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Scotland should control two-fifths of its own revenues with the power to raise taxes on the rich, according to Labour.
The party has unveiled the long-awaited findings of its Devolution Commission in Edinburgh.
The Scottish Parliament should raise around 40% of its own revenues, around £2 billion more than the most recent Scotland Act.
The Scotland Act will give Holyrood control over more tax raising powers in exchange for a 10p in the pound cut in the block grant, but Labour believes this should be extended to 15p - giving Scotland control of three quarters of the basic rate of income tax.
The leader of the Better Together campaign and former Labour Chancellor Alistair Darling said he was offering a "positive vision" for staying the UK.
On the day of the six-month countdown to the referendum, Mr Darling added that independence would bring "huge risks".
The Scottish Deputy First Minister Nicola Sturgeon has set out what she claims are six "compelling reasons" in favour of independence to mark the milestone that it's six months to the Scottish Referendum.
She argues an independent Scotland would create more jobs, spend tax revenues on "Scotland's priorities", protect public services, "guarantee we get governments we vote for", set up an oil fund and have a retirement age in line with Scotland's circumstances.
People in the Scottish Borders and Dumfries and Galloway will join fellow Scots in six months time to vote in the Scottish Independence Referendum.
Senior politicians and campaigners from both sides of the argument are holding events and debates in Scotland to look ahead to September 18.
Nationalists say the momentum is with the Yes campaign with half a year to go, but those who want to keep the union have warned that there will be no going back if Scotland crosses the line to independence.