'Difficult to give certainty to schools on finances'published at 10:56 British Summer Time 26 October 2016
It is "very difficult" for the Department of Education to give "certainty to schools" on what money they will have available on a long-term basis, Mr Connolly says.
That is because the next budget will only cover one financial year.
"It's much easier for us to know how to plan things when you have the funding allocation for the next three years," Mr Connolly adds.
"Unfortunately, due to the circumstances we're in post-Brexit, we're going to have a one-year 2017-18 [budget], followed by a two-year budget."