This is an order of magnitude less than Bernie's 50% per-tech-trade tax (obviously impossible & bad), which he suggested as a means to fund the inevitable UBI [turns out former presidentical candiate Michael Yang wasn't wrong, just early, with his 2020 prediction].

Having never sold any stock on a short-term basis (i.e. I am a long-term value investor), I also disagree on the abysmally low tax rates I pay for long-term selling. To paraphrase the great Warren Buffet: the ultrarich should be taxed more and its unfair that the taxcodes don't require it.

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Having spent the majority of my working life as a bluecollar electrician, I can assure that my wagie tax burden (as percentage of income) is much higher than most fellow employed-by-tech readers, here.

The issues you raise aren't fixed by your proposal. A 5% transaction tax will hurt both the rich and small investors.

If you want to tax the rich, raise the cap on the capital gain tax rates for higher income (we already have the NIIT but you could raise it). If you think that capital gain taxes are unfairly low - they aren't, but let's say they are - just raise them. But a transaction tax is regressive and nonsensical. Being better than Sanders' proposals is no consolation in my book.

It's not about the aggregate tax burden. You're a long-term value investor because you live in a country where stock trading is an easy and low-friction thing the average person can do. A 5% transaction tax isn't really compatible with that; we would end up regressing to the global norm, where stocks are an esoteric hobby for rich people and the normal way to save for retirement is a savings account or cash piles under your mattress.