Can I Retire Early with $4 Million?

$4 million is solidly Fat FIRE: $110,000–$160,000/year in sustainable spending depending on your retirement age and horizon. The portfolio math works at virtually any age on this list. What changes at $4M — compared to $3M — is the degree to which IRMAA tier-2 becomes the central planning constraint, not just an edge risk.

At $3M, spending $82K–$120K/year, IRMAA tier-2 ($137,000 MAGI for single filers) is a boundary you might brush. At $4M, spending $110K–$160K/year, it's the wall you're planning around. Three constraints define the $4M early retirement plan: First, IRMAA tier-2 risk — most $4M spending levels generate MAGI that sits in or near the tier-2 surcharge zone ($137K–$171K single), making Medicare premium management a multi-decade project. Second, the SEPP catastrophe — a 72(t) fixed amortization on a $4M IRA produces approximately $240,000/year of forced ordinary income, blowing past every IRMAA tier and the NIIT threshold simultaneously; at $4M, SEPP is not a planning option. Third, the Roth conversion corridor — the gap between staying in the 22% bracket and crossing IRMAA tier-1 ($109K single MAGI) is navigable but requires discipline throughout a 15–25 year pre-RMD window.

$4 Million Early Retirement Calculator

Enter your retirement age, spending, and filing status. The calculator shows whether $4M covers your plan, your estimated IRMAA tier based on income source, the Roth conversion corridor available at your income level, and your NIIT exposure.

What $4 Million Supports at Each Retirement Age

The safe withdrawal rate drops as the horizon extends — from 2.75% at age 35 to 4.0% at age 60. This table shows the annual spending $4 million can sustainably support, and the IRMAA tier that level of spending would reach if drawn entirely from ordinary income.

SWR rates from Bengen (1994), Blanchett, Pfau, and the Big ERN Safe Withdrawal Rate series. IRMAA tiers 2026 per SSA POMS; based on single-filer MAGI. If spending from Roth distributions and LTCG below 0% threshold — not ordinary income — IRMAA impact can be significantly lower. Consistent with the safe withdrawal rate calculator.

IRMAA: The Primary Planning Constraint at $4 Million

IRMAA (Income-Related Monthly Adjustment Amount) is a surcharge on Medicare Part B premiums for beneficiaries above certain income thresholds. For a $4M early retiree, it is the most impactful long-run tax beyond the bracket itself — because it applies continuously at Medicare age and beyond, and because the 2-year lookback means your income decisions at 63–64 set your Medicare premiums at 65–66.¹

Source: SSA POMS HI 01101.020; 2026 IRMAA adjustment amounts. Base Part B premium $185.00/month in 2026; surcharges are per-person per-year in addition to the base premium. Medicare Part D IRMAA surcharges are separate and additive. IRMAA applies based on MAGI from 2 years prior (e.g., 2026 Medicare premiums based on 2024 MAGI).

For a $4M early retiree retiring at 50 and spending $140,000/year primarily from traditional IRA draws, the lifetime IRMAA cost at tier-2 rates could easily exceed $60,000–$80,000 in surcharges across a 25-year Medicare enrollment (age 65–90). Converting traditional assets to Roth during the 15-year window before Medicare eligibility — and sourcing spending from Roth and taxable accounts during those years — is the mechanism that eliminates this cost.

The critical window: ages 50–64 (before Medicare). If you spend these years converting $80,000–$109,000/year from traditional IRA to Roth, staying under IRMAA tier-1, you enter Medicare at 65 with a smaller traditional IRA generating lower mandatory MAGI. Miss this window, and forced RMDs from a compounded $3M–$5M traditional IRA lock you into tier-2 or tier-3 permanently.

The SEPP Trap at $4 Million

The 72(t) Substantially Equal Periodic Payment (SEPP) rule lets you withdraw from an IRA before age 59½ without the 10% early withdrawal penalty, using a fixed annual distribution determined by your account balance, life expectancy, and a government-set interest rate ceiling.²

At $4 million, SEPP is not a planning strategy — it's a catastrophe in slow motion.

Using fixed amortization at the 2026 maximum rate of 5.00% (IRS Notice 2022-6), SEPP on a $4M traditional IRA produces:

SEPP calculated using fixed amortization at 5.00% maximum rate (IRS Notice 2022-6); IRS Pub 590-B Table I life expectancy factors (T.D. 9930, 2022 tables). Commitment period is the longer of 5 years or age 59½. Modifying the payment before the commitment period ends triggers all deferred penalties plus interest retroactively.

The alternatives to SEPP at $4M:

• Taxable brokerage bridge: No penalty, no commitment, no income unless you realize LTCG. The primary pre-59½ vehicle for $4M early retirees who hold index funds with large unrealized gains.
• Roth conversion ladder: Convert traditional IRA each year (up to IRMAA tier-1 corridor — $109K single), access conversions after 5 years. Penalty-free, flexible, and reduces the RMD time bomb simultaneously.
• Rule of 55: If separating from the employer that holds your 401(k) at age 55+, penalty-free access with no fixed schedule. Does not apply at 35–54. Rollover to IRA before leaving permanently eliminates it.

Roth Conversion Strategy at $4 Million

The Roth conversion golden window — the years between retirement and Social Security / RMD onset — is the most valuable tax planning opportunity for a $4M early retiree. It is also narrow.

For a single filer in 2026, the conversion corridor looks like this:

• 22% bracket ceiling: $105,700 taxable income = ~$121,800 gross income (after $16,100 standard deduction). Conversions at or below this amount stay in the 22% bracket.
• IRMAA tier-1 threshold: $109,000 MAGI. For Medicare-eligible early retirees (age 63+), conversions that push MAGI above $109,000 trigger an $888/year Part B surcharge at age 65 (2-year lookback).
• Practical annual conversion limit (single, zero other income): ~$109,000/yr to stay under IRMAA tier-1 and in the 22% bracket.

For an MFJ couple, the corridor is wider:

• 22% bracket ceiling: $211,400 TI = ~$243,600 gross income (after $32,200 standard deduction).
• IRMAA tier-1 threshold: $218,000 MAGI combined. Conversions up to ~$218,000 stay under tier-1 (if no other ordinary income).
• Practical annual conversion limit (MFJ, zero other income): ~$218,000/yr.

At $109,000/yr of conversions (single) applied to a $2M traditional IRA starting at age 50:

• Conversion depletes $2M in roughly 18+ years (before accounting for market growth)
• With 7% nominal growth on the remaining balance, the traditional IRA grows faster than you convert unless you begin in your 40s or early 50s
• This is why the conversion must start on the first day of retirement, not in your early 60s

For MFJ couples at $4M, the $218,000/yr corridor means a $2M traditional IRA can be converted in roughly 9–12 years — much more manageable. The MFJ IRMAA advantage is one of the most underappreciated benefits of two-person household early retirement planning. See FIRE for couples for the joint strategy.

Net Investment Income Tax (NIIT) at $4 Million

Above $200,000 MAGI (single) or $250,000 (MFJ), an additional 3.8% NIIT applies to net investment income under IRC § 1411. Investment income for NIIT purposes includes:

• Qualified dividends and interest
• Long-term and short-term realized capital gains
• Rental income (unless real estate professional)

It does not apply to Roth distributions, return of principal from taxable accounts, Social Security benefits, or distributions from tax-deferred accounts (those are ordinary income and subject to income tax, not NIIT).

For a single $4M early retiree spending $140K/year:

• If spending from taxable LTCG: $140K is below the $200K NIIT threshold — no NIIT
• If spending $100K from taxable + $40K from traditional IRA: ordinary income ($40K) + LTCG ($100K) = $140K total; below NIIT threshold
• If running a $90K Roth conversion + $50K taxable LTCG + $100K traditional draw: MAGI ≈ $240K — $40K above the NIIT threshold; NIIT ≈ $1,520/yr

At $4M spending levels, NIIT is real but manageable. Sourcing spending primarily from Roth and basis-return in taxable — with LTCG sized to stay under the NIIT threshold — is achievable. The harder constraint is IRMAA: managing IRMAA automatically keeps most $4M early retirees near or below the NIIT threshold as well.

The RMD Time Bomb at $4 Million

Required Minimum Distributions begin at age 73 for those born 1951–1959 and age 75 for those born in 1960 or later (SECURE 2.0 § 107). For a $4M early retiree with a large traditional IRA, RMDs at 73–75 can force $300,000–$500,000/year of ordinary income — locking in IRMAA tier-3 or tier-4 permanently, at an age when you can no longer do anything about it.

Illustrative projection for a $4M early retiree at age 50 with $2.5M in a traditional IRA:

Projection uses 7% nominal growth on traditional IRA balance, net of annual Roth conversion. RMD divisor 26.5 from IRS Uniform Lifetime Table (age 75). Projection is illustrative; actual outcomes vary with market returns. Roth 401(k) accounts have no lifetime RMD beginning 2024 (SECURE 2.0 § 325).

At $510,000/year of RMDs with no prior conversion, a single filer would land deep in IRMAA tier-4 ($205,000+ threshold) and the 32% or 35% ordinary income bracket — permanently. The $109,000/year conversion scenario, maintained for 25 years, reduces the RMD burden by nearly half. The tax rate on conversions (22%) is almost certainly lower than the rate you'd pay on forced RMDs at 75 (likely 24–32%).

Roth accounts you convert to have no lifetime RMD, grow tax-free, and pass to heirs at a step-up in income-tax basis (no income tax owed, though heirs must deplete within 10 years under SECURE 2.0). See the estate planning guide for the full inherited IRA analysis.

The AUM Advisor Trap at $4 Million

A 1% assets-under-management (AUM) fee on $4 million is $40,000/year. At a 3.5% withdrawal rate, that fee consumes 29% of your annual income and reduces your effective withdrawal rate from 3.5% to 2.5% — the equivalent of needing $5.7M instead of $4M to sustain the same spending.

The same planning — IRMAA corridor optimization, Roth conversion ladder, RMD projection, withdrawal sequencing — is available from a fee-only advisor charging $5,000–$15,000/year in a flat or hourly structure. The math on fee-only at $4M is unambiguous: the annual saving of $25,000–$35,000 pays for a decade of financial planning services.

The AUM model also creates a structural conflict at $4M: advisors who charge on the total portfolio have an incentive to keep your assets at the firm rather than recommend converting traditional assets to Roth (which would show up as "assets leaving") or spending from taxable (reducing the managed balance). A fee-only planner has no such conflict. See the how to choose an early retirement advisor guide for diagnostic questions.

Is $4 Million Enough?

$4M is solidly enough if:

• Your target spending is $110,000–$160,000/year (depending on retirement age)
• You're willing to source spending from Roth/taxable to manage IRMAA
• You begin Roth conversions on the first day of retirement and sustain them for 15+ years
• You have a taxable brokerage or Roth balance to bridge pre-59½ without relying on SEPP
• Healthcare costs are modeled at full unsubsidized ACA premiums (you're above the subsidy cliff)

$4M may feel tight if:

• Nearly all $4M is in a traditional IRA or 401(k), with minimal taxable or Roth assets
• Spending target is $160,000+/year, particularly at younger ages with longer horizons
• You have significant fixed costs (mortgage, family obligations) that compress flexibility
• IRMAA management and Roth conversion laddering are not part of your plan

How Much More Than $4 Million for Higher Spending?

At 3.5% SWR (40-year horizon, retire at 50). Adjust using the SWR table above for other retirement ages.

Working with a Fee-Only Advisor at $4 Million

A $4M early retirement has the resources to handle a 30–50 year retirement comfortably — but IRMAA management, the Roth conversion corridor, the pre-59½ access strategy, and the RMD time bomb are multi-decade optimization problems that compound if handled wrong in the first decade. A specialist who has modeled the full 40-year income projection — IRMAA tier by tier, conversion year by year, RMD impact at 75 — can identify $200,000–$500,000 in lifetime tax and Medicare savings that a generalist will miss.

1. SSA: Medicare Part B Premiums and IRMAA — 2026 IRMAA adjustment amounts; tier thresholds $109K/$137K/$171K/$205K (single) and $218K/$274K/$342K/$410K (MFJ); 2-year lookback; base Part B premium $185.00/month (2026).
2. IRS: Substantially Equal Periodic Payments (72(t)) — IRS Notice 2022-6 — 5.00% maximum rate for fixed amortization and annuitization methods; life expectancy Table I from IRS Pub 590-B (T.D. 9930, 2022 tables).
3. IRS Rev. Proc. 2025-32 — 2026 tax year: standard deduction $16,100/$32,200 (single/MFJ); 22% bracket ceiling $105,700/$211,400 TI; 24% bracket ceiling $201,775/$401,950 TI; 0% LTCG threshold $49,450/$98,900 TI.
4. IRS Publication 590-B (2022+) — IRS T.D. 9930 — Uniform Lifetime Table for RMD calculations; RMD divisor 26.5 at age 75; Single Life Table for SEPP life expectancy factors.
5. Kitces: Safe Withdrawal Rate Research — Bengen (1994), Blanchett/Pfau (2013), Big ERN series; extended-horizon SWRs for 40–55 year retirements consistent with the SWR calculator on this site.

Values verified June 2026. IRMAA 2026: SSA POMS HI 01101.020. Tax brackets: IRS Rev. Proc. 2025-32. SEPP rate: IRS Notice 2022-6. NIIT: IRC § 1411. RMD rules: SECURE 2.0 § 107.