MURDO Fraser should apologise for suggesting the Finance Secretary was wrong about how much money Scotland will get in Barnett consequentials from the Chancellor’s summer statement, an MSP has said.

The Institute for Fiscal Studies (IFS) confirmed yesterday that the Scottish Government will receive just £21 million extra in Barnett consequentials, not hundreds of millions, from the spending package as Kate Forbes had said - despite Scottish Tories calling her claim “nonsense”.

Writing on Twitter the morning after Rishi Sunak’s summer statement, MSP Murdo Fraser posted: “Oh dear. On @BBCRadioScot #GMS Kate Forbes doubles down on the claim that Scotland benefits from just £21m from yesterday’s announcements - and quite rightly is taken to task by @BBCGaryR.”

The post, as well as a tweet from his party colleague Dean Lockhart insisting Forbes’s figures were “absolute nonsense”, are still live on the website.

SNP MSP Paul Wheelhouse replied to Fraser this morning to say: “Have you apologised to Kate, yet, Murdo for implying she was wrong, when you were the one in the wrong?”

The IFS findings have also been “embarrassing” for the chairman of Unionist forum These Islands, who wrote a blog post calling Forbes’s £21m figure “misleading and inaccurate”.

A tweet promoting the blog post “dissecting” the Finance Secretary’s take on Sunak’s spending package is still the pinned post on his Twitter profile.

READ MORE: Kevin Hague embarrassed as IFS finds Forbes was right about £21m

Writing in the IFS report, economist David Phillips explained exactly how much money is coming to Scotland as a result of the announcement.

He wrote: “When asked whether the Scottish Government would receive just £21m as a result of the Plan for Jobs as the Scottish Finance Minister has claimed, I said that I couldn’t see how you would arrive at such a number given the schemes just mentioned, as well as the stamp duty holiday for England and Northern Ireland. It would get much more.

“In a big-picture sense, this is correct: the Scottish Government will get far more than £21m. Because stamp duty is devolved to Scotland it will get much more than that to enable it to enact its own tax holiday or spend on other measures.

“Exactly how much is not yet clear – it will depend on updated forecasts and ultimately out-turns for stamp duty revenues in England and Northern Ireland. But initial estimates published by the OBR this week suggest it could amount to around £120m spread over this year and next.

He added: “And the Scottish Government has already said it will use the cash it receives to temporarily raise the threshold of its equivalent tax to £250,000 and provide £50m in extra support to first-time buyers.

READ MORE: Kate Forbes praised for figuring out phoney budget pledge to Holyrood

“But the Scottish Government won’t, as I initially presumed, get extra funding as a result of the Green Homes Grant or the full £40m it would if all of the money for traineeships and so on were new.

“Instead, apart from the stamp duty money, it will receive £21m – the figure quoted by the Scottish Finance Minister – as a result of the combination of the Plan for Jobs and the reductions in investment spending elsewhere that the Treasury is now expecting.”

Nicola Sturgeon praised Forbes for working out the real figure - proving the UK Government's £800m claim wrong - before the news came to light yesterday.

She tweeted: "It was @KateForbesMSP who figured it out, and pretty quickly too. And she was rounded on by Scot Tories claiming she was wrong. She wasn’t."