Early Retirement Financial Planning Guide

An honest framework for the decisions at hand. Not tax or investment advice — your specifics matter.

FI number — the 4% rule and its honest caveats

• The classic "Bengen 4% rule": 25× annual spending in invested assets supports a 4% inflation-adjusted withdrawal rate for 30 years with ~95% historical success across rolling-period backtests of US equities and intermediate bonds.¹
• The 4% rule was designed for a 30-year retirement. A 45-year-old FI has a 45+ year horizon — extend to 3.25-3.5% for equivalent historical safety (Trinity-style updates for longer horizons).²
• For 40-year retirement: historical sustainable rate is closer to 3.25-3.5%. 28-30× spending is more defensible than 25×.

Healthcare: the bridge to Medicare

• Before 65 you need health insurance off-payroll. ACA marketplace plans under IRC § 36B are income-based — a FIRE household with low MAGI can qualify for premium tax credit (PTC) subsidies.³
• The enhanced PTC subsidies under the American Rescue Plan (2021) were extended by the Inflation Reduction Act through 2025 — 2026+ rules revert unless Congress acts. Verify current year's structure.
• This creates a tax-planning dependency: Roth conversions raise MAGI and can phase you out of ACA subsidies. Coordinate aggressively.
• Budget $500-1500/month/person for ACA bronze+HSA; varies by state, age, and income.

Sequence-of-returns risk — the biggest FIRE killer

• If markets drop 30% in the first 5 years of retirement, the 4% rule can break. Starting with a bear market is much worse than ending in one.
• Hedges: bond tent (more bonds around retirement year, less as it recedes), cash cushion (1-2 years spending), flexibility (cut spending in bear markets).
• A 60/40 or 70/30 portfolio historically withstood sequence risk better than 100% equities despite lower expected returns.

Roth conversion ladder for pre-59½ access

• Problem: most FIRE savers have their money in 401(k)/IRA — 10% early withdrawal penalty under IRC § 72(t) on distributions before 59½.
• Ladder mechanism: convert an amount equal to your annual spend from traditional IRA to Roth IRA each year. After the 5-year conversion holding period under IRC § 408A(d)(3)(F), those specific conversion amounts can be withdrawn penalty-free.⁴
• Start the ladder 5 years before you'll need to tap retirement accounts. Requires 5 years of taxable-brokerage runway while the ladder fills.
• Each conversion adds to taxable income — coordinate with ACA MAGI phase-outs and (post-65) IRMAA brackets.
• Alternative: SEPP / 72(t)(2)(A)(iv) substantially-equal-periodic-payments election. Locks you into a fixed schedule for 5 years or until 59½.

Social Security at 62, 67, or 70 — matters less in FIRE than traditional retirement

• Delaying to 70 increases monthly benefit ~77% over taking at 62 (70% at 62 × Delayed Retirement Credits to 124% at 70).⁵
• For FIRE households, SS is a longevity hedge, not primary income — treat like an inflation-adjusted lifetime annuity.
• If you have 10+ years left when you claim, delay unless health is poor or spouse is significantly lower-earning.

Sources

1. Bengen — Determining Withdrawal Rates Using Historical Data (1994). Original 4% rule.
2. Kitces — SWR by Retirement Horizon. 40+ year horizons require 3.25-3.5%.
3. IRC § 36B — Premium Tax Credit (ACA Subsidy). Enhanced subsidies under IRA (2022) expire end of 2025 absent further action.
4. IRC § 408A(d)(3)(F) — Roth IRA 5-Year Conversion Rule.
5. SSA — Claim Age Reductions and Delayed Retirement Credits.
6. IRC § 72(t) — 10% Early Withdrawal Penalty and Exceptions (including 72(t)(2)(A)(iv) SEPP).

Early retirement adds 10-20 years of portfolio stress beyond traditional retirement. ACA subsidy rules may shift in 2026+ — verify current year before committing to ACA-dependent FIRE plans.