Short answer: It depends on your goals. If the priorities are raising stable revenue and reducing very high-end inequality with limited impact on growth, there’s a solid case for somewhat higher effective tax rates on the ultra‑wealthy—achieved more by broadening the base and tightening preferences on capital income than by simply hiking the top labor‑income bracket. If your top priority is maximizing after‑tax investment incentives and minimizing any risk of capital flight, you’d lean against higher rates and toward base‑broadening without rate increases.
Reasons people argue for higher top‑end taxes
•Diminishing marginal utility: A dollar taken from very high incomes likely reduces welfare less than a dollar taken from middle incomes.
•Revenue needs: The bulk of additional, reliable revenue tends to be concentrated at the top where income and wealth are concentrated.
•Horizontal equity: Much of top‑end income is capital gains/dividends taxed below wage rates and often deferred for years; aligning treatment can improve fairness.
•Market power and rents: Some high incomes reflect monopoly power, location rents, or luck; taxing rents is relatively efficient.
Reasons people argue against
•Behavior and avoidance: Higher rates can spur sophisticated avoidance, timing of gains, or shifting income form (labor to capital/pass‑throughs).
•Investment and entrepreneurship: If expected after‑tax returns fall, some risk‑taking and domestic investment could decline at the margin.
•Mobility and tax competition: Very high‑net‑worth individuals and capital are more mobile across borders and entities.
•Complexity and enforcement: Big changes without stronger enforcement/reporting can miss targets and add compliance burdens.
If you do raise “top-end” taxes, designs that limit downsides
•Target capital income at very high incomes: Narrowly align long‑term capital gains/dividends with ordinary rates above a high threshold (e.g., >$1–2M of income), with safeguards like averaging, inflation indexing, or a modest exclusion to protect typical savers.
•Limit deferral and step‑up: Curb or end step‑up in basis at death (with generous exemptions), or tax large unrealized gains at death/carryover basis to reduce “buy, borrow, die” strategies.
•Surtaxes on ultra‑high AGI: Small surtaxes only above very high incomes (e.g., >$5–10M), leaving upper‑middle and typical high earners untouched.
•Strengthen enforcement/reporting: More third‑party reporting for pass‑throughs, information returns on digital assets, and well‑resourced audits focused on complex high‑income cases.
•Close narrow preferences: Tighten rules on carried interest, large pass‑through losses, and closely‑held valuation discounts, while simplifying the broader code.
•Coordinate internationally: Pair personal‑tax changes with corporate‑tax coordination to reduce shifting across entities and borders.
Alternatives if you’d rather not raise statutory top rates
•Keep rates, broaden the base: Cap or phase down certain deductions/deferrals at very high incomes; integrate corporate and shareholder taxes to reduce arbitrage.
•Shift toward progressive consumption taxes: Add a VAT with sizable rebates/credits and maintain progressive income taxes—raising revenue with fewer distortions while protecting low/middle households.
A practical takeaway
•If your aims are more revenue and progressivity with manageable efficiency costs, favor modest increases in effective taxation of ultra‑high incomes and large unrealized gains, paired with strong enforcement and international coordination.
•If your aims are maximum simplicity and investment incentives, focus on base‑broadening and enforcement without higher top rates.
Are you asking about the United States specifically, and do you care more about revenue, inequality, growth, or simplicity? I can sketch a concrete package aligned to your priorities.