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.
13 arrested in drink-drive campaign
Laxey road shut until January
Former Motor Museum goes on the market
No Onchan Park plan, say commissioners
Laxey campsite to get campervan improvements
Local authority: don't suffer in silence at Xmas
Government reminder over salt bins
Weather warning in place for high tides