By Harry Prabandham · Updated September 27, 2026
Tax Planning
Roth Conversion Ladder: How It Works for Early Retirees
A Roth conversion ladder converts pre-tax IRA money to Roth each year; each conversion can be withdrawn penalty-free after five tax years.
Roth Conversion Ladder: How It Works for Early Retirees
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What is a Roth conversion ladder?
- It is a series of annual conversions from a traditional IRA or 401(k) to a Roth IRA, each of which becomes available penalty-free after five tax years.
- Each conversion is taxed as ordinary income in the year it happens, so low-income years are the usual target.
- Early retirees use it to reach pre-tax savings before 59½ without a 72(t) schedule.
- Years one through five need another funding source, such as taxable savings, Roth contributions, or cash.
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Full Guide
What is a Roth conversion ladder?
- It is a series of annual conversions from a traditional IRA or 401(k) to a Roth IRA, each of which becomes available penalty-free after five tax years.
- Each conversion is taxed as ordinary income in the year it happens, so low-income years are the usual target.
- Early retirees use it to reach pre-tax savings before 59½ without a 72(t) schedule.
- Years one through five need another funding source, such as taxable savings, Roth contributions, or cash.
How does the five-year rule work for conversions?
- Each conversion has its own five-year clock that starts January 1 of the conversion year.
- Before 59½, withdrawing a conversion's taxable portion within five years triggers the 10% additional tax.
- Withdrawals come out in set order: contributions, then conversions oldest first, then earnings.
- After 59½ the per-conversion clock no longer matters for the penalty, but earnings are tax-free only once a Roth has been open five years.
Sizing annual conversions
- For 2026, the $32,200 joint standard deduction means a couple with no other income can convert that much before owing federal income tax.
- The 2026 12% bracket runs to $100,800 of taxable income for joint filers and $50,400 for single filers, a common fill-to level.
- Conversion income raises MAGI, which can reduce ACA premium tax credits, now ending at 400% of the poverty level, and push gains out of the 0% bracket.
- Conversions cannot be undone, since recharacterization was repealed in 2018.
How does the pro-rata rule affect conversions?
- If you hold both pre-tax and after-tax (nondeductible) IRA money, each conversion is taxed pro-rata across all your traditional, SEP, and SIMPLE IRAs.
- The calculation uses combined year-end IRA balances, so you cannot convert only the after-tax dollars.
- Rolling pre-tax IRA money into an employer plan that accepts roll-ins can isolate after-tax basis, if the plan allows it.
- Form 8606 tracks basis; confirm the math with a CPA before converting.
How do IRMAA and state taxes change the math?
- Medicare premiums use income from two years earlier, so 2026 IRMAA surcharges start above $109,000 single or $218,000 joint of 2024 MAGI.
- The 2026 standard Part B premium is $202.90 a month, and higher tiers add surcharges to Part B and Part D for each enrolled spouse.
- Conversions made from age 63 onward can therefore affect Medicare costs.
- States tax conversions differently; California taxes them as ordinary income, so the state of residence in conversion years matters.
Situations where a ladder tends to fit
- It tends to fit when there are several low-income years before Social Security, RMDs at 73 or 75, or a pension begins.
- It fits less well when conversion tax would be paid from the IRA itself, which reduces the amount moving to Roth.
- Large pre-tax balances, heirs in high brackets, and a surviving spouse filing single can all raise future tax rates on pre-tax money.
- Future tax law is uncertain, so conversions trade a known tax today for an estimate of tomorrow's.
Key takeaways
- Start conversions at least five years before you need the money, and fund the gap years from other sources.
- Size conversions against 2026 brackets, the ACA subsidy cliff, and IRMAA thresholds together, not in isolation.
- Check for pro-rata exposure if any IRA holds after-tax basis.
- Model a multi-year plan with a CPA; Rubric does not prepare tax returns.
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