The personal details required would depend on the details of the system of local income tax that was proposed. However, it is difficult to see how any such system could operate without precise income data.
I do not think that that is widely understood. Members of the public would need to make their own judgment. Individuals are fairly sensitive about who shares knowledge of their income. Perhaps the fact that their local council would be a party to that information will cause people to weigh up and consider the implications of any change in the tax system.
Is not it the case that, under a local income tax, there would be no requirement for local authorities to know any individual's income? That would be a matter for the Inland Revenue. The only additional detail that would be required would be to ensure that everyone's postcode was attached to their address. I suspect that that is already the case for most people.
The SNP specialises in fantasy policies—once again, it has demonstrated that tendency. The idea that local authorities could, without knowing individuals' personal income data, levy a tax that would bring in the same income that they currently enjoy seems to me to be a fantastic notion.
Once again, we do not have precise data. However, if we take some of the projections from the Burt report, there is an indication that such a tax could cost hard-working families a bigger proportion of the money that is available to them.