Cuts to schools are "dire" and will affect support to the "most vulnerable children", according to a Belfast school principal.
Claire Robinson from Holy Evangelists' Primary School has written to parents urging them to fight budget cuts.
The school in Twinbrook has about 560 pupils, two-thirds of whom are entitled to free school meals.
There have been numerous cuts to support for children as the Department of Education tries to make savings.
Ms Robinson's intervention comes as the Children's Law Centre told Secretary of State Chris Heaton-Harris that it will take legal action unless he takes steps "to assess how to protect children from the cumulative effects of the budget cuts".
In her letter Ms Robinson said Holy Evangelist had a "huge cut" of about £100,000 to its budget for 2023-24, as the school had lost funding for a number of services.
"Every decision we make always has your children at the heart, but I do feel it is now vital that you know the reality we are facing," she told parents.