Scotland to be given powers to raise more of its own tax and keep its funding formulaÂ Scotland will have powers over tax, welfare and transport policies The legislation will then be adopted by the UK Government after election By Alan Roden and Daniel Martin for the Daily Mail A revolution in British politics will be unveiled today, with Scotlandâ€™s parliament offered unprecedented power over tax, welfare and transport policies. Proposals from the Smith Commission, which was charged with planning further devolution following the referendum, will form the basis of draft laws due to be published in January. The legislation will then be adopted by the UK Government after Mayâ€™s General Election â€" regardless of who wins. When the proposals become law they will trigger Britainâ€™s biggest constitutional change since 1999. A revolution in British politics will be unveiled today, with Scotlandâ€™s parliament offered unprecedented power over tax, welfare and transport policies They are likely to mean members of the Scottish parliament will be responsible for raising around 50 per cent of the cash they spend on public services. Currently, control over council tax and business rates means the Scottish Government raises about 15 per cent of its Â£30billion budget, with the majority of public spending funded by a block grant from the UK Treasury. Controversially, Scottish MPs at Westminster will still be allowed to vote on the UK Chancellorâ€™s Budget, even though English MPs will have no say over tax affairs in Scotland. And the generous Barnett Formula that determines Scotlandâ€™s funding levels will be written into the deal. But there will also be cast-iron guarantees to ensure that decisions about certain policy areas, such as the state pension, will still be made in Westminster. The new settlement is set to include: Complete control of income tax, including the ability to determine new bands and increase rates; A share of VAT revenues from sales in Scotland, designed to encourage ministers to champion economic growth; Devolution of the Air Passenger Duty, which could slash the cost of holidays, and powers paving the way for ScotRail to be placed in public hands; The devolution of social security payments for the disabled and their carers as well as the Work Programme which helps the unemployed find jobs; A consultation on whether abortion law should be devolved, potentially paving the way for controversial changes to the 24-week limit; New powers allowing ministers to give 16 and 17-year-olds the vote and change Holyrood election dates. The Smith Commission proposals will also include some powers over energy policy, employment tribunals and health and safety law. But they will not go as far as the SNPâ€™s â€˜devo maxâ€™ proposal â€" dubbed â€˜independence by the back doorâ€™ â€" which would have seen Westminster stripped of nearly all powers except monetary policy, defence and foreign affairs. Office minister David Mundell said: â€˜We have made absolutely clear that draft legislation will be produced by January 25 next year Eleventh-hour talks focused on the devolution of housing benefit, but it is believed that power over the â€˜universal creditâ€™ welfare system, which combines six different types of benefits, will remain in Westminster. The finalised proposals were sent to the printers for publication at 8pm last night and are due to be revealed today. Speaking in the Commons yesterday, Scotland Office minister David Mundell said: â€˜We have made absolutely clear that draft legislation will be produced by January 25 next year, and there will be a commitment to enact that legislation in the next Parliament.â€™ However although the Smith Commission will today recommend that Scottish MPs should still be able to vote on UK budgets, it is expected that Mr Cameron will still push ahead with his pledge for English votes for English laws â€" a policy which has failed to attract much support from the Labour party. The Tories say it is unfair that Scottish MPs can vote on England-only matters but not vice versa. Last night some MPs were privately expressing the fear that by handing so much power to the Scottish Parliament, Westminster had made independence inevitable. A former minister said: â€˜We walked straight into the trap.â€™ And an MP said: â€˜I donâ€™t see how this doesnâ€™t lead to independence. I just canâ€™t see it going anywhere else.â€™