They also want every school to make at least one teacher a deputy head and to pay them accordingly.
The National Association of Head Teachers and the Secondary Heads Association claimed that the number of heads retiring sick has soared. They added that teachers now saw management jobs as demanding, underpaid and, in the case of deputies, insecure.
Differentials were inadequate with the highest-paid teachers in medium to large primaries and small to medium secondary schools earning between 91 per cent and 96 per cent of deputy heads' salaries.
The NAHT and SHA said heads and deputies' salaries continued to fall behind those of managers in comparable posts in both the public and private sectors.