The finance secretary has shown "contempt" for the Scottish Parliament over his handling of the budget timetable, opposition MSPs have said.

Derek Mackay came under pressure to present "scenario plans" for his first Scottish budget before the end of Holyrood's October recess.

Opposition parties and the finance committee say the plans are needed to allow proper scrutiny of the Scottish Government's financial proposals for 2017/18.

The draft budget is normally published in September but is being delayed until December 15.

Mackay said uncertainty caused by the Brexit vote alongside Holyrood's new financial powers mean he will need to wait for the Chancellor's autumn statement on November 23 before he can bring forward his own draft budget.

During a Holyrood debate on the timetabling issue, finance committee convener Bruce Crawford acknowledged the finance secretary faces "a significant challenge" but said his committee "remains concerned at the amount of time which will be available for parliamentary scrutiny."

Crawford, who is SNP MSP for Stirling, noted a commitment made to the committee last month in which Mr Mackay said he was "willing to produce as much scenario planning information as I can".

He said it was "unacceptable" he had indicated he was no longer prepared to do so.

A motion lodged by Green finance spokesman Patrick Harvie calling for scenario plans to be presented has the support of 64 opposition MSPs, meaning a majority of parliament has backed the call for the government to act.

Scottish Labour leader Kezia Dugdale said: "Derek Mackay's decision not to publish the draft budget until December will severely limit the ability of the parliament's committees to scrutinise the budget properly.

"In addition, by refusing to publish as much information as possible in advance of the publication of the draft budget later this year, Derek Mackay is treating this parliament with contempt, particularly since he is going back on a promise that he has previously made to this Parliament."

Dugdale said she recognised it was "unreasonable" to expect the government to provide absolute figures, adding: "What we are asking for is indicative figures, the ability to look at different scenarios, that's all that we're calling for today."

Conservative finance spokesman Murdo Fraser said: "There's a very simple way for the Scottish Government to resolve this issue to the satisfaction of parliament, and that is for the Cabinet secretary to keep his word to the Finance Committee.

"To do otherwise, frankly, is to show contempt both for the work of this parliament and the finance committee."

Harvie said the MSPs could have pushed the motion to a vote but instead had "bent over backwards" to give Mackay alternative options.

He asked: "Is he not going to say anything ... to go further than he has gone so far and allow parliament to do its job in budget scrutiny?"

Mackay said: "I will honour the commitment I have given to the finance committee around sharing as much information as I possibly can.

"But I can't produce a scenario plan that's a spending budget, a draft budget, without having all the information that will come from the Chancellor's autumn statement.

"I will continue to work constructively with the finance committee and share as much information as I can to give as much certainty as I can, but that doesn't mean we can produce a draft budget."