Excluding unruly pupils from school could cost city council taxpayers up to £3 million this year.
Education officials estimate that every single pupil permanently excluded from school drains between £5,000 and £10,000 from the Local Education Authority budget.
While there are legal and administration costs, the majority is spent on specialist education to turn around the pupil's behaviour.
The Evening Mail last week revealed that permanent exclusions have risen by more than 50 per cent in under two years as teachers get tough with bullies, vandals, thieves and yobs.
With 209 exclusions from the city's 74 schools during the first two terms of this year, it has already cost between £1 million and £2 million.
However, this is offset by a loss of £3,000 per pupil, per year to the school concerned.
The costs involved pay for places at special pupil referral units, where specialist staff work with small groups of pupils or even individuals to address their behaviour.
Other pupils receive individual treatment from education specialists before being returned to school.
The council's figures show that so far this year only five of the 209 pupils excluded between September 2004 and Easter 2005 were being kicked out of school for a second time.
An LEA spokeswoman said: "The cost of alternative education following exclusion varies depending on nature of provision, but will be approximately £5,000 to £10,000 per pupil per year.
"We aim to support pupils excluded through pupil referral units and individual programmes to address behaviour issues and return them to mainstream education successfully as soon as they are prepared."
The Evening Mail has repeatedly asked Birmingham's education chief, Coun Les Lawrence, to comment on the figures but so far he has not responded.
