Durham are expected to post accounts showing a near £2m loss for the 12 months up to September 2012.
The county did not stage a Test in 2012, relying on one-day international tickets sales for extra revenue.
"Provincial Test grounds in those years without a Test usually lose between £2m to £4m." Durham chief executive David Harker told BBC Look North.
This summer's Ashes Test in August against Australia at Chester-le-Street is likely to reduce the losses in 2013.
New seating has been installed to
"We anticipate the best part of £20m in terms of cash generated for the region," said Harker.
However despite the influx of funds, the Test match will only reduce losses rather than turning in a profit.