Retirement Income from $4 Million: What's Sustainable in 2026

At $4 million, the sustainability question is answered before you ask it. The question that dominates everything else is: what happens to your traditional IRA? A $4M IRA left unmanaged — no Roth conversions, no strategic drawdown — generates required minimum distributions above $200,000 per year by age 75 and above $250,000 by age 80. When layered with Social Security income, that pushes most couples squarely into IRMAA Tier 2 Medicare surcharges in any scenario with average or above-average investment returns. The difference between a tax-optimized and a tax-blind $4M retirement income plan can exceed $700,000 in lifetime after-tax income. Here's the full picture.

The baseline: what $4 million generates at different withdrawal rates

At $4 million, even conservative withdrawal rates produce substantial income. The planning constraint is almost never the gross withdrawal amount — it is the tax cost of those withdrawals and the Medicare surcharges triggered when income concentrates in a traditional IRA.

These rates assume a diversified portfolio (50–70% equities) and are pre-tax. The after-tax picture at $4M depends almost entirely on account structure — specifically, how much of the $4M sits in a traditional IRA versus taxable or Roth accounts.

Social Security adds meaningfully — and complicates the tax picture

Retirees who've accumulated $4 million typically have strong Social Security earnings records. Their SS benefits are generally above average. At the same time, the combination of large portfolio withdrawals and substantial SS income accelerates the provisional income calculation, driving more of SS into taxable status.

SS amounts reflect above-average career earners consistent with $4M accumulation. Personal estimates available at SSA.gov's "my Social Security" portal.

Notice what happens at the coupled scenario: $160,000 in portfolio withdrawals plus $72,000–$84,000 in SS produces gross income of $232,000–$244,000. On top of that, beginning at age 75, forced RMDs from a $4M+ traditional IRA substantially exceed spending needs — generating income that cannot be avoided and that lands in IRMAA territory as a matter of arithmetic, not bad luck.

The tax picture in early retirement: still manageable

Like the $3M scenario, the first years of retirement at $4M look surprisingly tax-efficient — before Social Security and before RMDs concentrate income in the mid-70s.

Worked example: George and Helen, both age 65 (MFJ), $4M all traditional IRA

George and Helen have $4 million in traditional IRAs combined. Annual spending is $160,000. Both are delaying Social Security to age 70. Filing status: married jointly.

Bridge period — age 65, no SS, IRA funds spending:

• IRA withdrawal for spending: $160,000
• Social Security: $0 (delaying to 70)
• AGI: $160,000

Taxable income:

• Standard deduction (MFJ, 2026): $32,200³
• Additional deduction, age 65+: $1,650 × 2 = $3,300³
• Total deductions: $35,500
• Taxable income: $160,000 − $35,500 = $124,500

Federal income tax (2026 brackets):³

• 10% on first $24,800: $2,480
• 12% on $76,000 (to $100,800): $9,120
• 22% on $23,700 (to $124,500): $5,214
• Total federal tax: $16,814

Result: On $160,000 of spending, George and Helen owe approximately $16,814 in federal income tax — an effective rate of 10.5%. Their AGI of $160,000 is below the $218,000 IRMAA Tier 1 threshold — no Medicare surcharge yet.⁵

The important difference from lower portfolio levels: George and Helen are already in the 22% bracket. Their taxable income of $124,500 has already passed through the full 12% range. There is no 12% conversion headroom — the entire Roth conversion opportunity during the bridge period costs at least 22% if funded from IRA draws. This is the fundamental challenge at $4M that doesn't exist at $2M or $3M.

At age 70 when Social Security begins

When George and Helen claim Social Security at 70:

• George's SS: $54,000/yr ($4,500/month, above-average earner)
• Helen's SS: $30,000/yr ($2,500/month)
• Combined SS: $84,000/yr
• IRA draw needed: $160,000 − $84,000 = $76,000

Social Security taxation (IRC §86):²

• Provisional income = $76,000 (IRA) + 50% × $84,000 (SS) = $118,000
• Above $44,000 MFJ threshold → 85% of SS is taxable
• Taxable SS = 85% × $84,000 = $71,400

AGI: $76,000 + $71,400 = $147,400

Taxable income: $147,400 − $35,500 = $111,900

Federal tax: 10% × $24,800 + 12% × $76,000 + 22% × $11,100 = $2,480 + $9,120 + $2,442 = $14,042 — effective rate of 8.8% on $160,000 spending.

AGI of $147,400 remains below the $218,000 IRMAA Tier 1 threshold. George and Helen are still in a comfortable position. This window — between retirement and the first RMD — is when the critical planning decisions must be made.

The forward problem: RMDs at 75 and near-certain IRMAA Tier 2

The manageable early years give way to forced income in the mid-70s. For those born in 1960 or later, RMDs begin at age 75.⁴ A $4M IRA, growing faster than the modest spending draws in the pre-RMD decade, arrives at age 75 with a balance well above $4M in any positive return scenario.

Projecting George's and Helen's combined traditional IRA:

• Ages 65–70: IRA draws $160,000/year while growing at various rates. At 5%, 5% growth on $4M ($200K/yr) outpaces the $160K draw — the IRA grows slightly. At age 70: approximately $4.22M at 5% growth.
• Ages 70–75: IRA draw drops to $76,000/year as SS covers the remainder. The IRA grows more aggressively. At age 75: approximately $5.0M at 5%, $5.5M at 6%, $6.1M at 7%, $6.8M at 8%.

RMD at age 75 (Uniform Lifetime Table divisor: 24.6):⁴

AGI calculation: RMD + 85% × $84,000 SS = RMD + $71,400 (provisional income far exceeds $44,000 MFJ threshold). IRMAA surcharge amounts reflect 2026 CMS rates (Part B + Part D combined), per couple. Portfolio projections assume prior December 31 balance for RMD calculation. Actual IRA balance at 75 depends on actual returns, which will vary.

The core insight at $4M: At $3M, IRMAA Tier 1 becomes likely at 6%+ returns. At $4M, IRMAA Tier 2 becomes the default outcome at 6%+ returns — one tier higher at every return scenario. In a 7–8% return environment (not unusual for a diversified portfolio over a decade), Tier 2 or Tier 3 surcharges arrive as a structural certainty, not a planning risk. The difference between Tier 1 and Tier 3 is $6,943/year in extra Medicare costs — $138,860 over a 20-year retirement, in 2026 dollars.

The Roth conversion challenge at $4M — harder than at $3M

The strategic response to IRMAA risk is Roth conversion during the bridge period. At $4M, the problem is more acute than at $3M for a specific reason: because bridge-period spending is $160,000/year, drawing that entirely from a traditional IRA already pushes taxable income to $124,500 — past the 12% bracket ceiling. There is no 12% conversion capacity remaining when the IRA funds spending.

Conversion headroom when IRA funds spending (baseline)

• AGI: $160,000 (IRA draw)
• Taxable income: $124,500 (after $35,500 deductions)
• 12% bracket ceiling: $100,800 of taxable income → already exceeded
• 12% headroom: zero
• IRMAA-safe conversion headroom: $218,000 − $160,000 = $58,000/year at 22%
• Annual conversion tax: $12,760
• 5-year total shifted to Roth: $290,000 at a 22% cost

Against a $4M IRA balance, converting $290,000 over five years at 22% is meaningful but insufficient. The projected age-75 IRA balance drops from ~$5.5M (at 6%) to ~$4.9M — still generating $199K in RMDs that land at IRMAA Tier 2. To move the needle materially, the taxable account approach is essential.

The taxable account unlock: rebuilding conversion capacity

If George and Helen fund their $160,000 annual spending from a taxable brokerage account instead of the IRA — realizing long-term capital gains on portfolio sales — the tax picture transforms, and meaningful Roth conversion capacity opens up.

Assume they sell $160,000 from taxable: $90,000 in long-term capital gains and $70,000 return of cost basis. No IRA draw.

• AGI: $90,000 (LTCG only; no ordinary income from IRA)
• Taxable income: $54,500 ($90,000 − $35,500 standard + senior deductions)
• LTCG tax check: $54,500 total taxable income < $98,900 MFJ 0% threshold → capital gains taxed at 0%³
• Federal income tax on LTCG alone: $0

With ordinary income now at $0 and AGI at $90,000, Roth conversion capacity opens:

• IRMAA-safe conversion ceiling: $218,000 − $90,000 = $128,000/year of additional ordinary income (Roth conversion) without crossing Tier 1
• First $44,400 of conversion: taxed at 10%/12% ordinary rates, while keeping total taxable income at or below the $98,900 LTCG 0% threshold^*
• Conversions above $44,400 through $128,000: at 22% ordinary rate, with portion of LTCG shifting from 0% to 15%

*Roth conversions add ordinary income that stacks below LTCG in the tax calculation. Converting beyond the point where total taxable income exceeds $98,900 causes a portion of LTCG to shift from the 0% rate to 15%. Each $1 of conversion above that threshold costs the 22% ordinary rate plus an additional 15% on the shifted LTCG — in effect a ~37% marginal cost at the crossover. Staying under the $98,900 threshold is the cleanest conversion strategy when LTCG is the other income source.

Converting $640,000 to Roth over five years reduces the projected age-75 IRA from ~$5.5M to approximately $4.6M at 6% returns. The revised RMD: $4,600,000 / 24.6 = $186,900. Combined with taxable SS: $186,900 + $71,400 = $258,300 — below the Tier 2 threshold of $274,000 and in the upper Tier 1 zone. One more year of aggressive conversion could fully clear Tier 1 with a more conservative return assumption.

The key constraint is the size of the taxable account. A $4M portfolio with $600,000–$800,000 in taxable assets can support this full strategy. A $4M portfolio that is almost entirely traditional IRA has fewer levers and must rely more on 22%-rate conversions or supplementary tools.

Supplementary tools: QLAC and QCD

Qualified Longevity Annuity Contract (QLAC)

A QLAC lets you use up to $210,000 of IRA funds to purchase a deferred annuity that begins paying income at an age you choose (up to 85).⁶ The QLAC premium is excluded from the RMD calculation — reducing the IRA balance subject to annual RMDs. At $4M, if both spouses each use $210,000 for QLACs, the combined IRA balance for RMD purposes drops by $420,000.

Effect on age-75 RMDs (6% return scenario, $5.5M projected IRA minus $420K QLAC exclusion = $5.08M):

• Revised RMD: $5,080,000 / 24.6 = $206,500 (vs $223,600 without QLAC)
• Revised AGI: $206,500 + $71,400 = $277,900
• Result: Just into Tier 2 territory — the QLAC reduces but does not eliminate the IRMAA problem at 6% returns

The QLAC is a useful complement to Roth conversions, not a substitute. Its best use at $4M is shaving the top off RMD income in conjunction with a conversion strategy — and providing longevity insurance if both spouses live into their late 80s.

Qualified Charitable Distribution (QCD)

At age 70½ or older, a QCD allows up to $111,000 per year, per person, to be donated directly from a traditional IRA to a qualified charity — excluded from AGI entirely.⁷ Unlike a regular charitable deduction, a QCD reduces income before it enters the AGI calculation, directly lowering provisional income (and thus taxable SS) and IRMAA exposure.

At $4M, if George and Helen each use $111,000 in QCDs at age 75 to satisfy part of their RMD:

• Total RMD at 6% return: ~$224,000
• QCDs used: $111,000 × 2 = $222,000 — covers nearly the entire RMD
• Taxable IRA distribution remaining: $224,000 − $222,000 = $2,000
• Revised AGI: $2,000 + $71,400 (SS) = $73,400 — below all IRMAA thresholds

For charitably inclined retirees at $4M, QCDs are one of the most powerful planning tools available. They eliminate IRMAA exposure, reduce Social Security taxation, and satisfy the RMD simultaneously. The tradeoff: the donation must go to a qualifying public charity (not a donor-advised fund). For retirees who were planning charitable giving anyway, the QCD is the correct vehicle.

Asset location: how account structure changes everything

The NIIT consideration at $4M

The Net Investment Income Tax imposes a 3.8% surtax on dividends, capital gains, and taxable interest when MAGI exceeds $250,000 (MFJ). These thresholds are not inflation-adjusted — they have been fixed at $250,000 MFJ since 2013, so they capture a growing share of higher-income retirees each year.⁸

At $4M, the NIIT appears in several ways:

• Taxable account dividends and interest: If the $700,000–$1M taxable account generates $30,000–$50,000 in qualified dividends and interest, all of it faces 3.8% NIIT if MAGI exceeds $250,000. On $40,000 of investment income, that is $1,520/year — small but real.
• Asset sale years: Selling a concentrated position, vacation property, or large taxable reallocation in a year when other income is elevated can push MAGI well above $250K, triggering NIIT on the full gain above the threshold.
• RMD years: IRA distributions are not investment income for NIIT purposes, but they are included in MAGI. A large RMD at 75 that pushes MAGI above $250K subjects any investment income received that year to the 3.8% surcharge — including dividends and capital gains from the taxable account.

The practical implication: in years when RMDs are large (post-75), harvest capital losses from the taxable account before year-end to offset NIIT-exposed gains, and consider directing dividend-heavy holdings to the IRA (where they don't generate NIIT) rather than the taxable account (where they do).

Estate planning: OBBBA changes the picture

At $4 million, federal estate tax is no longer a concern for the vast majority of households. The One Big Beautiful Bill Act (OBBBA, July 2025) permanently set the federal estate and gift tax exemption at $15,000,000 per individual.⁹ Married couples can combine exemptions for a $30,000,000 per-couple threshold under portability. The prior scheduled 2026 sunset to approximately $7M per person was eliminated.

However, the income tax implications of inheritance remain significant at $4M. The largest issue: a $3–4M traditional IRA inherited by non-spouse beneficiaries (typically adult children) must be drained within 10 years under the SECURE Act 10-year rule — with annual RMDs required when the decedent died after their required beginning date (T.D. 10001). That 10-year income dump, layered on top of the beneficiaries' own earned income, often pushes them into the 32%–37% bracket for a decade.

A partially converted Roth IRA passed to heirs instead of a traditional IRA can represent hundreds of thousands in tax savings for the next generation — not just for the original owner. At $4M, the choice of "do I convert to Roth?" is also the choice of "what kind of inheritance do I leave?"

Five variables that determine whether $4 million is enough for you

1. Account mix (the dominant variable at $4M)

More than at any lower portfolio level, the account structure — how $4M is split among traditional IRA, taxable, and Roth — determines the lifetime after-tax income and the size of the RMD problem. An all-IRA $4M and a mixed $4M with $1M in Roth and taxable can produce outcomes $600,000–$800,000 apart in lifetime after-tax income. This single variable is worth more attention, and more active management, than any investment return optimization.

2. Spending level

At 4% ($160,000/year) plus meaningful Social Security ($72,000–$84,000/year for a couple), total income approaches $244,000 — covering virtually any household budget, including significant travel, healthcare, and discretionary spending. At $4M, the sustainability question is closed. The only spending scenario that creates genuine risk is early retirement (before 55) with a 40+ year horizon and very high spending ($250,000+/year), where the combination of early draws and a long horizon can still exhaust a $4M portfolio in adverse return sequences.

3. Social Security timing (delay to 70 is compelling)

At $4M, bridge income is ample to delay Social Security to 70 without financial hardship. The 8% per year delayed retirement credit from full retirement age to 70 is a permanent, inflation-adjusted increase with no investment risk. For a couple where the higher earner claims $54,000/year at 70, that is $11,520/year more than at FRA — permanent, for life. Crucially, the survivor benefit is based on the higher earner's record: if George dies first, Helen receives George's $54,000/year (inflation-adjusted) rather than a lower benefit. Delaying to 70 is both the financial and spousal protection choice.

4. IRMAA management (structural priority, not edge case)

At $1M, IRMAA is an afterthought. At $2M, a planning variable. At $3M, a near-certainty without Roth conversion. At $4M, IRMAA Tier 2 is the default outcome in average market conditions — $5,770/year in extra Medicare costs, per couple, indefinitely. The Roth conversion window between retirement and age 75 is the primary tool. The taxable account is the fuel. Managing IRMAA well at $4M is worth $5,000–$9,000/year, every year, for as long as both spouses live — a permanent annual savings that far exceeds the cost of the conversion taxes paid to achieve it.

5. Inheritance and legacy structure

At lower portfolio levels, inheritance planning is secondary to income security. At $4M, with federal estate tax off the table (OBBBA $30M per couple), the primary legacy question shifts to income tax: traditional IRA assets left to non-spouse heirs generate a 10-year taxable income stream that can cost beneficiaries 32%–37% in federal income taxes. Strategic Roth conversion during the owner's retirement — paid at 12%–22% — to convert traditional to Roth can save heirs $100,000–$200,000 in income tax on a $1M inherited IRA. At $4M, this is legitimate planning territory, not theoretical.

When $4 million is enough — and the edge cases where it isn't

$4M is more than sufficient if:

• Annual spending is $120,000–$180,000 and both spouses have meaningful Social Security
• Retirement begins at 60 or later, with a 30–35 year horizon
• The account mix includes at least some taxable or Roth to support Roth conversion strategy
• Charitable intent exists — QCDs can nearly eliminate RMD-driven IRMAA exposure for charitably inclined retirees

$4M can be strained if:

• Annual spending exceeds $300,000/year with minimal Social Security — a solo earner drawing 7.5% of a $4M portfolio needs Guyton-Klinger flexibility or a very short horizon
• The entire $4M is in a traditional IRA with no Roth or taxable — IRMAA Tier 2 is structurally locked in at normal returns, and Tier 3 is possible in strong-market scenarios; there are no levers to pull after RMDs begin
• A catastrophic long-term care event compounds with portfolio losses — a 4–5 year memory care stay nationally averages $516,000–$645,000; if it coincides with a bear market in the early 70s when conversions were expensive and the IRA remained large, the combined hit can dent a $4M portfolio significantly
• Retirement begins at or before 55 — a 40+ year horizon at 4% has non-trivial failure risk in adverse sequences; the 3.0–3.5% range is more appropriate for true early retirement at this portfolio level

The $4M question is about tax architecture — and who benefits from it

At $500,000, the central question is "will Social Security carry the load?" At $1 million, it's "does the math hold?" At $2 million, it's "what's the optimal structure?" At $3 million, it's "when does the window close to fix the tax architecture?" At $4 million, there is one more dimension: "whose lifetime are we optimizing for — ours, or also our heirs?"

The conversion decisions made between retirement and the first RMD determine not just the retirees' Medicare costs and lifetime after-tax income, but also the after-tax value of what they pass on. A traditional IRA liquidated by a 68-year-old at 22% creates far more family wealth than the same IRA liquidated by a 45-year-old beneficiary at 35%.

The planning window — the decade between early retirement and RMD age 75 — is finite. Once RMDs begin at $200,000+ per year, bracket headroom for new conversions essentially disappears. The taxable account depletes. The levers available to change the outcome are mostly gone. The decisions made between ages 62 and 74 are the ones that matter most.

A fee-only retirement income specialist will model the full RMD trajectory, Roth conversion capacity by year, IRMAA exposure by scenario, QCD and QLAC fit, and multi-generational tax cost — and show you exactly what the structured plan saves versus the default. At $4M, the math on that analysis pays for itself many times over.

Sources

1. William Bengen — "Determining Withdrawal Rates Using Historical Data" (1994), Journal of Financial Planning. Foundational research establishing the 4% initial withdrawal rate based on US equity and bond return sequences 1926–1992. At $4M, portfolio sustainability at Bengen-era withdrawal rates is rarely the primary planning concern; tax structure and IRMAA management dominate.
2. IRS Publication 915 — Social Security and Equivalent Railroad Retirement Benefits. IRC §86 provisional income thresholds: $32,000 (MFJ) begins 50% SS taxation; $44,000 (MFJ) begins 85% SS taxation. These statutory thresholds have not been adjusted for inflation since 1993, capturing a growing share of retirees as nominal incomes rise.
3. IRS — Tax Inflation Adjustments for Tax Year 2026 (IRS Rev. Proc. 2025-61). 2026 standard deduction: $32,200 (MFJ). Additional deduction age 65+: $1,650 per qualifying spouse. 10% bracket top: $24,800 (MFJ taxable income). 12% bracket top: $100,800. 22% bracket top: $211,400. Long-term capital gains 0% threshold: $98,900 (MFJ taxable income); 15% threshold: $613,700 MFJ.
4. IRS Publication 590-B — Distributions from Individual Retirement Arrangements. RMD age: 73 for those born 1951–1959; 75 for those born 1960 or later (SECURE 2.0 §107, Pub. L. 117-328). Uniform Lifetime Table divisor at age 75: 24.6. RMD is calculated on the prior December 31 account balance divided by the applicable divisor from the Uniform Lifetime Table.
5. CMS — 2026 Medicare Parts B Premiums and Deductibles. 2026 base Part B premium: $202.90/month per person. IRMAA Tier 1 (MFJ MAGI $218,001–$274,000): additional $81.20/month Part B + $14.50/month Part D per person — $2,296.80/year per couple. Tier 2 ($274,001–$342,000): +$202.90 Part B + $37.50 Part D per person — $5,769.60/year per couple. Tier 3 ($342,001–$410,000): approximately $9,240/year per couple. IRMAA is based on MAGI from 2 years prior.
6. IRS — Retirement Plans FAQs Regarding QLACs. Maximum QLAC premium: $200,000 (2024), adjusted for inflation under SECURE 2.0 (Pub. L. 117-328, §202) — $210,000 in 2026. QLAC premium excluded from RMD-triggering account balance. Income must begin by age 85. One QLAC per IRA owner, any number of qualifying insurers.
7. IRS Publication 590-B — Qualified Charitable Distributions. 2026 QCD annual limit: $111,000 per individual (IRS Rev. Proc. 2025-32, inflation-indexed). QCD must be transferred directly from IRA custodian to qualifying public charity. Excluded from AGI — reduces provisional income, IRMAA exposure, and income tax simultaneously. Donor-advised funds do not qualify.
8. IRS Form 8960 Instructions — Net Investment Income Tax. IRC §1411: 3.8% NIIT applies to net investment income (dividends, capital gains, taxable interest) when MAGI exceeds $200,000 (single) or $250,000 (MFJ). These thresholds are not adjusted for inflation. Traditional IRA distributions increase MAGI, potentially exposing investment income from taxable accounts to NIIT even though the IRA distribution itself is not investment income.
9. IRS — Tax Inflation Adjustments for Tax Year 2026 (IRS Rev. Proc. 2025-61), amended by OBBBA §70421. 2026 federal estate and gift tax basic exclusion: $15,000,000 per individual, permanently set by the One Big Beautiful Bill Act (July 2025, Pub. L. 119-XX, §70421). Married couples may combine exemptions for a $30,000,000 per-couple threshold. The prior scheduled 2026 sunset to ~$7M was eliminated by OBBBA.

Tax values reflect the 2026 tax year per IRS Rev. Proc. 2025-61 and CMS 2026 fact sheet. RMD projections use Uniform Lifetime Table divisors from IRS Pub. 590-B; portfolio projections are illustrative at stated return rates and do not represent guaranteed outcomes. SS income amounts reflect above-average career earners; actual benefits depend on individual earnings history. All examples are illustrative; consult a qualified fee-only advisor for planning specific to your situation. Values verified June 2026.