful peopl undertaking postgrad graduate degrees."
By clarifying that the advances would be accessible over all subjects, Mr Osborne finished recommendations that subsidizing could be constrained to understudies in science, innovation, designing and arithmetic subjects – a suggestion that had been considered inside the legislature.
The Treasury archive refers to expanding interest for high-talented work and the requirement for social versatility as motivations to present a postgraduate credits framework.
"The credits are outlined so that, by and large, people will reimburse in full, in acknowledgment of the high private come back to people, however they will beat business rates. The legislature will counsel on the point of interest and will affirm the conveyance arrange," the Treasury says.
It includes that the arrangement is "required to advantage around 40,000 understudies, and empower around 10,000 more people to exploit the chance to embrace postgraduate concentrate every year".
Also, the Treasury proceeds: "To bolster understudies until these credits are set up, the Higher Education Funding Council for England will dispense £50 million in 2015-16 to colleges to offer bursaries on a match-supported premise. These will be £10,000 each and will advantage 10,000 understudies."
The Treasury's record puts the "net money" necessity of the postgraduate credits at £300 million in 2016-17, and at £425 million, £395 million and £365 million in the three years after.
