Question of the day: should we have an investment income surcharge

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As part of the Tax After Coronavirus (TACs) project I suggested yesterday that there should be an investment income surcharge of 15% on incomes for all those below the age of 60 (when retirement becomes more commonplace) of 15% on all investment income exceeding £2,000 a year. The objective is a simple one, and is to reduce the disparity between the tax rates charged on income and wealth that currently exists.

My question is a straightforward one, and is whether or not readers think that this is a good idea, and how they might improve the suggestion?