Understanding the Tax Impact of Investment Incomes

High earners often track only their nominal federal tax bracket when evaluating investments. But in New York City, earning $400,000 means every investment dollar is subject to federal income tax, the 3.8% Net Investment Income Tax (NIIT), New York State income tax (~6.85%), and New York City personal income tax (~3.65%). Depending on statutory exemptions and preferential rates, the true marginal tax rate varies by more than 18.5 percentage points—from 27.8% to 46.3%.

1. The Scenario: An Investor Allocating $60,000 Across Asset Types

Meet Alex and Jordan, a married couple living in Manhattan (New York County, NY) in 2026. Together, they earn $400,000 in combined W-2 wages, placing them solidly in the 24% federal tax bracket.

Having already maxed their workplace 401(k) plans, they are deploying $60,000 of new annual investment capital into taxable accounts. To decide how to allocate their portfolio, they compare four common investment streams:

U.S. Treasuries & T-Bills: Fixed income backed by the federal government.
Qualified Dividends: Distributions from U.S. corporate equities and broad-market index funds.
Qualified REIT Income: Real Estate Investment Trust distributions (Section 199A dividends).
Non-Qualified Dividends & Corporate Bonds: Regular taxable interest and ordinary corporate distributions.

Because they reside in New York City, their returns are exposed to both state and municipal personal income taxes. Below is the exact marginal tax drag on each dollar from $0 to $60,000.

2. U.S. Government Interest (Treasury Bills & Notes)

27.8%-35.8% Marginal Rate

Treasury interest is taxed at ordinary federal rates (24.0%) plus the Net Investment Income Tax (3.8%). Crucially, under 31 U.S.C. § 3124, obligations of the federal government are strictly exempt from state and local taxes, completely eliminating New York State (6.85%) and New York City (3.65%) income taxes:

100% exempt from New York State and New York City income taxes.

Key Takeaway: In high-tax jurisdictions like NYC, the state and local tax exemption saves 10.5 cents per dollar of income, making a 5.0% Treasury yield produce higher net after-tax cash flow than a 5.5% corporate bond.

3. Qualified Dividends (U.S. Equities & Index Funds)

29.3% Marginal Rate

Under IRC § 1(h)(11), qualified dividends receive preferential federal long-term capital gains tax treatment (15.0%) plus the 3.8% NIIT. However, New York State and New York City do not provide preferential capital gains rates, taxing all dividends as ordinary income (10.5% combined):

Subject to preferential 15% federal rate, plus full state & local ordinary tax.

Key Takeaway: Even with state and city taxes applied in full, the federal 15% rate keeps the total marginal drag under 30%, confirming that broad-market equity index funds remain exceptionally tax-efficient in taxable brokerage accounts.

4. Qualified REIT Income (Real Estate Investment Trusts)

33.5% Marginal Rate

Under IRC § 199A, ordinary REIT dividends qualify for a 20% Qualified Business Income deduction, reducing the federal 24% bracket to an effective 19.2%. However, the 3.8% NIIT applies to 100% of the distribution, and New York State and NYC do not conform to Section 199A, taxing the full distribution at ordinary rates (10.5%):

20% federal Section 199A deduction applies; no state or NYC deduction.

Key Takeaway: Non-conforming state tax codes dilute the benefit of federal deductions. With a combined drag of 33.5%, REITs are significantly more tax-dragged in taxable accounts than Treasuries or equities and belong inside tax-advantaged accounts (Traditional or Roth IRAs).

5. Non-Qualified Dividends & Corporate Bonds

38.3%-46.3% Marginal Rate

Corporate bond interest and non-qualified dividends receive no statutory exemptions or deductions. Every dollar faces the full 24.0% federal ordinary bracket, the 3.8% NIIT, New York State tax (6.85%), and NYC personal income tax (3.65%):

Full ordinary federal, NIIT, state, and city tax rates apply.

Key Takeaway: Surrendering 38.3 cents of every dollar to taxes makes corporate bonds and non-qualified dividends the least tax-efficient asset to hold in a taxable account. These assets belong strictly in tax-deferred accounts like traditional 401(k)s.

6. Conclusion: Evaluate Marginal Drag Before Allocating

In jurisdictions with high state and local taxes, statutory exemptions (like 31 U.S.C. § 3124 for Treasuries) and deduction non-conformance create an 18.5% rate spread between asset classes. Generally, holding Treasuries and broad-market equities in taxable accounts while reserving tax-deferred accounts for corporate bonds and REITs shields significant compounding growth over an investment lifetime.

However, these exact rates reflect NYC residency and a 24% federal tax bracket. Depending on your state, municipality, and income tier, after-tax yields will vary. Before allocating new capital or placing yield-generating investments in a taxable account, evaluate the marginal tax drag specific to your jurisdiction and income mix.

See how your marginal tax rate varies by different investment incomes.

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