Roth Conversion Ladder Calculator
Plan your 5-year Roth conversion ladder: see how converting a fixed amount from traditional to Roth each year builds tax-free savings and when each converted tranche becomes accessible penalty-free.
Roth balance after conversion ladder
$1,344,403
Traditional remaining: $123,065. Total tax paid: $165,000.
Final traditional balance
$123,065
Final Roth balance
$1,344,403
Accessible Roth (yr end)
$1,036,738
Total tax paid
$165,000
Ladder fully accessible
Year 20
Roth overtakes trad
Year 7
- 5-year rule on conversions: Each year's converted amount can be withdrawn from Roth tax-free and penalty-free exactly 5 years after the conversion year. This is separate from the 5-year rule on Roth account earnings. The "accessible Roth" line shows the penalty-free portion.
- Tax is assumed to be paid from external cash, not from the converted amount. Paying tax from the Roth would reduce the Roth balance and is not modeled here.
- The conversion amount is capped at the remaining traditional balance each year. Once the traditional account is depleted, no further conversions occur.
- A flat tax rate is applied every year. In practice, as the traditional balance shrinks and the conversion is the main taxable income, you may be able to optimize by targeting the top of a specific tax bracket each year.
- No Required Minimum Distributions (RMDs) are modeled. Traditional IRAs require RMDs starting at age 73. If you are past 73, the conversion may be constrained by the RMD rules.
- Returns are nominal (not inflation-adjusted) and assumed constant. Both accounts earn the same rate.
What is a Roth conversion ladder?
A Roth conversion ladder is a strategy that lets you access retirement funds before age 59½ without the 10% early withdrawal penalty. The basic idea: each year, convert a chunk of money from your traditional IRA or 401(k) to a Roth IRA. After 5 years, each converted amount becomes available penalty-free. By converting a new amount each year, you build a "ladder" of funds that become accessible one tranche at a time.
The key mechanism is the Roth 5-year rule: each conversion has its own independent 5-year clock. You can withdraw converted contributions (not earnings) from a Roth IRA at any time, tax- and penalty-free, regardless of age. The conversion ladder leverages this by converting incrementally and accessing each tranche as its 5-year clock expires.
Why it matters to your money
The Roth conversion ladder is the primary tool for early retirees who want access to their retirement savings before 59½. Without it, most early retirees must either pay a 10% penalty on early withdrawals or use the "rule of 55" (only available if you left your job in or after the year you turned 55) or SEPP 72(t) rules (which lock you into a fixed withdrawal schedule). The Roth ladder avoids all of these restrictions — but requires careful planning around tax brackets.
Read the full explainer on backdoor Roth strategies for more context on Roth conversions, tax implications, and the pro-rata rule that can affect people with pre-tax IRA balances.
Rules of thumb
- Stay within your tax bracket: Each conversion is taxed as ordinary income. Plan your conversion amounts to fill up your current tax bracket without pushing into the next one.
- Best for low-income years: The ideal conversion window is when you have low taxable income — between retiring and starting Social Security (typically ages 55–65).
- Wait 5 years per tranche: Each converted amount must age 5 years before it's penalty-free. Plan your ladder with this timeline in mind — a 10-year ladder takes 10 years of conversions plus 5 years for the first tranche to open.
Frequently asked questions
- What is a Roth conversion ladder?
- A Roth conversion ladder is a strategy for early retirees: you convert traditional IRA or 401k funds to Roth each year, then wait 5 years to withdraw those converted funds tax- and penalty-free. This creates a "ladder" of funds accessible before age 59½.
- Why wait 5 years after a Roth conversion?
- Each Roth conversion has its own 5-year clock. Withdrawing converted funds before 5 years triggers a 10% penalty (though not income tax — you already paid that). After 5 years, converted funds can be withdrawn completely tax- and penalty-free.
- When does a Roth conversion ladder make sense?
- It's most powerful for early retirees (FIRE) who have low-income years to convert at reduced tax rates, before Social Security and Required Minimum Distributions push them into higher brackets. The ideal window is typically ages 55–65.