Earlier this month an assessment by the Fiscal Council, an independent budget watchdog, concluded that the current funding model is not fit for purpose.
It added that resolving the issues will require getting new money from somewhere “even though this appears politically unpalatable”.
This week the NI Chamber of Commerce and others suggested that at least some of the money should come through the rates system.
Rates are a property tax levied on households and businesses and are the main tool which the NI Executive can use to raise money.
The NI Chamber report suggested a levy, of £100 on top of the current average annual rates bill of £1200.
It would be a proportionate levy meaning those with bigger existing bills would pay more than £100, and those with smaller bills would pay less.
The Chamber chief executive Suzanne Wylie appeared on The View, BBC NI’s main political discussion show, to sell the plan.
She got familiar responses from the political guests: households are already under pressure, so they can’t be the source of the additional money.
The Green Party suggested additional taxes on business.
The DUP said more efficiencies should be squeezed from NI Water, while the SDLP called for another review.
Meanwhile the Sinn Féin Infrastructure Minister, Liz Kimmins, is pressing ahead with a plan to raise money from housing developers.