IT cost the Isle of Man Government more than £800,000 to stage last year's Manx Grand Prix Festival.
The Department of Economic Development has released figures showing how much the festival costs to stage, and how much return it delivers, as part of a comprehensive review of the event.
Costs to date for last year's event show that £834,166 was spent on the event which was around £15,000 more than 2010's event which cost £815,027.
These figures include the direct costs from the Manx Motor Cycle Club, Vintage Motor Cycle Club and the Classic and Two Day Trials Clubs.
Insurance, medical cover, awards and administrative costs are included in the total but the figures are net of entry fees, merchandising, trade sites, sponsorship and other event income.
The figures do not include government salaries for those people who work on the event or any shared costs that can be attributed to the TT Races such as course set up costs or marshals' equipment.
In addition the Department of Economic Development has highlighted that other government departments also have costs attributable to the Manx Grand Prix Festival including the Department of Health (£182,247), Home Affairs (£27,483) and Infrastructure (£80,145).
An additional £40,000 was also spent via a Treasury marketing initiatives fund application on advertising, tradeshows and photography and press trips in 2011.
The Department of Economic Development has said there has been an estimated 10 per cent increase in visitors to the Manx Grand Prix Festival in the last two years.
According to the department this has delivered a total spend of £5.9 million to the economy with a payback to Treasury, from addition spending generated tax revenues, of £630,000.
A spokesperson for the department added: "However the further circulation of funds generated by the Manx Grand Prix within the economy are estimated to add approximately £125,000 to this figure."
Colin Kniveton, the chief executive of the Department of Economic Development, said: "The costs of staging motorsport events on the Mountain Circuit have risen appreciably in recent years and this is reflected in the current deficit of approximately £369,000.
"The department is working closely with the Manx Grand Prix Festival stakeholders to review all aspects of the festival and the consultation process is ongoing.
"We remain committed to working with all relevant parties to bring about the changes necessary to secure the future of a second motorcycle event on the Mountain Circuit."
A spokesperson for the Manx Motor Cycle Club said: "We note that the Manx Grand Prix Festival is currently not making a net contribution to government.
"However we are pleased to note that the festival does produce an income of £5.9million to the Isle of Man economy.
"The volunteers of the Manx Motor Cycle Club will continue to work closely with the department and others to continue to grow the festival and thereby attract increased numbers of visitors."
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