The survey of more than 1,000 members working in schools found just four out of 10 support staff were given more pay for taking on extra responsibilities, even though two thirds had reported a change in their job content.
According to the union the problem lies with the interpretation of staff cover for lessons - which can be simply supervising a class during a teacher's absence, but could also include preparing, teaching and assessing a lesson.
The result, Unison says, is that skills and responsibilities in the classroom are often not rewarded and acknowledged.
Dave Prentis, general secretary of Unison, said: "We know support staff take on a far wider range of work and responsibilities. Most staff back the changes and can see the benefit of freeing up teachers' time, allowing them to concentrate on educating the children.
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