"This is going to cause them to reprioritise, as it's called, to be able to pay for it.
"If they haven't got the money, then I think the Government should tell them what they have to cut."
Health Minister Jonathan Coleman said through a spokeswoman that DHBs had known the pay rise had been coming for some time and "they have to make provision for it within their budgets".
Auckland DHB budgeted $4.2 million for nurses' latest collective agreement in the 2015/16 year - $800,000 short of the required sum. Counties Manukau DHB had a funding gap of $1.8 million.
Neither DHB would say yesterday where savings would be made to pay nurses' wages.
Nurses' pay deals were negotiated between a group of DHB chief executives and the New Zealand Nurses Organisation (NZNO).
NZNO's industrial adviser, Lesley Harry, said she was surprised at the shortfall because DHBs had been given a clear indication of what members sought in negotiations.
Under the latest agreement, nurses received a 2 per cent pay rise last year and a 2 per cent pay rise this year.
Ms Harry said hospitals needed to offer good wages to attract quality candidates.
Under the new terms, newly graduated nurses received $47,000 and senior nurses received $65,000.
"Hardly a highly paid workforce," she said.
The funding gap was just one small symptom of larger funding pressures in the health sector, she said.
DHBs have been asked to find $138 million in savings this financial year, and some have indicated they are cutting costs through staff vacancies which have not been filled.
Funding gap - nurses' pay
Auckland DHB
• Cost: $5million
• Budgeted 4.2 million
Counties Manukau DHB
• Cost: 3.8 million
• Budgeted: 2 million
Mid Central DHB
• Cost: $554,000
• Budgeted: $1.1 million
Lakes DHB
• Cost: $2.3 million
• Budgeted: $1.46 million