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13 December 2018, 15:04 | Updated: 13 December 2018, 15:06
Economists have said some higher rate taxpayers in Scotland could take home as little as 30p in the pound following decisions in the Scottish Government draft budget.
Finance Secretary Derek Mackay outlined the Scottish Government's draft tax and spending plans for 2019-20 on Wednesday.
These included freezing the threshold for the higher rate of income tax at £43,430, at odds with the rest of the UK, where it will increase to £50,000 from April.
This widens the tax gap for higher rate taxpayers from the existing difference in rates of 41p in Scotland compared to 40p elsewhere in the UK, introduced in last year's Scottish Government shake-up of income tax rates and bands.
Members of the Scottish Fiscal Commission predict the changes will lead to some higher rate taxpayers leaving Scotland or deter others from moving in, with the total behavioural changes expected to cost £6 million next year.
They pointed out the forecast reduction would involve small hundreds of taxpayers and freezing the threshold is expected to boost tax take by £68 million.
The commission's head of economy, income tax and VAT, David Stone, said: "We try to think about how it will affect behaviour.
"If you are currently sat at £45,000 and facing a 53% marginal tax rate, you put student loan repayments and pension contributions on that as well, you could be taking home as little as 30p in the pound.
"So the incentive to go for a promotion, work more hours it is going to have an effect in the income range and we've tried to capture that in our behavioural costing."
Commission chief executive John Ireland said: "We think that bigger gap will affect where people chose to locate over time, both people thinking of coming to Scotland and people living in Scotland who can either leave Scotland or change their residency.
"We think it will knock off about £6 million from income tax revenues."
Commission chairwoman Dame Susan Rice warned of the tight labour market in Scotland and said people might "think twice about coming to Scotland for a job".
The commission also forecasts the Scottish Government could have to pay back £472 million to the UK Government due to differences in the forecast between the block grant and devolved tax take.
It was stressed the number is volatile and could become positive in future years, leading to the UK Government having to pay more to Scotland to reconcile the difference.
Overall, the commission has improved its economic growth forecast for 2018 to a 1.4% rise in GDP from its 0.7% prediction in May.
Recent strong economic performance is credited for the increase, which in 2019 is predicted to be 1.2% rather than the May forecast of 0.8%.
Post-2020 this becomes more subdued, said to reflect forecast low productivity growth.