The Department of Education, Sport and Culture says it doesn't know how much supply teachers cost over the last five years.
A Freedom of Information request asked for the cost of supply teachers for primary and secondary schools.
The education department said supply teachers were paid between £28.52 an hour and £36.45 an hour,.
But it said it didn't have a total amount spent on supply teachers, and suggested the Cabinet Office might have the figure.
Gales put two ferry sailings at risk tonight
Should the Island throw a birthday party for Barry Gibb?
Warning issued over icy roads
High ground could see 4 inches of snow on Saturday night
Mountain Road unlikely to open before Monday
Yellow warning for freezing temperatures tonight
School bangers night called off
AK47 and Uzi handed in to police