Inherited IRA and the 3.8% Net Investment Income Tax (NIIT)

One of the more confusing tax questions for higher-income inheritors: does the 3.8% surtax apply to inherited IRA distributions? The short answer is no — but the longer answer matters more for your planning.

What the NIIT is — and what it covers

The Net Investment Income Tax is a 3.8% surtax on "net investment income" (NII), established by the Affordable Care Act (§ 1411 of the Internal Revenue Code) and effective since 2013.¹ It applies when your MAGI exceeds:

Individual thresholds are statutory and have not been adjusted for inflation since 2013. Trust/estate threshold is indexed annually — see IRS Rev. Proc. 2025-32 for the 2026 value.

NII includes three categories under § 1411(c)(1):

• Category 1: Interest, dividends, annuities, royalties, and rents from property not used in an active trade or business
• Category 2: Income from passive activities and trading in financial instruments or commodities
• Category 3: Net gains from the disposition of property not used in an active trade or business

Wages, salaries, Social Security benefits, pension/annuity income, and — critically — distributions from IRAs and qualified retirement plans are not NII. They simply are not in any of the three categories above.

The NIIT amount is calculated as 3.8% × the lesser of:

• Your total NII, or
• The amount by which your MAGI exceeds the threshold

This "lesser of" structure means the tax is capped at whichever constraint binds first — your total investment income or the MAGI excess above the threshold.

Why inherited IRA distributions are not NII

When you withdraw money from an inherited traditional IRA, you recognize ordinary income under IRC § 408(d)(1). That income flows to Form 1040 as gross income and is taxed at ordinary rates — but it is categorically different from investment income as the tax code defines it.

Treasury Regulation § 1.1411-8(b) explicitly provides that distributions from IRAs described in § 408 and § 408A (Roth IRAs) are excluded from the definition of NII for purposes of § 1411.² The IRS confirmed this directly in its Q&A guidance on NIIT: "Distributions from IRAs are not included in Net Investment Income."³

This exclusion applies equally to inherited IRAs: whether you're withdrawing from your own traditional IRA or a traditional IRA you inherited from a parent, the distribution is not NII. No 3.8% applies to the distribution itself.

The MAGI problem: how an exempt distribution creates NIIT exposure

Here is the critical nuance. While IRA distributions are excluded from NII, they are still included in your gross income — and MAGI for NIIT purposes is essentially your AGI (with minor adjustments for foreign income exclusions). An inherited IRA distribution raises your MAGI dollar-for-dollar.

If that MAGI increase pushes you above the threshold, your other investment income — the dividends, capital gains, and rental income that genuinely are NII — can now become subject to the 3.8% surtax.

Illustration:

In this example, the inherited IRA distribution does not itself incur NIIT. But it pushed the $40,000 in dividends and capital gains into NIIT territory that they would otherwise have avoided. The IRA distribution created $1,520 of NIIT on income that had nothing to do with the IRA.

A larger example — the year-10 trap:

Suppose you defer all distributions and take a $600,000 lump sum in year 10. Your other income is $180,000 (wages, Social Security, dividends, capital gains). Your MAGI is now $780,000. You have $50,000 in dividends and capital gains. Your NIIT is 3.8% × $50,000 = $1,900 — because the MAGI excess of $580,000 is greater than the NII of $50,000, so the smaller number (NII) controls. The IRA distribution itself is still not NII, but the $50,000 of genuine investment income is fully exposed.

If your investment income were larger — say $200,000 in dividends and gains in a year you took a $500,000 inherited IRA distribution — the NIIT would be 3.8% × $200,000 = $7,600. At that level, the MAGI excess is the binding constraint only if it's smaller than the NII.

Inherited Roth IRA: genuinely invisible to NIIT

Qualified distributions from an inherited Roth IRA are excluded from gross income entirely (IRC § 408A(d)(1)). They do not appear in MAGI. For NIIT purposes, they are completely invisible — not just excluded from NII but absent from the MAGI calculation that determines whether NIIT applies at all.²

This makes the inherited Roth IRA significantly more valuable for beneficiaries with substantial investment portfolios: withdrawals carry no income tax, no MAGI inflation, no IRMAA risk, and no indirect NIIT exposure. The 10-year rule still applies, but the tax footprint is entirely different. See the Inherited Roth IRA guide for the full picture.

Exception: Non-qualified Roth distributions (when the original owner's 5-year rule is not satisfied) have taxable earnings that do appear in MAGI. This is rare for inherited Roth IRAs — the beneficiary inherits the original owner's 5-year clock — but worth checking if the original Roth account was opened recently before death.

Trust beneficiaries: a much harsher NIIT threshold

If a trust is the beneficiary of the inherited IRA, the NIIT picture is dramatically different. Estates and trusts reach the top income bracket — and the NIIT threshold — at approximately $15,200 of taxable income in 2026 (versus $200,000+ for individuals).⁴

For an accumulation trust holding inherited IRA distributions that are not distributed out to beneficiaries, this means:

• The trust pays 37% ordinary income tax on inherited IRA distributions above ~$15,200
• Any investment income accumulated in the trust above ~$15,200 is also subject to NIIT at 3.8%
• Combined marginal rate on accumulated trust investment income: 37% + 3.8% = 40.8%

Conduit trusts that distribute inherited IRA income out to individual beneficiaries in the same year avoid this trap — the income is taxed at the beneficiary's individual rates (typically lower) and the NIIT threshold is the individual's $200K/$250K threshold. See the trust beneficiary guide for the conduit vs. accumulation trust comparison.

Planning strategies to minimize NIIT exposure

1. Model the MAGI threshold before taking a distribution

Calculate your expected MAGI for the year before taking an inherited IRA distribution. If your non-IRA income (wages, dividends, capital gains, Social Security) is already at $160,000 and you're a single filer, you have a $40,000 NIIT buffer before your investment income becomes exposed. Taking more than $40,000 from the inherited IRA will push you over the threshold. This doesn't mean stopping at $40,000 — the NIIT cost may still be worth the income tax benefit of spreading distributions — but you should know the number before deciding.

2. Coordinate with capital gain and dividend timing

In a year when you're taking a large inherited IRA distribution, consider deferring discretionary capital gain realizations (selling appreciated stock, for example) to a different year. The IRA distribution inflates MAGI regardless of what you do with it; stacking a large gain realization on top adds to the investment income that becomes NIIT-exposed. Conversely, if you have capital losses to harvest, doing so in a year with a large IRA distribution can reduce the NII base and lower your NIIT bill.

3. QCDs at 70½ or older: reduce MAGI directly

A Qualified Charitable Distribution (QCD) from the inherited IRA to a qualified charity is excluded from gross income entirely — it never appears in your MAGI.⁵ The $111,000 QCD limit (2026) counts toward your 10-year depletion obligation and toward any annual RMD requirement. Unlike a standard charitable deduction on Schedule A, which only reduces taxable income (not MAGI), a QCD actually reduces MAGI. This means each dollar of QCD avoids not just income tax but also the MAGI inflation that would expose your other investment income to NIIT.

Example: $30,000 QCD vs. $30,000 withdrawal + charitable deduction. The QCD reduces MAGI by $30,000 — potentially keeping you below the NIIT threshold. The deduction does not. See the QCD from inherited IRA guide for eligibility rules.

4. Front-load distributions in lower-investment-income years

If you have years where your investment income (dividends, realized gains) will be lower — for example, years when you hold low-dividend positions or before a large capital gain event — those are the best years for larger inherited IRA distributions. The NIIT applies to the lesser of NII or MAGI excess, so lower NII in a year with the same MAGI excess means less NIIT.

5. Coordinate with IRMAA planning

The MAGI-inflation problem from inherited IRA distributions creates two parallel surtax risks: NIIT (applies in the current year when MAGI exceeds the threshold) and IRMAA (applies two years later as a Medicare premium surcharge). The planning strategies partially overlap: calibrating distributions to stay below MAGI thresholds helps both. But the timing differences matter — a distribution in 2026 affects 2026 NIIT and 2028 IRMAA. See the IRMAA guide for the full IRMAA interaction.

The NIIT vs. IRMAA vs. ordinary income tax: three separate layers

For high-income inherited IRA beneficiaries, large distributions interact with three distinct surcharge layers simultaneously:

Modeling just the income tax rate on an inherited IRA distribution understates the true marginal cost of a distribution in any given year. A $100,000 distribution for a 70-year-old single filer already in the 22% bracket might actually cost: $22,000 in federal income tax, plus $1,500+ in NIIT on existing investment income, plus $970+ in IRMAA two years later — a true marginal cost closer to 28–30 cents per dollar, not 22 cents.

Sources

1. IRS — Net Investment Income Tax. IRC § 1411 imposes 3.8% NIIT on the lesser of NII or MAGI excess above threshold. Individual thresholds: $200,000 (single), $250,000 (MFJ), $125,000 (MFS). Statutory thresholds, not inflation-adjusted. Effective for tax years beginning after December 31, 2012.
2. Treas. Reg. § 1.1411-8 — Distributions From Retirement Plans. Distributions from IRAs described in § 408 and § 408A are excluded from NII. Applies to both own IRAs and inherited IRAs. Qualified Roth distributions also excluded from MAGI entirely under § 408A(d)(1).
3. IRS — Questions and Answers on the Net Investment Income Tax (Q&A 12). "Distributions from IRAs are not included in Net Investment Income." Direct IRS confirmation that all IRA distributions — traditional, Roth, and inherited — are excluded from NII for NIIT purposes.
4. IRS Rev. Proc. 2025-32 — 2026 Tax Parameters. Sets the 2026 trust/estate top income bracket threshold (the level at which the NIIT threshold for trusts and estates is determined). Individual NIIT thresholds are statutory (unchanged from 2013 levels).
5. IRS — QCD Rules and 2026 Limit ($111,000). Qualified Charitable Distributions from IRAs (including inherited IRAs for eligible beneficiaries age 70½+) are excluded from gross income and thus excluded from MAGI. QCDs count toward annual RMD obligations and the 10-year depletion requirement. Limit indexed for inflation under SECURE 2.0 § 307.

NIIT rules verified as of June 2026 against IRS.gov and Treasury regulations. Individual NIIT thresholds ($200K/$250K) have been unchanged since 2013 as they are statutory, not indexed. Trust/estate NIIT threshold is indexed — verify current-year value at IRS.gov. This page reflects 2026 tax year rules.