Northland's largest tertiary provider ran $1.25 million over budget last year due to reduced government funding and falling short on enrolment targets.
NorthTec chief executive Paul Binney said while they had a deficit for the first time since 2008, the quality of education was not compromised.
"The message is, yes, it's unfortunate but in the long-run scheme of things, we don't think it's a big issue," Mr Binney said.
The $451,000 deficit was revealed in the polytechnic's annual report for 2014, tabled in parliament earlier this month. NorthTec had planned for a $800,000 surplus.
A combination of factors led to the deficit, Mr Binney said. These included a decline in government funding, lower than anticipated enrolments, a high number of young people not engaged in education and the region's geographic make-up.