IWMI vs MLPI: Which Is the Better Pick in 2026?

Overview

IWMI and MLPI are both monthly-income ETFs from NEOS using options overlays to generate high distributions, but they target fundamentally different underlying assets. The key distinction is asset class: small-cap equity versus energy-focused MLPs, which carry different growth profiles, tax treatments, and volatility patterns.

How they differ

IWMI's 14.65% yield comes from Russell 2000 holdings plus capped upside from short calls, while MLPI's 14.06% yield taps MLP distributions (which are typically larger than small-cap dividends) and its overlay mechanics. Both charge 0.68% in fees, but IWMI has a significant scale advantage with $1.25B in assets versus MLPI's $46.4M, and IWMI has been live since 06/24/2024 compared to MLPI's 12/18/2025. Tax treatment diverges too: IWMI explicitly uses section 1256 index options (favorable 60/40 long-term treatment) and loss harvesting, while MLPI's tax profile depends on underlying MLP distribution structure, which often includes K-1 forms and potential return-of-capital components.

Who each is best for

IWMI: Fits investors seeking monthly income from small-cap equity exposure who are comfortable with call-option caps on upside and value tax-efficient treatment through favorable long-term gains splitting.

MLPI: Fits investors drawn to energy infrastructure income and MLP sector dynamics who accept the K-1 reporting complexity and are willing to tolerate the structural volatility of leveraged energy MLPs.

Key risks to know

• Call-cap risk (IWMI): The covered call overlay caps upside if the Russell 2000 rallies sharply; income is prioritized over total return, so participation in strong rallies is limited by the strike selection. Over time, this can inflate tax liability when units are sold and may pressure NAV if distributions rely on capital returns rather than economic income.

• Yield sustainability at high rates: Both funds distribute 14.65% and 14.06%, respectively. If underlying assets deliver returns well below these rates, distributions may erode NAV or rely on option premium decay and non-dividend cash flows, creating a drag on long-term capital preservation.

• Liquidity and fund maturity (MLPI): With only $46.4M in assets and inception in 12/18/2025, MLPI is nascent and carries execution risk; the fund's overlay strategy may not be battle-tested through a full market cycle, and smaller AUM can mean wider bid-ask spreads.

• Energy sector concentration (MLPI): MLP exposure is inherently concentrated in energy and utility infrastructure, making it vulnerable to sector downturns, commodity volatility, and shifts in energy policy.

Bottom line

If you value small-cap equity income with tax-efficient option mechanics and established scale, IWMI offers one path; if you're targeting energy infrastructure yield and can manage MLP complexity and K-1 reporting, MLPI taps a different income source. Both distribute roughly 14%, but the underlying drivers and risks are distinct—small-cap covered calls versus leveraged energy MLPs. Past performance of either strategy does not predict future results.