Auckland Mayor Wayne Brown may fail to get even a partial sale of airport shares across the line on Friday.
Councillor Lotu Fuli has proposed an 11-hour amendment, which would put off the sale of Auckland Airport shares.
The proposal would delay a potential sale until the council next considers its long term plan. The trade off would be taking on additional debt of $160 million - $60m more than Brown's proposal.
Rates would rise 6.7 percent.
But council chief financial officer Peter Gudsell has warned increasing debt may impact its credibility with funding partners.
For this reason, and others, council staff took the view during consultation debt should be used sparingly.