The result of cross-party talks on further devolution will be announced later.
Full control over income tax is likely to be handed over to Holyrood.
The Smith Commission was set up after pro-union parties promised greater powers for MSPs if Scots rejected independence.
Scottish secretary Alistair Carmichael is confident of an agreement:
Fife Conservative MSP Murdo Fraser supports devolving Air Passenger Duty and income tax:
Jim Murphy, Labour leadership candidate, recently announced he'd be in favour of Scotland being in control of it's own income tax affairs:
And Stewart Hosie, SNP deputy leader, wants as strong a Scottish parliament as possible:
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