Only 19.55% of MUB Is New York Bonds. New York Doesn’t Exempt Interest From the Rest
Many New York retirees holding a popular national muni bond ETF assume their distributions arrive fully tax-free, but a quiet provision in state law can trigger a tax bill they never saw coming.
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Picture a New York retiree with $300,000 in the iShares National Muni Bond ETF (NYSEARCA:MUB). At a delayed intraday quote of $102.46 on October 15, 2026, that money buys 2,928 shares. At the current annualized forward distribution rate, those shares generate an estimated $9,813 a year, a 3.27% yield. The brochure calls it tax-free income. Under New York law, most of that income still faces state tax.
Per BlackRock (NYSE:BLK | BLK Price Prediction), BlackRock iShares’ fact sheet shows New York as the fund’s largest state at 19.55% as of June 30, 2026. It lists California next at 17.38% and Texas at 11.60%. The biggest piece is still a minority. Every bond issued outside New York lies beyond the state’s exemption.
How New York Taxes Your Out-of-State Muni Interest
The rule lives in N.Y. Tax Law § 612(b)(1). It requires a resident to add back to federal adjusted gross income “Interest income on obligations of any state other than this state, or of a political subdivision of any such other state unless created by compact or agreement to which this state is a party, to the extent not properly includible in federal adjusted gross income.”
In plain terms, interest Washington leaves alone can still be taxed by New York when it comes from another state’s bonds.
Your Year-End Tax Report Sets the Real Number
A fund holder receives interest as fund distributions. After year-end, the fund reports what share of its tax-exempt income came from each state. That income percentage determines your New York-exempt portion. The fact sheet’s holdings breakdown weights the portfolio on a single date, and a full year’s income mix can differ.
In practice, iShares’ 2025 tax-exempt interest by state report puts New York at 22.73% of MUB’s tax-exempt income, with California at 16.49%. iShares tells holders to multiply the tax-exempt interest in Box 12 of 2025 IRS Form 1099-DIV by the applicable state percentage. The figure changes every year, and iShares posts it in the tax documents section of its website. Apply your own rate to the non-New York share shown there.
A Tax-Equivalent Yield That Leaves Out State Tax
BlackRock iShares reports a 30-day SEC yield of 3.34% and a tax-equivalent SEC yield of 5.64% as of June 30, 2026. The fact sheet glossary explains the method: “National funds assume the highest Federal individual income tax rates while state-specific funds assume the highest state individual income tax rates plus federal rates.” For a New Yorker, BlackRock iShares’ 5.64% overstates the after-tax advantage. That follows the sponsor’s stated methodology.
That gap distorts comparisons with Treasurys. The 10-year Treasury yielded 5.21% on October 13, 2026, and N.Y. Tax Law § 612(c)(1) deducts U.S. obligation interest from a resident’s income. Federal tax applies to Treasurys, so any fair comparison needs both layers.
Where MUB’s Low Cost and Breadth Pay Off
On cost, BlackRock iShares charges a 0.05% expense ratio, or $5 a year per $10,000 invested, and spreads assets across 6,762 holdings as of June 30, 2026. Its benchmark, the ICE AMT-Free US National Municipal Index, bars bonds exposed to the alternative minimum tax (a parallel federal tax). The federal exemption is real and valuable.
Two Alternatives With Different Trade-Offs
The Vanguard Tax-Exempt Bond ETF (NYSEARCA:VTEB) tracks the same national exposure. Its adjusted price rose 17.85% over the 10 years through October 14, 2026, versus 17.19% for MUB. As a national fund, it carries the same state add-back. The iShares New York Muni Bond ETF (NYSEARCA:NYF) reported 99.99% New York-sourced tax-exempt income for 2025. The trade-off is concentration: one state’s budget, one state’s credit, far fewer issuers. A New Yorker in a lower bracket may reasonably prefer national diversification even after paying state tax.
Matching Each Fund to Your Tax Bracket
A national muni fund suits investors who want broad federal tax-exempt income and value diversification over state savings, including New Yorkers in lower brackets. For New York residents in higher brackets who hold MUB expecting fully tax-free income, the relevant comparison is a single-state fund. To check whether income escapes New York tax, open iShares’ annual Tax-Exempt Interest by State report, find MUB’s New York percentage, and match it against Box 12 of your Form 1099-DIV. It is the kind of quiet rule that costs retirees real money, and we documented several more like it in a free guide to the tax traps that drain retirement accounts.
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Ryne Mauck is an investment writer covering exchange-traded funds, retirement planning, and portfolio strategy. Through his work at 24/7 Wall St. and other investment platforms, including Seeking Alpha, he aims to provide clear, research-driven insights that help investors make more informed decisions while maintaining a long-term approach to investing.
Ryne holds a B.Sc. in Finance and an M.A. in Political Science. He is a formerly registered Municipal Advisor Representative and has passed the Series 50, Series 63, and Series 65 exams. His articles are not intended to be, nor should they be interpreted as, financial advice.
