THE Conservatives have claimed uncertainty over details of the replacement for stamp duty could delay or scare off major investment in Scotland.

Details of the rates and bands to replace the tax will not be outlined until after the independence referendum in September next year, Finance Secretary John Swinney confirmed yesterday.

The replacement for the current system, where most householders pay upwards of 1% in stamp duty on the purchase price of their new home, will be replaced from April 2015.

Conservative finance spokesman Gavin Brown, whose party backs the scheme in principle, questioned the timing of the tax announcement.

He said: "There are real worries this will cause uncertainty, and could delay or scare off major investment in Scotland. We want to see this announcement moved forward significantly to avoid that scenario in keeping with the clear evidence given to the Finance Committee."

House-buyers currently pay 3% on the price of a property valued between £250,000 and £500,000, but only 1% on those bought at between £125,000 and £250,000. The percentage paid at the time of the purchase is higher for more expensive homes. A key part of the new system is that only the proportion of the price above the threshold will be liable for the higher rate of tax. Mr Swinney said the new system put forward "signals a move away from the UK Government's slab tax approach to stamp duty land tax which distorts the market".

He added: "We are proposing a progressive system of taxation where the amount paid is more closely related to the value of the property, and therefore to the ability of the individual to pay. This approach has been warmly welcomed by tax professionals and others during the public consultation."

Mr Swinney said he had still to reach a conclusion on when to announce the rates and tax bands, but that it would not be any earlier than September 2014, and he may wait until closer to April 2015.

Responsibility for the tax on land and property sales was devolved to Holyrood as part of the Scotland Act 2012.