Roth Conversion Ladder (May 2026)
The FIRE strategy for accessing 401(k) money tax-free before age 59½. Each conversion has its own 5-year clock. Fill the 12% bracket ($100,800 MFJ / $50,400 single). Watch the IRMAA Medicare trap.
You need a 5-year cash bridge to start the ladder
The first conversion isn't accessible for 5 years. You need 5 years of living expenses from non-Roth sources (taxable brokerage, existing Roth IRA contributions, HYSAs, CDs) to bridge years 1-5. Most FIRE practitioners build this bridge while still working, before starting the ladder.
Quick Answer
- What it is: stair-stepped Roth conversions over 5+ years that create a tax-free withdrawal pipeline starting in year 5.
- 5-year rule: each conversion has its own independent 5-year clock. Clock starts Jan 1 of the conversion tax year.
- Optimal conversion size: fill the 12% federal tax bracket ($100,800 MFJ / $50,400 single in 2026). ~6-8% effective rate after standard deduction.
- No annual conversion limit: unlike contributions ($7,500), conversions have no dollar cap.
- IRMAA Medicare trap: exceeding $109K single / $218K MFJ MAGI triggers Medicare premium surcharges 2 years later.
- Best for: FIRE practitioners (early retirees) ages 45-58 with significant pre-tax 401(k)/IRA balances.
- Worst for: active full-time workers at peak income (do Backdoor Roth instead).
The Ladder Timeline (Worked Example)
Married couple, retire end of 2025 at age 50, $1M in Traditional IRA, $300K taxable bridge fund. Convert $50,000/year for the full 12% bracket fill. By 2031 (year 5), the first conversion is accessible — and a new $50K becomes available every year thereafter.
| Tax year | Action | Access date | Tax cost |
|---|---|---|---|
| 2026 (Year 0) | Convert $50K from Traditional IRA → Roth IRA | Locked until Jan 1, 2031 | Pay ordinary income tax on $50K (target 12% bracket) |
| 2027 (Year 1) | Convert another $50K | Locked until Jan 1, 2032 | Pay ordinary income tax on $50K |
| 2028 (Year 2) | Convert another $50K | Locked until Jan 1, 2033 | Pay ordinary income tax on $50K |
| 2029 (Year 3) | Convert another $50K | Locked until Jan 1, 2034 | Pay ordinary income tax on $50K |
| 2030 (Year 4) | Convert another $50K | Locked until Jan 1, 2035 | Pay ordinary income tax on $50K |
| 2031 (Year 5+) | First $50K conversion now accessible. Continue annual conversions. | $50K available + new $50K/yr available 5 yrs after conversion | Sustainable tax-free withdrawal stream begins |
2026 Tax Brackets — Conversion Sizing Targets
Most FIRE practitioners size conversions to fill the 12% federal bracket and stop. Going into the 22% bracket usually costs more than leaving the money pre-tax for later.
| Bracket / threshold | Single tops at | MFJ tops at | Note |
|---|---|---|---|
| 10% bracket (lowest) | $11,925 | $23,850 | Ultra-low-income years. Typical FIRE first year retired with no other income. |
| 12% bracket (sweet spot) | $50,400 | $100,800 | Standard FIRE conversion target. ~6-8% effective rate after standard deduction. |
| 22% bracket | $103,350 | $206,700 | Above the 12% bracket — most FIRE practitioners avoid going here. |
| IRMAA Tier 1 trigger (Medicare premium surcharge) | $109,000 | $218,000 | Modified AGI threshold. Look-back is 2 years (2026 conversions affect 2028 Medicare). |
12% bracket row highlighted as the typical FIRE conversion target. IRMAA threshold highlighted as the Medicare trap to avoid.
3 Bridge Sources for Years 1-5
1. Taxable brokerage
Sell long-term-capital-gains positions for income. Up to $96,700 MFJ at 0% federal LTCG rate (2026). Pair with conversions strategically — too much LTCG income may push conversions into 22% bracket.
2. Existing Roth IRA contributions
Direct Roth IRA contributions (NOT conversions) can be withdrawn anytime tax-free, regardless of age. If you've been contributing $7K/yr for 15+ years, you have $100K+ accessible immediately.
3. HYSAs / CDs / T-bills
Standard FIRE plan: hold 3-5 years of living expenses in 4%+ HYSAs (Marcus 3.50%, Synchrony 3.50%) or CDs (Marcus 9-mo 4.05%). Provides cash flow during ladder ramp-up.
Should you build a Roth conversion ladder?
Match your situation:
- FIRE-aspiring, age 45-55, $500K+ in pre-tax 401(k)/IRA→ Plan ladder; build 5-year bridge firstOptimal use case. Convert during low-income FIRE years to drain pre-tax balances at 12% rate.
- Already retired, age 55+, no Social Security yet→ Convert aggressively to fill 12% bracketPre-Social-Security years are golden conversion windows. Income is otherwise very low.
- Active full-time worker, age 30-50→ Skip ladder; do Backdoor Roth + max 401(k)Conversion at peak salary = 22-32% rate, much worse than just contributing Roth where possible.
- Approaching age 73 (RMD trigger)→ Aggressive conversions in 60s before RMD locks inOnce RMDs start at 73, you must withdraw whether you want to or not. Convert pre-RMD to manage tax burden.
- Worried about Medicare IRMAA surcharges→ Size conversions just below IRMAA threshold$109K single / $218K MFJ MAGI ceiling. Above adds Medicare Parts B+D surcharges 2 years later.
- Have Roth 401(k) at work + Traditional IRA→ Convert Traditional IRA, leave Roth 401(k) aloneRoth 401(k) is already after-tax; no conversion needed. Focus on the pre-tax balances.
- Pre-tax IRA balance triggers Backdoor Roth pro-rata→ Convert pre-tax IRA in one big year, take the tax hitSometimes worth absorbing one big tax year to clear the field for ongoing Backdoor Roth efficiency.
Frequently Asked Questions
How we verified this
Strategy mechanics verified May 2026 against IRS Publication 590-A (Distributions from IRAs), NerdWallet 2026 Roth conversion ladder guide, ChooseFI 2026 conversion ladder explainer, The College Investor 2026 ladder breakdown, Wealthvieu 2026 Roth ladder analysis, EnoughMoney.ai FIRE bridge strategy, and SDO CPA 2026 Roth conversion strategies. Tax bracket figures per IRS Rev. Proc. 2025-32 (2026 tax tables). IRMAA thresholds per CMS 2026 announcement. 5-year rule per IRC §408A(d)(3)(F).