I don’t know that flat tax is necessary - progressive taxation is a sane policy, as the marginal utility of money goes down the more of it you have, and therefore a larger tax burden is more easily borne - however addressing the gap between how asset and employment income are taxed is critical to combatting gross wealth asymmetry.
I write this as a member of the asset-owning class. I wasn’t always - I worked in the U.K., with my income automatically taxed via PAYE (Pay As You Earn), and paid between 20 and 45% effective tax rates on my earnings.
Now, my income is rentals and investments, and my effective tax rate is nearer 5%, on a much larger income than I ever had from employment. I’ve not done anything special or weird, I’ve just paid capital gains and written down the allowable expenses. It would not be hard to pay no tax, just by restructuring my finances a little, but it doesn’t sit well with me as it is.
Honestly, it’s nonsensical. At the very least asset income should be taxed at the same rates as labour income - but it should probably be taxed at a higher rate, as penalising productive labour and rewarding rent-seeking is ultimately contrary to the interests of everyone.
One could always tax land ownership. It cannot be hidden or escaped from. It's also the ultimate scarce resource and yet there are landlords who do nothing just draw rent from those who actually utilize the land.
An addendum re the UK: it's funny how the UK tax scheme is so punitive on the middle class. Earn 100k pounds gross and take home 50k. But the moment you become an asset owner, you can basically optimize all of it away. The two income brackets "supported" by the UK tax regime are the poorest and the richest.
I write this as a member of the asset-owning class. I wasn’t always - I worked in the U.K., with my income automatically taxed via PAYE (Pay As You Earn), and paid between 20 and 45% effective tax rates on my earnings.
Now, my income is rentals and investments, and my effective tax rate is nearer 5%, on a much larger income than I ever had from employment. I’ve not done anything special or weird, I’ve just paid capital gains and written down the allowable expenses. It would not be hard to pay no tax, just by restructuring my finances a little, but it doesn’t sit well with me as it is.
Honestly, it’s nonsensical. At the very least asset income should be taxed at the same rates as labour income - but it should probably be taxed at a higher rate, as penalising productive labour and rewarding rent-seeking is ultimately contrary to the interests of everyone.