Scotland's biggest teachers union will take industrial action tomorrow after a new pay offer was dismissed as "insulting".
Employer Cosla made the fresh proposal which would have seen rises of up to nearly 7%.
It was an improvement on the previous offer of 5%, but still well below the 10% being sought.
The strike by members of the Educational Institute of Scotland (EIS) will lead to the closure of most schools in Scotland.
Education Secretary Shirley-Anne Somerville believed the offer was fair.
The BBC says that, under this latest proposal, teachers earning less than £40,107 would receive an extra £1,926 a year - equivalent to a 6.86% uplift for the lowest paid.
Those in the top two bands were being offered a 5% uplift, with those on £60,000 or more receiving no more than £3,000.
'Unaffordable' demand
Ahead of the new offer being made, the education secretary told the Scottish Parliament that the 10% demand by teacher representatives was "unaffordable" for the Scottish Government.
The EIS said its salaries committee unanimously rejected the offer in a special online meeting on Tuesday.
Its general secretary Andrea Bradley said it was a "divisive offer...which is actually worse for many teachers in promoted posts".
"Our members will see this offer for exactly what it is - a kick in the teeth from their employers and the Scottish Government," she added.
"This afternoon's salaries committee expressed outrage at this offer, and that outrage is sure to be replicated in staffrooms across Scotland.
"Our programme of strike action, which will commence as scheduled on Thursday, will clearly show the strength of feeling of Scotland's teachers who will be out in numbers and with strong voice on picket lines and at regional rallies."
A spokesman for the Scottish Secondary Teachers Association, which is planning a strike on December 7 and 8, described it as a "very disappointing offer".
'Not listening' to teachers
He added: ""This offer will not go down well with teachers and I would expect the planned strikes to go ahead. Maybe they will listen to parents and children, as they are not listening to teachers."
Meanwhile a third teachers' union - the NASUWT - says its members have voted for strike action on December 7 and 8.
They will take action short of strike action from December 9, refusing to cover for absent colleagues and attending no more than one meeting per week outside pupil sessions.
Mike Corbett, the union's national official Scotland, said: "Our members are angry, demoralised and have had enough.
"They are sick of being expected to put up with declining wages while working ever harder to meet the increasing challenges being faced in our schools. They are facing increasing financial hardship, with more teachers having to cut back on basic necessities."